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Mar 2, 2010 | 10:10 PM

1slowfbody

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engine builders step in

i'm building a forged 383 with 3.905 dish top pistons. i'm going with dish top because i want to lower the compression down to 10.1. so my question is what is the formula to figure out which dishtops i'll need. i spoke with thunder racing today and they said -10 to -12cc should put me in the 10.1 area i want to be in, i just want to double check but if this is true i'll know what to tell the shop to send me. btw the heads going on will be stage 2 LS6 heads.

thanks in advance

Mar 2, 2010 | 10:28 PM

SweetS10V8

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Mar 2, 2010 | 10:43 PM

AES Racing

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what size combustion chamber cylinder head are you using?

Mar 2, 2010 | 10:46 PM

1slowfbody

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Quote:

Originally Posted by SweetS10V8

http://www.google.com/search?hl=en&r...r:new_tab.html

thanks man! makes me think i should send my heads off to be ported and get the paperwork for the flow numbers before i order my rotating assembly

Quote:

Originally Posted by AES Racing

what size combustion chamber cylinder head are you using?

i'll have to call west coast cylinder head tomorrow . . . all i remember is that it started with a 6 lol yeah i'm feeling stupid for not writing it down. like i said above i'm thinking i should send the heads off right now since i have the money so i have the correct flow numbers to make the right piston decision

Edit: i'm going to ship off the heads next week and get those numbers and then i can go from there to pick the right pistons

Last edited by 1slowfbody; Mar 2, 2010 at 11:30 PM.

Mar 3, 2010 | 10:23 AM

1slowfbody

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and thanks to thunder racing and scoggin for being for helpful! i'll be going with -12cc to achieve the compression i need. thanks for that link man!

Mar 3, 2010 | 10:33 AM

TooLateVTEC

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From: FredVegas, Va

Why only 10:1 compression?

Mar 3, 2010 | 11:01 AM

1slowfbody

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low compression high boost, yeah a blower is gonna sit on top the engine

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Mar 3, 2010 | 07:36 PM

1slowfbody

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Quote:

Originally Posted by TooLateVTEC

Gotcha, shouldve been around 8.5-9:1 for "high boost" IMO.

Good luck with the combo

with stage 2 LS6 heads at 66cc, 224/236 F/I cam from thunderracing, the 383 with those dishtop pistons at -12cc at 10 PSI i'm hoping to be in the area of 600rwhp . . . the only reason i'm "guessing" the number is because nobody else in the country has this blower on their f-body except the company doin the install right now to test it. the test 02 T/A with LT's and this blower at 10PSI made a little over 500rwhp with stock 241 heads and the stock cam

thanks man