[JIM68]

i just wanted to see what static and dynamic compression ratios you guys with camelhumps are running, and also what intake valve closings your camshafts are at....

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1968 Coupe, 327/210hp project in process. PS/PB, Factory AC, adding camelhumps and a CompCam XE262
1986 Chevy Stepside, dying 4.3L, TH-400, no A/C, 2wd, 1/4 million miles.

[pdq67]

Let's see... Isn't about 9.75 to 1CR. about the limit with the old heads guy's??? Unless you want to really play with your combination... pdq67

[JIM68]

i made a dynamic compression calculator using Excel.... the file is here
email me if you would rather me email it to you... file size is 274k, or i can zip it up.

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1968 Coupe, 327/210hp project in process. PS/PB, Factory AC, adding camelhumps and a CompCam XE262
1986 Chevy Stepside, dying 4.3L, TH-400, no A/C, 2wd, 1/4 million miles.

[This message has been edited by JIM68 (edited 01-13-2003).]

[pdq67]

Great on the DCR thing!!!

Now there are two, your's and Pat Kelley's!!! pdq67

[JIM68]

thanks pdq67,
mine matchs Pats exactly if you enter zeros for the piston to wall clearance and the top ring land height.



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1968 Coupe, 327/210hp project in process. PS/PB, Factory AC, adding camelhumps and a CompCam XE262
1986 Chevy Stepside, dying 4.3L, TH-400, no A/C, 2wd, 1/4 million miles.

[Mark C]

Wow 12.62 static, 11.69 dynamic, 91.99% trapped cylinder volume and 3.201 inch dynamic stroke with this coming years pistons. Guess I'm looking at 93 octane or better.



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Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11
My 69 L48 - 350/300HP Engine

[MoeSS396]

It depends on the DCR. 7.5-1 with the old head design is all it wants on 91. I have heard many say the old 350HP 327 runs fine on 91 with the timing advanced. Thats a 290 duration cam and a 114LSA though, around 7.5-1 DCR.