INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

Compression Help

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Old 03-27-2011, 08:23 PM
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Default Compression Help

I know I need to determine Static Compression as well as Dynamic in order to see how well my cam will suit the build but right now I'm trying to determine if the rotating assembly i'm going to build will meet my DCR goals and then I'll see if the cam puts the SCR where it needs to be.

Does all of this look right? I'm really not sure about the Block Deck Height and really only guessing on the Piston compression height. I plan on running L92 heads milled 030 N/A and then swapping to non milled 71cc L92 heads later if I run F/I. I Really need to get around to ordering the rotating assembly so I need to make sure these numbers are right so I can get it ordered.

Here's what I Think i need to order on TSP's site:



Here is what I think the CR is going to be but again need help with the Piston compression height and the deck height to be sure. My goal is to have a 10:1+ CR with milled 030 L92s and 9.5 ish with stock L92s


Old 03-28-2011, 09:30 AM
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On that -15cc dish piston the compression distance is 1.110", so your piston is zero deck at 9.235". In general, the iron blocks are about 9.230" on deck height, but that does vary one to the next even brand new from GM!
Old 03-28-2011, 02:52 PM
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Thanks! So that should get me a 10.3 then a 9.6 from 64cc to 71cc heads. That should be what I needed to confirm. Hopefully I can get this ordered next month.
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