RARON455

iTrader: (35)

I am tryin to figure it out, I have tried some of the compression calculators and cant seem to get it right, hung up on deck height clearance, for one.
What would the compression ratio be on a stock 1998 LS1 short block with GM MLS head gaskets (I have read about .052 is what some say thickness is) with heads that have been milled to 59ccs.
any help would be appreciated.
I spun some bearings, and the crank is toast, Due to an electrical failure on the Nitrous system. So I am going forged 383 kit, but trying to figure out what pistons to go with that would give me a good pump gas compression ratio. car ran super on the Original LS1 block with the 59 cc heads. but have no idea of compression ratio.
I know alot of guys like the 408 but it is my understanding that to make the most of it I would need different heads, and to be honest that is another cost I just cant handle, I also like saving the 80 lbs on the nose of the car.

Oh yeah, It is a street car that sees the track on weekends, and going to the forged setup I am gonna spray 200 on it.


Thanks fellas.

BriancWS6

iTrader: (18)

11.44-1 is what I get using the .052 gasket thickness that you listed.

RARON455

iTrader: (35)

Yeah, I am stumped on the flat top pistons, and the fact that the pistons pop out of the hole, cant figure the deck height myself.. confused on it.. what numers are used to determine the volume with it having negative deck height?

hammertime

iTrader: (1)

Same here...

I calculated that an 8cc dish should get you about as close as you can to the same compression in a 383, give r take for a mild hone.

69LT1Bird

iTrader: (1)

Here is a good online calculator.

http://kb-silvolite.com/calc.php?action=comp

Sales2@Texas-speed

iTrader: (5)

What camshaft are you planning to run? Our 383ci kit with the Wiseco -8cc dished pistons and a .045" gasket (assuming zero deck with the Wiseco piston) you'd net right at 11.3:1 static. Of course you can tweak that a bit with decking on the block, gasket thickness, etc.

RARON455

iTrader: (35)

Cam is a custom ground comp

224-236 @ .050 .610-.608 114+4 dyno Tuned by you guys back in september, Believe it was John? who tuned it. car ran super made great power and really screamed, last time at the track though it let go.

another question is will the wiseco pistons pop out of the bore like the stock ones, or will the block need to be decked to 0?

Sales2@Texas-speed

iTrader: (5)

The Wiseco's are zero deck at 9.24" deck height.