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XJ XJ8 / XJR ( X308 ) 1997 - 2003

XJR heads - same as N/A 4.0?

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Old 04-20-2011, 08:48 AM
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Default XJR heads - same as N/A 4.0?
Guys,

Looks like one of my heads has gone porus and I need to find a replacement, are they the same as the non-supercharged 4.0?
 
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Old 04-20-2011, 09:35 PM
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Here is some info on determining to compatibility for fitting the cylinder heads.

The Supercharged heads need to have the oil gallery plugged if the heads are from a normally aspirated or drilled out for fitting the SC heads to a NA engine.

bob gauff
 
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303-26 oil weep from head.pdf (39.5 KB, 118 views)
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303-31 VVT cylinder heads.pdf (42.7 KB, 158 views)
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Old 04-20-2011, 11:54 PM
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Originally Posted by motorcarman
The Supercharged heads need to have the oil gallery plugged if the heads are from a normally aspirated or drilled out for fitting the SC heads to a NA engine.

bob gauff
Those holes at the rear face of the cylinder head with the "dowty" plugs ... are they under full oil pressure? Looking for an alternate place to fit an additional oil pressure sender.
 
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