3.1 heads on a 3.4?

[FuZE01]

a friend of mine who knows a good bit about cars, told me he heard that you could put heads from a 3.1 on a 3.4 and it would boost the hp. although he didnt know if his source was correct i decided to ask the gooroos (that means you people) if this was correct and if you knew how to do it. we thought you would have to change the timing and all that jazz too?

any takers?

[vanbibber]

Re: 3.1 heads on a 3.4?

its more involved than just swapping heads.

http://forum.camarov6.com/showthread.php?t=64963

[Mighty Thor]

Re: 3.1 heads on a 3.4?

3.4 is just a totally different engine eventhough they are 60* just like the 2.8 and 3.1. I don't believe the heads would bolt up.

Here's a good history of GM's 60* V6 engine from wiki

http://en.wikipedia.org/wiki/GM_60-Degree_V6_engine

[95astrovan]

Re: 3.1 heads on a 3.4?

yes, it is possible to do a 3.1 top end swap. you'll need 3.1 heads, UIM and LIM and fuel rails. the small boost doesnt come as much from the heads as the intake, which flows much better than the 3.4's UIM. everything bolts up, but you cant mix-match. gotta have the 3.1 intakes to use the 3.1 heads.

[3.4 slow to go]

Re: 3.1 heads on a 3.4?

he doesn't need the 3.1 LIM, 3.4 will work. iirc, the cold start injector was only w/teh 2.8 fuelies.
more importantly, which 3.1 heads are you talking about, iron or aluminum??????

[FuZE01]

Re: 3.1 heads on a 3.4?

thanks guys and definatly thanks to black34v6 for all that info! im kinda pissed that i found this out like 2 months too late i already bought the k&n intake for my car and i dont know if it will fit if i do change the heads and plenum

[FuZE01]

Re: 3.1 heads on a 3.4?

he doesn't need the 3.1 LIM, 3.4 will work. iirc, the cold start injector was only w/teh 2.8 fuelies.
more importantly, which 3.1 heads are you talking about, iron or aluminum??????

probably aluminum they weigh less

[3.4 slow to go]

Re: 3.1 heads on a 3.4?

for swapping in aluminum heads, read the link bibby posted.