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!

(IMG:http://www.914world.com/bbs2/uploads_offsite/media.giphy.com-23760-1708984357.1.gif)

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.

(IMG:http://www.914world.com/bbs2/uploads_offsite/media.giphy.com-23760-1708984358.2.gif)

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!

[Jack Standz]

1. It's all in the combination, what pin height on the pistons, rod length, cylinder length, etc. You might want to rethink your rod length to get a better rod ratio (rod length to stroke). But, yes you're looking at getting some proper thickness cylinder spacers.

2. Measure multiple times and get one spacer per cylinder that are the correct thickness.

3. The type iv store sells them, Blanchard ground to the thickness you pick from their website.

4. Design your motor for less compression or at least, the appropriate compression ratio. If it's too high, it will put out too much heat and you will also need to retard the ignition to prevent pre-detonation. You want maybe around 8.5 to 9.5 max and somewhat dependent upon the altitude you're running it at. You'll want good quench, a deck height probably of at least .040, so cylinder head shape and volume needs to be measured and designed to meet your goals.