just so i can under stand alot of my serches better., When folks refer to" fwd" heads? there talking about front wheel drive engine heads??is this correct,. if so do i just go to junk yard next time i do head gasketts and get the fwd im asumming would come from 4th gen's ., or would there be any neccessary mods/trimming?
Thanks in advance

 

4th gens are rear wheel drive, what are you talking about?

 

what i dint typ clear enough? im basicaly trying to find out what fwd heads are!

 

Minivan heads

 

cars that spin the front tires not the rear i.e. civics,integras. F.W.D. = Front Wheel Drive

 

ok so what im hearing is folks are using mini van heads .,,. as replacements for our v6 stock ones .,,. or am i just gittin the run around here??

 

yes. They flow better, but require you change to FWD pistons to compensate for the reduced chamber size.

 

you dont have to change the pistons you just have to compensate for the compression with a tune... and im guessing if you have a 91.. its a 3.1 so if you toss on say some aluminum heads off a grand prix or grand am... lumina base car or yes even some minivans your gonna get a better flowing head... nothing huge ive seen the same flow rate out of a good set of pnp rwd heads but i guess you wouldnt have to do the work when you swap it..and then you could also pnp out the aluminum heads for even better performance... the only thing you have to be careful about is the intake setup on the heads most wont be a probelm but there are 3 or maybe even 4 now differnt generations of the 60 degree v-6 motors.. the 2.8 3.1 3.4 3100 3400 3900 these are all the same block basically just different bores and strokes and sometimes different bolt patterns here is a good site to get you started

- Forum

they know alot of the tricks and different combos of all these generations to get the best outta that v6... just do some research and make sure you have the right one to swap onto it.. otherwise your just wasting money..

 

There are 3 generations.

Unless you know something that other people don't about running a 12:1 static compression engine, I'm all ears. Yes, it can be done, but most here don't want to run C10+ on a daily basis.

Best bet is to swap to FWD pistons, to drop the SCR to 8.9:1 using a 3.1 piston from a generationII 3.1, with matching stroke. Or really retaining the 2.8 stroke, you could use genII 2.8 pistons and get 8.9:1.
Now going for slightly more SCR, you could use the 3100 or 3400 (if you have a 3.4) pistons, to bring it up to 9.6:1, which is what I would recommend, seeing as a higher compression engine will burn more efficiantly, and be more drivable than a lower compression engine.

Once I get to working on my Jimmy again, I'll be swapping to .039" compressed head gaskets bringing the SCR toi about 9.3:1, using the genII 3.1 pistons, and 3400 heads, which will make the 10 to 12 PSI from the turbos quite fun.

 

Thanks wezseles and six shooter., you knew exactly what i wanted to know i appritiate the help, and understanding, slowly but surely ive been learning so much here on this forum.,,.some times its difficult cause folks act like im already supposed to know these things,.but im gettin there,.i now have a better understanding,. an for that im gratful.,
So does better flow also mean it would sound a lil diff?
like a more steady idel? or any increase in hp?