2270 Deck Height and CR, Pistons sitting proud of the deck, how many shims is too many shims? Options

[vjb206]

Hey folks! I have the bottom-end of my 2270 assembled and spinning freely. Thanks to all who helped me get to this point!

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To quickly recap: I bought the 2257 kit from AA Pistons (78mm stroke, 5.158" rods, etc.). And when I threw a P&C on for a test-fit last weekend, I immediately noticed the piston sitting proud of the deck height at TDC (negative deck) by about 2mm.

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Before I overreact, or buy the wrong stuff, I thought I'd ping the community...

1. Is this normal for a stroker set-up?
2. Can you stack multiple shims when getting up into the .06 >> .09 range?
3. (If no-stack) What's the best place to have custom shims cut?
4. I recall Jake saying using large shims requires lots of advance, anyone have experience here? What am I looking to adjust for upon start-up?

Once I figure out whether or not this is normal (I.E. verifying that I don't have to backtrack), I'll get into the CR questions (just waiting on clear plastic from Amazon so that I can measure my CC volume this weekend) (IMG:style_emoticons/default/biggrin.gif)

Thanks!

[vjb206]

Just to close the loop here, I ordered a few shims just to start measuring with a non-proud deck-height and am taking more measurements around different areas of the piston.

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Right now with a .150 shim I have .064-.068 deck height depending on where on the piston I measure. A few folks have guided me towards a .045 deck height as optimal for quench ( @cgnj , @technicalninja , etc.) so I'll need to wait for 0.13 shims to come in.

Then I'll find time and do this for each I guess since I've been told I can't assume all cylinders will be equal. Lots of measuring and trial-and-erroring until I get as close to .045 as possible; taking as many readings as possible from various points along the surface of the piston.

The 2270 recipe I'm following calls for 9.5:1 with 93 octane (which we have here in NJ), so I'll be a little under with an estimated CR of 9.2 (averaging out my various readings along the surface of the piston). I was originally thinking 9.0:1 "just to be safe," but I do realize now that's not the way to approach this.

Thanks again for all of your help!