[69 Post Sedan]

Did you have to use a block girdle or are they splayed mains?

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This was a stock 39999289 block with 2 bolt mains. No modifications are needed to do this.

All you are doing is de stroking the motor from a 454 to a 427 when you use a 3.76 396/427 crankshaft. 427 and 454 both have a 4.25 bore. But you have to use 427 pistons with a 3.76 crank. 454 pistons will not work with a 3.76 stroke crank. Just as 427 pistons will not work with a 454 4.00 stroke crankshaft.

If you use a 427 piston that is .030 bigger and a 3.76 stroke it is a 433 cubic inch.

I have a photo of the bottom end of the motor I built. Let me know if you want more pictures.

Hope that helps.

Kurt