Need to know 1949 -53 Mercury V8 Piston Pin Height

[19Fordy]

Can someone please tell me the piston pin height (center of wrist pin hole to top of piston) for the 1949-53 Merc engine. Thanks.

[John R]

Originally Posted by 19Fordy

Can someone please tell me the piston pin height (center of wrist pin hole to top of piston) for the 1949-53 Merc engine. Thanks.

Piston manufacturers' specs quote the compression height as 1.436" - 1.438. But some quote the CH as 1.62 - 1.65 which seems weird. The height of the dome is 3/16".

[38 coupe]

Information from an older thread here on the Barn, specifically post #29 from Bored&Stroked:

Originally Posted by Bored&Stroked

No - "compression height" is a standard automotive piston term - it is the measurement from the center of the piston pin to the top of the deck of the block. The purpose is so that if somebody accurately measures the CH (using a crankshaft, bearings and rod), that they can tell the piston manufacturer exactly where the pin location should be. (This can be necessary as a block may have been 'decked'.

On a standard Flathead Ford with a 3 3/4" stroke, the CH is 1.561. With a later 4" stroke Mercury or aftermarket crank, it is 1.436, with a 4 1/8" 'stroker' crank it is 1.374. So the measurement should be the distance from the center of the pin to the starting edge of the piston crown.

[19Fordy]

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Thank you 38coupe for finding me the info. from B&S.

"On a standard Flathead Ford with a 3 3/4" stroke, the CH is 1.561. With a later 4" stroke Mercury or aftermarket crank, it is 1.436, with a 4 1/8" 'stroker' crank it is 1.374. So the measurement should be the distance from the center of the pin to the starting edge of the piston crown."