Editing 383/388 Chevy stroker (section)
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====Pistons==== The HT 383 [http://www.summitracing.com/parts/nal-12499103 '''pistons'''] are a letdown. They're the same old tired, cheap-to-make 4 valve relief, pressed pin, round dish pistons GM has been foisting off on the public since years ago when the drop in CR was mandated. These pistons have no redeeming qualities, unless you consider the aluminum alloy being hypereutectic a plus. What is known about these pistons: *They're hypereutectic aluminum alloy. *They give a 9.1:1 CR with a 0.028" thickness head gasket and the Vortec chamber size of 64cc. **Chevy shoots for a 9.0" stack of parts for SBC engines. Using a 9.025" block deck height, 3.8" stroke, and 5.7" rods, the piston CH would need to be 1.4” for the stack to equal 9” (1.9 + 5.7 + 1.4 = 9.0). The actual compression height of the HT383 piston is presently unknown. **Using the quench distance of 0.053", a piston dish size of 21cc would be about right for a 9.1:1 CR. A 9.1:1 compression ratio using a quench of 0.040" will require a 24cc dish.
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