Who's Running 3.4 Pistons in a 3400?

[Badlands44]

I'm getting ready to build my 3400 in the next few months and I'm starting to get my parts together. I just ordered the 65mm TB, ported 3500 intake, and I'll also be running ported 3500 heads and a reground cam.

The lower end is a '96 3400 and I have been told that I can run 3.4L Camaro pistons and get close to 12:1 compression. I'd like to hear from some people who have run this set up to see how they like it. Does anyone have the exact numbers on what the CR would be with the 3500 heads?

[SappySE107]

It will be a little lower using 3500 heads. I haven't cced any so I can't tell you what the exact compression will be. I am using 3.4 DOHC pistons ina 3400 build using 3500 top end. That should be higher compression than the 3.4 camaro pistons. 91-95 pistons have about 4.5cc total. Not sure on the 96 pistons because of the deepe valve relief cuts but added .040 dome in the middle.

[sharkey]

any chance you will be ccing a 3500 head anytime soon???

[onefastV6]

With my 3500 heads milled .020" Ben measured the combustion chamber to be 32.4 CC's.

[torq455]

i thought they were 30 cc's

[SappySE107]

Stock is 32.4ccs.

[sharkey]

excelent. i figure on my motor (3.530 bore, 9.3:1 compression with 48cc ironheads) will end up at 11.6:1 with 3500 heads and .062 head gaskets. still able to run 91 with proper tuning at that compression.

i may just have a new winter project.

[SappySE107]

Do you have flat top pistons?

[Badlands44]

It will be a little lower using 3500 heads. I haven't cced any so I can't tell you what the exact compression will be. I am using 3.4 DOHC pistons ina 3400 build using 3500 top end. That should be higher compression than the 3.4 camaro pistons. 91-95 pistons have about 4.5cc total. Not sure on the 96 pistons because of the deepe valve relief cuts but added .040 dome in the middle.

What did you figure your CR will be with the 3400 you mentioned?

[SappySE107]

I don't know for sure because of the .040 dome. I don't have any easy way of measuring for that.

91-95 3.4 DOHC - 9.25:1 with 54cc head and ~4.5 cc piston
96-97 3.4 DOHC - 9.7:1 with 51.5cc head and x cc piston.

I figure it should be near 12:1.

[sharkey]

my pistons are flat tops. i know an ironhead motor with 91-95 3.4l dohc pistons ends up at around 9.8:1.

from all my mesuarments i took when i built my motor, and now figuring in the thicker (gen 2 or 3) headgaskets and the 32.4cc combustion chamber, i end up at 11.6:1 with desktop dyno.