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Old 10-17-2012, 02:59 PM
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Ya you can remove that bump by the spark plug. It is a foundry locating point.
You still have to verify piston dome to chamber clearance at TDC. Should be .050" minimum.
Minor grinding on the chamber wall and or piston dome is fine to get clearance as required.
Check with play doe.

4" bore x 3.00" stroke builds a 302CID. the 113 heads are 58cc (nominal cc)
CC yours. What is the piston dome volume and assembled piston deck clearance @TDC?
You need this to calc the compression ratio.

The 113 aluminum L98 head head has moderate/modest port flow in stock form but flows very good once fully ported. Best with 2.00" x 1.56" "LT-4 style valves and generous porting.
They will make very good power. 450++HP capable on a capable motor.

If you want to build a good high compression ratio engine you want to get the net quench clearance right .038" ish is good.
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