XJR heads - same as N/A 4.0?

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Apr 20, 2011 | 08:48 AM

Duke Thrust

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From: Gloucestershire

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?

Apr 20, 2011 | 09:35 PM

motorcarman

Joined: Dec 2009

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From: Wise County,TX

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

Attached Files

303-26 oil weep from head.pdf (39.5 KB, 136 views)

303-31 VVT cylinder heads.pdf (42.7 KB, 176 views)

Apr 20, 2011 | 11:54 PM

plums

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From: on-the-edge

Quote:

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.