maverick18

iTrader: (5)

I'm in the process of piecing together parts for a Texas speed 408 and trying to figure out my CR. I once ran across a great thread that had all the information (head gasket bore, deck height etc...) I needed to calculate but can't find it now. I know the bore and stroke is 4x4 and my 241 chamber volume is 66.67cc. any help would be great.

Thanks





http://www.gtsparkplugs.com/CompRatioCalc.html

Tainted

iTrader: (9)

Indeed, id link you but im on my phone seach "Ls1tech compression ratio calculator" in google and you will see it

JakeFusion

iTrader: (7)

A lot of that depends on the specs of the 408 being built. Stock LS1 has -.006" deck height, 3.910" bore gasket, .054" gasket thickness, etc. What gaskets are you using? GM MLS? Cometic?

Did they deck the block? Most aftermarket builds have the pistons out of the hole -.010" when assembled.

Tainted

iTrader: (9)

That calculator has all the provisions for those factors

maverick18

iTrader: (5)

Thanks, I think I found the link. Would this be it?
https://ls1tech.com/forums/generatio...xcel-file.html

I can't seem to get the Excel sheet to open...

maverick18

iTrader: (5)

I guess what i'm looking for is the standard deck height, gasket bore for the iron block so I can plug and play different gasket thickness and pistons to reach my desired static CR.

Tainted

iTrader: (9)

Thats it but how are you trying to open it? I was able to just click it amd open or save us then open

batboy

iTrader: (6)

This is the calculator I generally use:

http://www.csgnetwork.com/compcalc.html

A 408 stroker iron block will have a bore of 4.030" and a stroke of 4.000". Head gasket thickness if you use GM MLS gaskets is .051" and diameter will probably be 4.060". The deck height (piston out of the hole) for a stock LS engine is usually about -.006". You'll need the piston volume and combustion chamber size too.