Milled Heads How Much Compression
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On The Tree
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From: Bklyn. N.Y. U.S.A.
Milled Heads How Much Compression A friend has chance to buy a set of heads that have been milled 35 thousandths. How much compression will he get with these heads.
<small>[ March 02, 2003, 03:54 PM: Message edited by: Mitch ]</small>
<small>[ March 02, 2003, 03:54 PM: Message edited by: Mitch ]</small>
TECH Fanatic
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From: SW Florida
Re: Milled Heads How Much Compression I was told by TEA that stock LS1 5.7L heads milled .035" will get you a chamber volume of approx 63.3cc
That would be a CR of 10.7 to 1
You don't need anymore than that with 92-93 octane pump gas.
Ron,
That would be a CR of 10.7 to 1
You don't need anymore than that with 92-93 octane pump gas.
Ron,
Re: Milled Heads How Much Compression I believe the amount of compression you can safely run on a given octane is also a function of which cam you are using. The cam can change the static cylinder pressure. Someone correct me if I'm wrong here.
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Re: Milled Heads How Much Compression Cal..
Your right. Long duration cams will require slightly less cyl chamber CC as the static CR is reduced due to a change in cam overlap.
Slowhawk..
Those numbers are using stock graphite GM gaskets.
Ron,
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<small>[ March 02, 2003, 05:06 PM: Message edited by: Kimchee and Rice ]</small>
Your right. Long duration cams will require slightly less cyl chamber CC as the static CR is reduced due to a change in cam overlap.
Slowhawk..
Those numbers are using stock graphite GM gaskets.
Ron,
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<small>[ March 02, 2003, 05:06 PM: Message edited by: Kimchee and Rice ]</small>
Re: Milled Heads How Much Compression I'm running 11.1:1 on 91 octane (don't have 93 in AZ <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> ) without any problems. Also have higher WOT spark advance without knock than I did with the stock heads.
Chris
<small>[ March 02, 2003, 05:24 PM: Message edited by: 2001CamaroGuy ]</small>
Chris
<small>[ March 02, 2003, 05:24 PM: Message edited by: 2001CamaroGuy ]</small>
