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Re: 318 LA block with magnum heads compression ratio?
[Re: GO_Fish]
#201666
01/24/09 11:00 AM
01/24/09 11:00 AM
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Joined: Jan 2008
Posts: 2,251
ILLINOIS
volaredon
top fuel
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top fuel
Joined: Jan 2008
Posts: 2,251
ILLINOIS
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Quote:
My bad.  I was comparing the Mag compression against an old open chamber 318 head, not against a closed chamber 302 head(not sure what year they started with the 302's). I agree, compression between a Mag head and a 302 head would be minimal.
That's what I was thinking as well, being that both 318s I have are completely dead stock (one even has its Lean Burn still) My 78 Fury has '163 heads and not sure which heads my '83 P/U has but I'm thinking they are the exact same ones on there too. Both are still 2 barrel motors (not for long!)
CR wise, yeah; the 302s will be about the same as the Magnum heads; I seem to remember seeing they were rated at like 8.9-9.0:1 but if you run stock Magnum rocker gear you will pick up a bit in rocker ratio which will help things even if onlt a little;
also I'm thinking an LA 318 with Mag heads will be real close CR wise and performance wise to a stock Mag 318.especially if both are running the same intake and carb.
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Re: 318 LA block with magnum heads compression ratio?
[Re: goldduster318]
#201667
01/24/09 12:21 PM
01/24/09 12:21 PM
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Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,586
Tampa, FL
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I would go for the magnum heads... actually the EQ heads.
With a 2.03 intake valve and porting they got flow numbers of 275/int -- 229ex at .600 lift........
that is pretty decent for some cheap cast iron heads.... TBF
71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
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