Chevrolet changed the design of their blocks in 1986 to a 1 piece rear main seal style block. This block uses a different crank than the older 2 piece rear main blocks. The flexplates, flywheels and cranks are not interchangeable between the different styles of blocks.

These blocks also have the dipstick located on the opposite side of the motor.

Someone correct me if I am wrong but I believe the roller blocks started in 87. This made the 86 block a one of a kind.

 

Actually Chuck, I think that the 1 piece rear main seal and the rollers both started in 87.

[This message has been edited by MattMan (edited May 17, 2000).]

 

Nope. One piece rear main seals in 1986, and roller engines in 1987.

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1991 Camaro Z28
5.7L 5-Speed
13.32 @ 105.27 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
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oops I was wrong, sorry

 

and you can buy a part to run two piece carks in 1 piece blocks about 140 in jegs, by moroso.

[This message has been edited by ede (edited May 17, 2000).]