Question for engine experts

[JFP in PA]

If you think you have a cylinder head issue, try running a leak down and/or bore scoping the suspect.

You can interchange 3.2 and 3.4 cylinder heads within certain bounds and caveats: Both engines need to be 5 chain designs to allow this to happen as there were no 3 chain 3.4 engines. The 3.2 heads will increase the compression ratio a small amount due to their very slightly smaller chambers, and both use same camshafts. There is also some difference in the intake arrangement.

3.6 heads are not usable because of the VarioCam+ .

[BYprodriver]

Originally Posted by JFP in PA

If you think you have a cylinder head issue, try running a leak down and/or bore scoping the suspect.

You can interchange 3.2 and 3.4 cylinder heads within certain bounds and caveats: Both engines need to be 5 chain designs to allow this to happen as there were no 3 chain 3.4 engines. The 3.2 heads will increase the compression ratio a small amount due to their very slightly smaller chambers, and both use same camshafts. There is also some difference in the intake arrangement.

3.6 heads are not usable because of the VarioCam+ .

The heads are the same casting including the bolt hole bosses. Depending on application (3.4 or 3.2) holes are drilled & taped for bolt on accessories & combustion chambers are finished with 3cc's less volume for the 3.2L to maintain compression ratio Valvetrain is the same.

[BYprodriver]

Originally Posted by BYprodriver

The heads are the same casting including the bolt hole bosses. Depending on application (3.4 or 3.2) holes are drilled & taped for bolt on accessories & combustion chambers are finished with 3cc's less volume for the 3.2L to maintain compression ratio with smaller bore size. Valvetrain is the same.

(corrected post from original text)