383 12.5 to 1 compression?
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Junior Member
Joined: Oct 2009
Posts: 21
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From: Jasper, IN
Car: 1984 TA
Engine: 355 Carb
Transmission: 700r4 Built 2200 stall
Axle/Gears: 3.73
383 12.5 to 1 compression?
I have seen people running 12.5 to 1 with aluminum heads. Just wondering if it will work with 94 octane and a comp xfi 280hr. The compression ratio calculator said it would have about 197psi of cranking compression.
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 383 12.5 to 1 compression?
Have you done a DCR Calc ?
That is a better indication of whether it will knock
Download calc at bottom of page
http://members.uia.net/pkelley2/DynamicCR.html
That is a better indication of whether it will knock
Download calc at bottom of page
http://members.uia.net/pkelley2/DynamicCR.html
Thread Starter
Junior Member
Joined: Oct 2009
Posts: 21
Likes: 0
From: Jasper, IN
Car: 1984 TA
Engine: 355 Carb
Transmission: 700r4 Built 2200 stall
Axle/Gears: 3.73
Re: 383 12.5 to 1 compression?
I'm Just gonna mix 110 with it. I figure with about 100 octane I should be okay.
Joined: Sep 2009
Posts: 3,776
Likes: 101
From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
Re: 383 12.5 to 1 compression?
i know 12.1 is fine on the street with alum heads and a Good tune.
with 94 octane..and EFI.
remember EFI.Good Gas(94 and up). Good tune.. not putting 100 miles a day on it..
you should be fine..
with 94 octane..and EFI.
remember EFI.Good Gas(94 and up). Good tune.. not putting 100 miles a day on it..
you should be fine..
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