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Old 07-21-2002, 02:15 AM
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Post Piston/bore clearance

We have aquired a 350ci sbc for use in a short oval racer in the UK. It is exceptionally smokey! We've stripped it for inspection, the pistons are +0.030". Bores measure 4.033" +/- 0.001". The piston skirts measure 4.028"/4.027" top to bottom and 4.001"/4.002" across the pin. Is this within tolerance for a de-glaze and new rings? If not is it safe to bore to +0.060" for performance applications?

Judging by the ring gap, we suspect the +0.030" pistons have been fitted with std rings!!!

Any advice welcome,


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Old 07-21-2002, 05:46 AM
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Alan....I'm not sure about the de-glaze and new rings but if that block is a high nickel block you wont have any problems boring it .060. Pull off your timing chain cover and see if theres a 10/20 (or even just a 20) under there. If you find it the 20 stands for 20% nickel which is one of the stronger blocks. If you dont find it under the timing chain cover look on the back of the block under the flywheel. Hopefully someone else will give you more info on this and maybe you'll only have to change the rings. Sorry I couldnt be of more help.

Good luck,
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