Reply to "Which piston for 351C .020 over"

George PAdmin.

The Ross piston can be special ordered going through Summit Racing. Manufacturing custom piston is Ross' main business.

With 4.020 bore and an aftermarket Cobra Jet cam advanced 4 degrees (IVC = 70 degrees ABDC), the engine needs 79cc clearance volume to achieve 7.8:1 dynamic compression. I'm assuming for the moment that the block has never been decked.

Comb chamber volume = 66.1cc
Head gasket, Fel Pro 8347= 10.4cc
Deck Clearance (9.215 deck height, 1.668 compression height) = 3.6cc
Piston to cylinder wall clearance = 0.2cc
Subtotal = 80.3cc

So you'd need a pop-up dome piston with a -1cc dome, or if you order the standard flat top (3cc dome volume) you'll need to have the heads milled 0.024 inch.

Without milling the heads or pop-up domes, the engines Vc would be 83.3cc, 9.74:1 mechanical compression, dynamic compression would be 7.5:1.

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1/13/1912:13 AM

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