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Old 02-14-2011, 10:20 PM
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Stock deck clearance of a 454.

im trying to figure out my deck clearance so i can figure my compression ratio out.. does anyone know the stock deck clearance of a 454
thanks

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Old 02-14-2011, 10:58 PM
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Stock 454 stroke is 4", block deck height is 9.8" (true deck is 9.780), rods are 6.135. Find out the piston compression height you'll have it. Half the stroke, rod length, compression distance from the deck height.
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Old 02-14-2011, 10:59 PM
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You have to actually measure it- who knows if or how many times the block may have been milled.

It can be done w/nothing more sophisticated than a straight edge and feeler gauges.
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Old 02-14-2011, 11:31 PM
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My post was assuming the motor was assembled and presumed stock. Figured if it was apart, the OP would know to measure it.
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Old 02-15-2011, 12:00 AM
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If you're looking for a "how far is the piston down the hole" figure to calculate an estimated CR with, use 0.020"-0.025" for a stock unmilled block and a stock compression height piston.
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