E85.

and a couple extra fuel tanks,lol.

This has nothing to do with lowering your C/R but may figure in on the overall cost of the build. What exhaust are you using at this point?

Also curious if engine was dynoed marinized with marine exhaust or bare bones with dyno headers. Wonder if rings weren't seated. Something doesn't seem right with those numbers but regardless I get that's not what he's looking for and I for some reason can't get much below 10.3:1 based on info and figuring .040 head gasket. If piston are .005 or .010 in then it only gets further from 10.5.

I could have "or not" have figured something right. I would imagine a new NA build would aim for 38 to 44 quench but either way I'm coming up with different SC although many unknowns. For all we know heads could be decked also.

what is to be considered ideal SC for whippels. I'm just trying to figure if opening chambers 8 or 9 CC's and thicker gasket even gonna get in the ball park without swapping out to dish like mike mentioned.

I assume engine was dynoed with shop headers since the engine was installed by a performance marine center, not the engine builder. Both, the engine builder and the marine engine installation center are top notch. The engine build/price sheet shows custom work to block, heads, cam, almost everything

Imco risers to short pipes

With some chamber porting, and thicker head gaskets , he could be down in the 8.9:1 range. I would have no issues putting a blower on a 9:1 engine, as I have and had no issues doing so.

Compression Ratio Calculator | Tools | Diamond Racing Pistons

That's what I'm not understanding if the builder and installation are a top notch facility which I'm certainly not trying to imply any differently but how is it the said engine is a 10.5:1 comp. just saying. I'll have to use the diamond calculator and come up with 10.5. Actual and what was told are off to much.

Is this gonnna be intercooled? I did ck on diamonds calculator and glad I did. Only way he could be at 10.5:1 is if the heads got whacked down to around 111. To be honest I'm glad you referred to diamonds calculator as it's much more build specific than Wallace. It change my piston order from dish to flat which I prefer anyway.

I looked around and noticed many don't ask for rod length, block height nor top ring to top of piston. In fact after a quick search diamonds calculator is superior to any others I looked at. I can understand why some do the old fashion way. After entering same info in other calculator I'd get two different ratios. Not good.

"""""""""As it turns out for those who is compression calculators after playing with some different rod lengths and block heights it makes no difference. Top ring to piston top thickness of course does. Just an FYI"""""""""

I'll reach out to builder tomorrow and see if he keeps records.

Engine is in a 22' Talon and does 105-108 on GPS every time, just wanted to put her in the upper teens.

Outboards are so much EASIER & CHEAPER (LOL)

WetteVette's 23'WPM went mid/upper 120's with a pump gas 598" . Give him a PM. Hopefully he answers. Really nice guy !