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!

[technicalninja]

Watch for evidence of exhaust back pressure if you re-use an SSI exhaust system.

At high load (when the restriction is the greatest) a restrictive exhaust will HOLD the heat in and this is a killer thing on an engine that is cooling system weak like the T4.

I'm not sure what the back pressure limit is on an air cooled T4.

Performance water pumper needs less than 1/2 a psi.

Normal appliance car needs less than 2 psi.

Water pumpers get noticeable weak at high load at 5 psi.

I'm guessing an air-cooled will be MORE critical regarding back pressure than a water-cooled.

You can plumb an old school fuel pressure gauge into the exhaust with a long piece of stainless tubing before the vacuum tubing as a heat sink. Never run this un-connected.
The trapped air bubble keeps 1000-degree exhaust gasses away from your gauge.