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rotorwrench · 07-05-2013, 01:30 PM

Tin can sleeves were common in that time frame. The sleeve could be removed & replaced using standard pistons or they used to have some pistons sized to just hone the bore after removal of the sleeves. Many of these were bored to 3 3/16" and standard 239 pistons fitted. The trapezoidal (keystone shaped) hole in the center of the deck IDs the block as a 221 with 3 1/16" pistons originally. The Mercury & truck 95 HP 239 blocks had round holes in the center of the decks.

If it is already 3.1875 in the bores and can be honed to clean, you can still go with 239 pistons & have a 239 CID motor.

07-05-2013, 01:30 PM	#68
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,433	Re: Engine block I.D. pictures Tin can sleeves were common in that time frame. The sleeve could be removed & replaced using standard pistons or they used to have some pistons sized to just hone the bore after removal of the sleeves. Many of these were bored to 3 3/16" and standard 239 pistons fitted. The trapezoidal (keystone shaped) hole in the center of the deck IDs the block as a 221 with 3 1/16" pistons originally. The Mercury & truck 95 HP 239 blocks had round holes in the center of the decks. If it is already 3.1875 in the bores and can be honed to clean, you can still go with 239 pistons & have a 239 CID motor.