Posted by Hugh McKinney on February 18, 2013 at 17:05:41 from (75.104.206.93):
In Reply to: D Slater-LPG head posted by CNKS on February 18, 2013 at 16:35:36:
I can tell you, from having a 450 LPG, that I just had rebuilt, that the factory pistons on a 450 LPG, are the same as what come in a comparable 450 gas. The extra compression in the LP motor comes from a smaller combustion chamber, and not from different pistons. I don"t know about the Fire Crater pistons, but if they have a taller deck height than the standard pistons, I would think about standard pistons. I have built a 351 Ford V-8, 4-barrel engine, that had about 200 psi cranking compression, and it would just barely get by on 92 octane unleaded. I ended up installing a thicker copper "head-saver" gasket made by Fel Pro, and had no problems from then on with just regular unleaded, 87 octane. My point is that 197 psi at cranking speed is going to be marginal on even 92 octane (premium) unleaded, but there are two ways to lower the cranking compression: Lower deck height pistons, or thicker head gaskets, which are offered by Fel Pro and some others. You can also have your Fire Crater pistons machined down a little, it will not affect your 281"s balance significantly, nor will it adversely affect the pistons" durability. Any questions, drop me a line, Hughmc0726@aol.com.
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