Has anybody flowed the 4th gen 3.4 iron heads? Just wondering if they are any better than the 3.1 irons.

 

IIRC the 2.8 3.1 and 3.4 RWD blocks all used the same heads. the FWD 3400 had better flowing heads.

 

Just didn't know if the later model 60* iron heads had any changes to make them flow better. Didn't they switch to a d-port design? I know the AL heads are better, but you have to change the pistons to match. I'm looking to do a head swap and keep my bottom end.

 

I dont remember. some one else should chime in before the end of the weeked I bet though.

 

no D ports on the 93-95 3.4 iron heads