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  1. #1
    Short and stout nunes792003's Avatar
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    Question 327

    I've got a question that may seem dumb. Can you put 72cc heads on a small block 327 that is 40 over with flat tops. Also what do you think the compression ratio will be. Will it be to low. Thanks for the help.

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    Senior Member ap67et10's Avatar
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    yep, but the compression will be super low. probably in the 8.2:1-8.5:1 range, depending on the gasket, and how far in the hole the piston is. i wouldn't do it though...that short stroke thrives on compression. they are total dogs if you don't have any.

    AP

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    Short and stout nunes792003's Avatar
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    Thanks for the help. I thought this would be the case. I have a set of 305 heads I can put on it as these are 64cc

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by nunes792003 View Post
    Thanks for the help. I thought this would be the case. I have a set of 305 heads I can put on it as these are 64cc
    Some of the 305 heads are 58cc.

    I know where there is an inexpensive set with port work and larger valves. My friend ran them on his dirt modified for a couple of races until he could afford a set of aftermarket.

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    New here Beer:30's Avatar
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    I put a set of 64cc TrickFlow aluminums on a .080 327. They actually checked out at 62.5-63cc (chambers). The pistons are SRP forged units, flat-tops with two valve reliefs. With a standard Fel-Pro head gasket, we ended up with 9.8 after the block was decked. Don't know if this helps.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


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    gn7
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    Just remember, you are only a crankshaft away from a 383 and roughly 9.75-1 with flat tops AND 76cc heads.



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    Last edited by gn7; 09-21-2009 at 05:37 PM.

  9. #7
    What the Hell is That? 72Hondo's Avatar
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    I run a 327 30 over with flat tops, and 64cc heads. Comp is a 6-1 deal Personally I think its 7-1
    Quote Originally Posted by Kyle View Post
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    AKA Blownjet 468 Blowncat 509's Avatar
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    don"t you mean more like 9.5:1 / 10.00:1 ? back in the day, I built a .060
    (337) it had flattops, and I angle milled the 461 castings .125 and ended
    up with just shy of 11.00:1 ! of coarse also had to cut the valve reliefs
    big time for the .560 lift Crower solid cam, but it really sounded sweet at
    8200 rpm!

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    Senior Member earlbrown's Avatar
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    Without knowing where the piston is at TDC you cannot even begin to guess compression with any accuracy.

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    New here Beer:30's Avatar
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    Quote Originally Posted by earlbrown View Post
    Without knowing where the piston is at TDC you cannot even begin to guess compression with any accuracy.
    Very true. The one I posted about was setup and checked by the builder. He set the piston-deck height and cc'd the chambers and valve reliefs. Adding for the gasket(s), we ended up at 9.8:1
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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