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04-14-2012, 10:41:22 PM
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#1
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New Member
Join Date: Jul 2011
Location: Albuquerque, NM
Posts: 24
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Compression Ratio question
Hello, I have a 350 in my '74 Z28, it has 64cc heads, and I can only assume it has flat top pistons. I was wondering if anyone could help me out on ball park of a compression ratio it might be pulling. The head casting numbers are 14096217 and the block is 10243880. Thanks for any help.
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04-15-2012, 12:03:23 AM
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#2
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Veteran Member
Join Date: Apr 2009
Location: Southern Ontario, Canada
Posts: 1,181
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Quote:
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Originally Posted by AF1Strider
Hello, I have a 350 in my '74 Z28, it has 64cc heads, and I can only assume it has flat top pistons. I was wondering if anyone could help me out on ball park of a compression ratio it might be pulling. The head casting numbers are 14096217 and the block is 10243880. Thanks for any help.
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Approximately 10:1, would need more info to give an exact compression ratio, such as if block has been zero decked, heads shaved, gasket thickness, more info on pistons
__________________
Chris
1981 Camaro Z28 Maroon
-350 4bbl
-TH350 with 3000 RPM Stall Converter
-10 Bolt Posi 3.73
-Wanted Cars & Concepts T-Top Weatherstriping Left and right Side
1967 Chevelle SS (Clone) Oshawa Built Car
-427 .60 over
-Borg Warner Super T10
-Dana 60 3.54 Posi
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04-15-2012, 01:23:52 AM
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#3
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Gold Member
Join Date: Sep 2004
Location: Southern Maryland
Posts: 8,144
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without knowing pistons we don't know anything. I have built very similar engines, some having dish tops and some having flat tops depending on how much money was spent on them and what octane was desired. You wouldn't know without checking though.
__________________
Steven H. www.carfap.net
1985 BMW 745i Turbo, Euro model import, 18" Antera wheels
1986.5 Porsche 928S, 5.0 32v V8, 18" 993 turbo wheels
1988 K1500, 5.7 TPI swapped
1999 C1500, new 5.7 Vortec, 4" lift spindles, EFILive V2 tuner
2003 Mercury Marauder, 4.10s, Heinous billet rear control arms, SCT Advantage III tuner
2004 Taurus SEL, Ingalls tubular control arms
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04-15-2012, 02:34:22 AM
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#4
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New Member
Join Date: Jul 2011
Location: Albuquerque, NM
Posts: 24
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I'm don't know anymore about the motor. I bought the car in August and the people I bought it from didn't know much about or what they were doing with it. I haven't torn it down yet, was just wondering about the compression ratio. Thanks for some info on it.
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04-15-2012, 10:27:06 AM
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#5
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Lifetime Gold Member
Join Date: Mar 2001
Location: Joplin Mo. 64801
Posts: 11,970
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10 to 10.25:1 compression
It works best with the 0.015" shim gaskets with the std 0.025" deck height.
__________________
71 Camaro 355 NA
11.1650 @ 119.30
1.5028 60'
Quote:
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Originally Posted by Lowend
For the record I agree with Aces and hhott71
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Originally Posted by Lowend
If the rear end grenades it blows your nuts off...
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Originally Posted by Strange81Z
That's because we have more to give....ask any women who's been with a conservative and a liberal! LOL!
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