Maximum bore BBchevy
#2
Senior Member
DYNO OPERATOR
Join Date: Jan 2004
Location: central Illinois
Posts: 459
Maximum bore
427 truck block is good to 4.350" to 4.375" maybe. I would fill it to water pump holes for that big. But you can use a 4.375" stroke or possibly 4.500" stroke on tall deck to get maximum cubes, depending on rod length. This would take cubes from 505 to 540 range.
It has to be a siamesed bore block to go above this size which is a Bowtie GM block or Dart, etc.
Remember, a tall deck block and aftermarket heads create issues with headers fitting in any stock frame car.
That being said, a tall deck or short deck 496 is just a small bore 540 and will do a very good imitation of one if the combo is correct.
It has to be a siamesed bore block to go above this size which is a Bowtie GM block or Dart, etc.
Remember, a tall deck block and aftermarket heads create issues with headers fitting in any stock frame car.
That being said, a tall deck or short deck 496 is just a small bore 540 and will do a very good imitation of one if the combo is correct.
#4
Senior Member
DYNO OPERATOR
Join Date: Aug 2007
Location: Lost Creek, WV
Posts: 533
Re: Maximum bore BBchevy
Originally Posted by jamzilla
I would like to know the max. bore for a tall truck block.And if anyone knows a machine shop near Baltimore. I want to go 4.530.Thanks in advance JIM :?:
TS1955
#9
Senior Member
SENIOR BUILDER
Join Date: Dec 2007
Location: Morrison, Colorado
Posts: 120
I wouldn't try the 4.5 stroke either, as you'll likely hit the oil gallery in the oil pan rail while trying to clearance it............Not sure if they made the truck blocks in the priority main style oiling system though......that would allow it to be opened up a bit..........