Intlcutlass Posted November 1, 2002 Report Share Posted November 1, 2002 I have seen a lot of you post that you are using heads from a 3100 because they are better. Hell.....even Jeff M I think is using them. What are the differences? Do you have to modify anythink if i wanted to use heads from a 3100? If I use 3100 heads, would i still benifit from using proformance roller rocker arms, springs, and pushrods? Are the heads from a 3100 the same as a 3400?? Quote Link to comment Share on other sites More sharing options...
weisinator Posted November 1, 2002 Report Share Posted November 1, 2002 You have to use the whole 3100 top end: plenum, intake manifold, and exhaust manifolds if you want the heads. Ports don't line up with MPFI parts. The heads flow 17% better on the intake and 30% better on the exhaust, when compared to aluminum MPFI heads. The intake valve is 1.76" vs 1.72". Not sure about differences in plenum and manifolds, though. Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted November 1, 2002 Report Share Posted November 1, 2002 Personally, I feel like if you're changing the whole top half of the engine anyway, why not go ahead and change the bottom half too? The 3100 has a roller camshaft and the block is stiffer and better reinforced. Quote Link to comment Share on other sites More sharing options...
Intlcutlass Posted November 4, 2002 Author Report Share Posted November 4, 2002 That sounds like too much to change...... I will just get the ones i have Ported & polished. And Shawn brings up a good point too.....but I already have torn apart the bottom half of the motor and it looked really good. I just have to order the main bearings & some other stuff,....It's comin along. I just was not sure what would need to be changed.... Quote Link to comment Share on other sites More sharing options...
Brian P Posted November 4, 2002 Report Share Posted November 4, 2002 Good news is that if you keep the 3.1 bottom end, you can get a performance camshaft from GM for under $100...with the 3100 you have to get a stock one custom ground, which would be minimum $250+ Quote Link to comment Share on other sites More sharing options...
Intlcutlass Posted November 4, 2002 Author Report Share Posted November 4, 2002 Actually Brian, My brother-n-law and I got a quote from comp cams for $180.00 ....... Quote Link to comment Share on other sites More sharing options...
MaD Posted November 4, 2002 Report Share Posted November 4, 2002 ...That's still an $80 difference -MaD- Quote Link to comment Share on other sites More sharing options...
Brian P Posted November 4, 2002 Report Share Posted November 4, 2002 damn , $180 is good still Quote Link to comment Share on other sites More sharing options...
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