Re: [Amc-list] LPG 258

[Jim Blair <carnuck@xxxxxxxxxxx>]

Actually, since the VE (volumetric efficiency) goes up with the 4.0L head (even more with the HO head) the compression will go up slightly.

Jim Blair, Lynnwood, WA '87 Comanche, '83 Jeep J10, '84 Jeep J10

From: Frank Swygert 
Subject: Re: [Amc-list] LPG 258
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Look for different pistons -- you can only go up maybe one full point by shaving the head alone. Compression doesn't go up with the 4.0L head on a 258 -- only 8.7:1 (stock 4.0L). The combustion chamber sizes are the same on the 258 and 4.0L.

------------
Date: Thu, 02 Oct 2008 16:43:26 -0400
From: Brien Tourville 

LPG runs best with high compression - so -
a 4.0 7120 head to a stock '81 258
would require roughly how much shaving
to accomplish 11 to 1 compression ?

--
Frank Swygert


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