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Old 07-10-2013, 05:25 AM   #1
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Question 11:1 Compression (LPG 108 Octane) 350/383 Build

I'm planning my first project motor (350 for 383 from Summit Racing site), a complete build from the block out. To make things easier, I've decided to go with Trick Flow and Scat kits. I'll list the links to specific parts I'm looking at using below.

My question is, does anyone here who knows about LPG and who know how to build 11:1 compression in this set up, have any advice for parts, gaskets, etc that can produce 11:1 compression without having to bore or grind anything? I kinda want to have it all ready out of the box, since I'm overseas and don't know any quality mechanics around here that can appropriately bore or modify engines, blocks and so on.

Here are the components I'm considering:




I read that for best compression that flat head pistons are necessary. Any advice on that too? Thanks guys!

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Old 07-10-2013, 08:14 PM   #2
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11:1 will not require 108 octane unless you are running a LOT of timing.
I know there are calculators out there to help determine compression ratio, but I don't have any good ones off the top of my head.

Also, research Scat a little bit. If I recall, they didn't have that great of a reputation a few years back.

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Old 07-17-2013, 08:21 PM   #3
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Thanks for the info! Actually I went with 11:1 cause I thought it would be good for the 108 Octane LPG. What compression would you recommend for 104-112 octane fuels like LPG?
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