Thread: can you make a 427 a 454?

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just by swaping cranks and pistons?

366T = 3.935" x 3.76"
396 = 4.096" x 3.76"
402 = 4.125" x 3.76"
427 = 4.250" x 3.76"
427T = 4.250" x 3.76"
454 = 4.250" x 4.00"
496 = 4.250" x 4.37" (2001 Vortec 8100, 8.1 liter)
502 = 4.466" x 4.00"
572T = 4.560" x 4.375" (2003 "ZZ572" crate motors)

T = Tall Deck

ALL production big blocks used a 6.135" length rod.

I know the stock spec.

So will the 4" stroke crank bolt right in and clear everything?

Yes, 427's and 454's share the same block.

I know this is the big block section but does a 267 share the same block as the 350? I figured it was the same basic question.

No, 267 has smaller bores and possibly smaller crank bearing journals.

So i can have it bored to a 350 although it is not very cost- effective. how many thousandts would i have to bore it to achive this.

Well, you'd have to bore it 500 thousandths, but you'd probably hit water by then.

I didn't think it was possible or probible. i'll just buy a new or used 350.

Pre 69 SB's are small journal blocks.

Originally posted by viking
366T = 3.935" x 3.76"
396 = 4.096" x 3.76"
402 = 4.125" x 3.76"
427 = 4.250" x 3.76"
427T = 4.250" x 3.76"
454 = 4.250" x 4.00"
496 = 4.250" x 4.37" (2001 Vortec 8100, 8.1 liter)
502 = 4.466" x 4.00"
572T = 4.560" x 4.375" (2003 "ZZ572" crate motors)

T = Tall Deck

ALL production big blocks used a 6.135" length rod.

i like 4.28x4.25 with 6.385 rods =489

do you have to use a tall block for this combo?

No just the standard deck height block. To convert a 427 to 454 just drop in the 454 crank with pistons and also, this is important, you must run the detroit balance Harmonic balancer and Flywheel / flexplate with the counterweights on them to balance up the bottom end properly.