89 Xjs convertible v12 chevy convertion
#21
Well im purchasing a rebuilt 350 to replace this one... save me time and $ afterwards ill replace most of the hoses since this guy had overheating and theyre all ugly now.
Also is it ok to replace harmonic balancer or if it looks decent leave it. ?.
It is carb
Has a rochester right now...I guess for gas saving purposes
Has a rochester right now...I guess for gas saving purposes
If you have a SMC in there already and replacing it with the same its its definetly going to be the cost effective, next option find an LS, if you want V12 go and buy another car with one in it will be so much easier and cheaper.
As far as your seats go i don't know what's a good price or not, It all depends on how badly you want those seats and if the seller knows how badly you want them, sometimes you get get the whole car cheaper than that you just need to search for them.
Good luck
#22
Good advice here. The shallow first gear on the 3-speed GM transmissions plus the 2.88 rear gear doesn't do your engine any favors. If you're buying a crate engine, consider getting a beautiful reman'd complete 383 off eBay for around $3,000. My brother did this for his old Nova. They're worth the money. There's more low-end torque than he knows what to do with!
#23
Beauty is in the eye of the beholder so see it before you buy it. Everyone's different but for me red interior gets old fast. It looks great at a car show in a Corvette, Porsche, Jag, etc...but not so much for a daily driver. Some people perceive the color red as a powerful stimulator and find it enticing so after awhile it can become an irritant.
Last edited by icsamerica; 05-14-2014 at 10:07 AM.
#24
i guess if youre into blocks that have their own gravitational field, a qaudrajunk in which you can have a choke or a throttle but not both, the fuel economy of a 13b, and the power curve of a Honda D series then SBC is the motor for you my friend!
#25
The fully dressed SBC tips the scale at about 500lbs, the buick V6 with 2 less cylinders just 400lbs. That would be a displacement to weight ratio of 1.14:1 for the 5.7l for the SBC and just 0.95:1 for the 3.8l buick so minor advantage for SBC. The SBC recieved its first optional Fuel injection system in 1955. Around 1984 fuel injection was widely available and mostly standard for both the SBC and the Buick 3800... Prior to 1984 both the Buick and SBC used GM's Rochester Carburetor family. You do know that they are both made by GM and are very similar in design, oiling, valve arrangement and metallurgy...right? Were you aware both the SBC and the Buick v6 were often manufactured side by side at GM's engine plants like Tonawanda. As for fuel economy, the SBC is a large engine, as such it is less fuel efficient but there were many economy SBC versions. One was as small as 4.3L and were efficient enough to be NYC cabs at the time.
#27
I don't know where you stand here m90, but I am not a fan of big engines (in that way) . I think they can be engineering marvels and masterpieces (like the 8l bentley) but the "no replacement for displacement" elementary school drivel associated with small clock chevys and fords is idiotic.
The sbc is pretty lazily engineered and the only reason Im okay with the small block buick in my Land rover is because it is all aluminum (something GM hadn't the mind to figure out, even in their sports cars)
In terms of creating something the sbc is just an easy answer because it has so much aftermarket. It terms of an engine there are many more lighter and just as powerful and many the same size and more efficient. You don't see Miata drivers putting Mg 1800s in their cars, why are we dropping sbcs into everything?
Forced induction overcomes displacement by a landslide. There very much is a replacement for displacement.
I think the sbc has retained its use and popularity because it is so dated. It easy for shade trees to wrap their minds around a pushrod engine, and they find comfort in it. Then they go on to perpetuate it being "badass" to have cars that can't turn and create 400hp unstreetable uncomfortable hp with a 6 liter engine. It is sad that the vast majority of the car crowd belittles others for appreciating more complex engineering and more efficient engines.
Last edited by sidescrollin; 05-15-2014 at 11:44 AM.
#28
^^ i agree wholeheartedly ^^
my point about the displacement to weight ratio is that im pretty sure hes a decimal place or two off.
my beef with the SBC is that the only thing they offer is aftermarket support. they dont sound good, they dont run good, the archaic fuel injection that was available through the 80's was complete garbage in TBI form, and just as guttless in tune port. distributor ignition isnt awful, i guess, if you dont care about having temp and knock based timing curves......
the argument that some SBC's are built for economy and some are built for power..... so you can have one or the other but not both? how does the fact that a 4.3 which is slightly more economic than the 5.7 support the argument for putting a big 350 in a jag? and i dont think taking a 100bhp hit on your motor swap makes sense (sure there are performance parts available, but that argument goes for both engines). my little buick v6 with "two less cylinders" (as ive been repeatedly told) is already up on power over the SBC in Naturally Aspirated form!
but enough about that. there are definitely better 6 and 4 cylinder platforms out there, but i enjoy my little buick 6 cylinders. easy on fuel and 14psi of boost when my foot is feeling heavy.
my point about the displacement to weight ratio is that im pretty sure hes a decimal place or two off.
my beef with the SBC is that the only thing they offer is aftermarket support. they dont sound good, they dont run good, the archaic fuel injection that was available through the 80's was complete garbage in TBI form, and just as guttless in tune port. distributor ignition isnt awful, i guess, if you dont care about having temp and knock based timing curves......
the argument that some SBC's are built for economy and some are built for power..... so you can have one or the other but not both? how does the fact that a 4.3 which is slightly more economic than the 5.7 support the argument for putting a big 350 in a jag? and i dont think taking a 100bhp hit on your motor swap makes sense (sure there are performance parts available, but that argument goes for both engines). my little buick v6 with "two less cylinders" (as ive been repeatedly told) is already up on power over the SBC in Naturally Aspirated form!
but enough about that. there are definitely better 6 and 4 cylinder platforms out there, but i enjoy my little buick 6 cylinders. easy on fuel and 14psi of boost when my foot is feeling heavy.
#29
Yeah I think he is saying the sbc weighs X more but has y more displacement.
I don't know where you stand here m90, but I am not a fan of big engines (in that way) . I think they can be engineering marvels and masterpieces (like the 8l bentley) but the "no replacement for displacement" elementary school drivel associated with small clock chevys and fords is idiotic.
The sbc is pretty lazily engineered and the only reason Im okay with the small block buick in my Land rover is because it is all aluminum (something GM hadn't the mind to figure out, even in their sports cars)
I don't know where you stand here m90, but I am not a fan of big engines (in that way) . I think they can be engineering marvels and masterpieces (like the 8l bentley) but the "no replacement for displacement" elementary school drivel associated with small clock chevys and fords is idiotic.
The sbc is pretty lazily engineered and the only reason Im okay with the small block buick in my Land rover is because it is all aluminum (something GM hadn't the mind to figure out, even in their sports cars)
The Rover V8 in your landi is based on the Buick 215 which was Aluminum and available in production GM cars for the 1961 model year. In any case whats your point? Other non GM marques like BMW & Mercedes and others used iron blocks well in to the 2000's
Although cliché there is no displacement for displacement except for forced induction which effectively increases displacement. If there was a replacement for it many racing series wouldn't need displacement rules. There are many ways to get to a given level of performance, sometimes its using displacement. Nothing wrong or lazy about it.
In terms of creating something the sbc is just an easy answer because it has so much aftermarket. It terms of an engine there are many more lighter and just as powerful and many the same size and more efficient. You don't see Miata drivers putting Mg 1800s in their cars, why are we dropping sbcs into everything?
I think the sbc has retained its use and popularity because it is so dated. It easy for shade trees to wrap their minds around a pushrod engine, and they find comfort in it. Then they go on to perpetuate it being "badass" to have cars that can't turn and create 400hp unstreetable uncomfortable hp with a 6 liter engine. It is sad that the vast majority of the car crowd belittles others for appreciating more complex engineering and more efficient engines.
Who is belittling complex engineering and how? Most people would agree complexity with out performance is less valuable or less useful than simplicity with performance. The whole point of engineering is to achieve a specific level of performance with the least complexity and cost. Some people, companies, engineers, etc are better at it than others. The opposite is a Rube Goldberg project, some people like those too. If you're into that than good for you, it doesn't mean something simple yet effective is junk.
Last edited by icsamerica; 05-15-2014 at 06:35 PM.
#30
If it were me..... I would go bbc 427 all the way. It's my favorite motor. Having spent much time around them. I like the sound and power curve.
I almost did this swap untill I factored in the cost of getting and rebuilding the motor and all the parts required to reconnect the drive train I had converted to manual.
Then I bought the v12 that icsamerica mentioned in his video that came out of his xj12c.
Nothing wrong with the v8 swap especially since bbc and sbc are probably the two most researched and modified motors in the world. And you can make any amount of power from 300-3000hp with the right formula
I almost did this swap untill I factored in the cost of getting and rebuilding the motor and all the parts required to reconnect the drive train I had converted to manual.
Then I bought the v12 that icsamerica mentioned in his video that came out of his xj12c.
Nothing wrong with the v8 swap especially since bbc and sbc are probably the two most researched and modified motors in the world. And you can make any amount of power from 300-3000hp with the right formula
#31
The SBC and the L67 were good in their time and properly setup, each one can be good now. It really depends on what you like and what you want. However, neither of them can possibly compare with today's technology.
Get rid for your old-a$$ engines and get an LS! For the money they cannot be beat. You'll get aluminum or iron block options, great engine management software, excellent aftermarket support, and a better torque/horsepower/economy/refinement balance than you can squeeze out of any engine platform today without breaking the bank. Period.
Forced induction is your thing? No problem. They do that too. There are off the shelf supercharger kits that will take you up to 650+ hp with a torque curve like a tabletop. There are plenty of vehicle-specific turbo kits for both cars and trucks. Want to go the OEM route? You can retrofit a CTS-V or ZR-1 supercharger onto your LS engine with all factory parts. They do it all. That's why people swap LS engines into more vehicles than you'd imagine!
Get rid for your old-a$$ engines and get an LS! For the money they cannot be beat. You'll get aluminum or iron block options, great engine management software, excellent aftermarket support, and a better torque/horsepower/economy/refinement balance than you can squeeze out of any engine platform today without breaking the bank. Period.
Forced induction is your thing? No problem. They do that too. There are off the shelf supercharger kits that will take you up to 650+ hp with a torque curve like a tabletop. There are plenty of vehicle-specific turbo kits for both cars and trucks. Want to go the OEM route? You can retrofit a CTS-V or ZR-1 supercharger onto your LS engine with all factory parts. They do it all. That's why people swap LS engines into more vehicles than you'd imagine!
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icsamerica (05-15-2014)
#32
^^ i agree wholeheartedly ^^
my point about the displacement to weight ratio is that im pretty sure hes a decimal place or two off.
my beef with the SBC is that the only thing they offer is aftermarket support. they dont sound good, they dont run good, the archaic fuel injection that was available through the 80's was complete garbage in TBI form, and just as guttless in tune port. distributor ignition isnt awful, i guess, if you dont care about having temp and knock based timing curves......
the argument that some SBC's are built for economy and some are built for power..... so you can have one or the other but not both? how does the fact that a 4.3 which is slightly more economic than the 5.7 support the argument for putting a big 350 in a jag? and i dont think taking a 100bhp hit on your motor swap makes sense (sure there are performance parts available, but that argument goes for both engines). my little buick v6 with "two less cylinders" (as ive been repeatedly told) is already up on power over the SBC in Naturally Aspirated form!
but enough about that. there are definitely better 6 and 4 cylinder platforms out there, but i enjoy my little buick 6 cylinders. easy on fuel and 14psi of boost when my foot is feeling heavy.
my point about the displacement to weight ratio is that im pretty sure hes a decimal place or two off.
my beef with the SBC is that the only thing they offer is aftermarket support. they dont sound good, they dont run good, the archaic fuel injection that was available through the 80's was complete garbage in TBI form, and just as guttless in tune port. distributor ignition isnt awful, i guess, if you dont care about having temp and knock based timing curves......
the argument that some SBC's are built for economy and some are built for power..... so you can have one or the other but not both? how does the fact that a 4.3 which is slightly more economic than the 5.7 support the argument for putting a big 350 in a jag? and i dont think taking a 100bhp hit on your motor swap makes sense (sure there are performance parts available, but that argument goes for both engines). my little buick v6 with "two less cylinders" (as ive been repeatedly told) is already up on power over the SBC in Naturally Aspirated form!
but enough about that. there are definitely better 6 and 4 cylinder platforms out there, but i enjoy my little buick 6 cylinders. easy on fuel and 14psi of boost when my foot is feeling heavy.
I really don't get the concept of SBC bashing. Doesn't make sense to me and seems a bit rigid. My engine mods are OK and yours are junk? WTF! Doesn't seem right to me.
https://www.jaguarforums.com/forum/x...14/#post957601
#33
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Ahhh, [sigh] I remember the old days when 'lumping' debates were simply a matter of Jaguar engines vs. American V8 engine. Now it's down to debating *which* American engine ! Gah!
As for old school SBCs being, well, old school, it doesn't seem altogether unfitting to use 'em in old Jags....which are pretty old school themselves !
You guys can duke it out but I can find something to like in all the engines mentioned in this thread, including the Jag engines !
Cheers
DD
As for old school SBCs being, well, old school, it doesn't seem altogether unfitting to use 'em in old Jags....which are pretty old school themselves !
You guys can duke it out but I can find something to like in all the engines mentioned in this thread, including the Jag engines !
Cheers
DD
#37
I really don't get the concept of SBC bashing. Doesn't make sense to me and seems a bit rigid. My engine mods are OK and yours are junk? WTF! Doesn't seem right to me.
https://www.jaguarforums.com/forum/x...14/#post957601
https://www.jaguarforums.com/forum/x...14/#post957601
#38
As for what I've posted about the V12...What exactly are you referring to? I've posted quite a bit but as for my criticism of it...I'm just pointing out the obvious and talking from experience. If I posted something wrong or inaccurate point it out. I've never criticized someones choice to keep it but post in response to those who rigidly oppose the SBC swap. The rest of the posts here from others and their challenges with the V12 as originally designed speaks for itself. If you like your V12 you should keep your v12, if you don't for some reason and you choose an alternative the choice shouldn't be criticized strictly because its a SBC.
Last edited by icsamerica; 05-17-2014 at 11:05 AM.
#39
update
Ok so now I have the hood off.scrapping off the doodoo shield
I have the new motor.. it is a 84 Corvette block. Edel brock intake
I need to purchase a diagonal thermostat housing -----Tips?
Will need a new Carb... nothing crazy ---Tips?
Will be getting rustoleum for the hood primer and high heat... should I still find a shield or is it not a necessity?
and I have the 1-2-1 headers ....should I keep or do pipes... ?
Also as a sidenote Im replacing small hardware in the engine bay with stainless steel . No more rust bolts ! Sponsored by Fastenal
I have the new motor.. it is a 84 Corvette block. Edel brock intake
I need to purchase a diagonal thermostat housing -----Tips?
Will need a new Carb... nothing crazy ---Tips?
Will be getting rustoleum for the hood primer and high heat... should I still find a shield or is it not a necessity?
and I have the 1-2-1 headers ....should I keep or do pipes... ?
Also as a sidenote Im replacing small hardware in the engine bay with stainless steel . No more rust bolts ! Sponsored by Fastenal
#40
Ok so now I have the hood off.scrapping off the doodoo shield
I have the new motor.. it is a 84 Corvette block. Edel brock intake
I need to purchase a diagonal thermostat housing -----Tips?
Will need a new Carb... nothing crazy ---Tips?
I have the new motor.. it is a 84 Corvette block. Edel brock intake
I need to purchase a diagonal thermostat housing -----Tips?
Will need a new Carb... nothing crazy ---Tips?
Will be getting rustoleum for the hood primer and high heat... should I still find a shield or is it not a necessity?
and I have the 1-2-1 headers ....should I keep or do pipes... ?
Also as a sidenote Im replacing small hardware in the engine bay with stainless steel . No more rust bolts ! Sponsored by Fastenal