http://www.summitracing.com/parts/ESP-B11012060/ (4.25")
http://www.scatcrankshafts.com/
http://www.summitracing.com/parts/ESP-B ... /?rtype=10 (4.375")
theres dozens of rotating assembly's available for the Chevy big block engine , but because the stock OEM production 454 block is occasionally cast with fairly thin cylinder walls and in the MARK-IV the oil passage is located in the lower block most builders limit those blocks to a 4.25" max stroke even though some blocks will accept the slightly longer 4.375" crank with minor clearance work IF THE CORRECT CONNECTING RODS are selected.
yes we have all seen, or at least heard of guys that (successfully) bore the big block chevy cylinders to .060, or even .100-.125 over bore but what most guys fail to realize is that blocks that will accept that much of an over bore are rather rare and must be sonic checked and in most cases partly have the coolant passages filled before being bored to that bore size and even then its likely to be rather crack prone with the longer strokes higher stress levels.
in almost all cases your going to be well ahead financially in the long term to spend the extra cash (ALMOST $2200-$2700 currently) to get a DART AFTERMARKET BLOCK with its far thicker cylinder walls and main web and deck thickness cast from stronger allow than to push a production block that far, especially once you compare total cost in machine work required and the potential for trashing a $2000-$3000 set of heads AND/or
a $2000-$3000 rotating assembly and hundreds-or in a few cases,thousands of dollars more in valve train,and oil system components if the engine catastrophically fails at high rpms
MARK VI BLOCK OIL CONNECTIONS
http://www.dartheads.com/products/engin ... block.html
http://www.dartheads.com/products/aitdo ... e_id/1598/
READ THESE
viewtopic.php?f=51&t=125&hilit=sonic+test
viewtopic.php?f=51&t=976&p=1706&hilit=block+fill+epoxy#p1706
viewtopic.php?f=51&t=588&p=869&hilit=block+fill+epoxy#p869
viewtopic.php?f=51&t=125&p=155&hilit=block+fill+epoxy#p155
496 builds
viewtopic.php?f=69&t=1420
viewtopic.php?f=69&t=5123
http://www.scatcrankshafts.com/
http://www.summitracing.com/parts/ESP-B ... /?rtype=10 (4.375")
theres dozens of rotating assembly's available for the Chevy big block engine , but because the stock OEM production 454 block is occasionally cast with fairly thin cylinder walls and in the MARK-IV the oil passage is located in the lower block most builders limit those blocks to a 4.25" max stroke even though some blocks will accept the slightly longer 4.375" crank with minor clearance work IF THE CORRECT CONNECTING RODS are selected.
yes we have all seen, or at least heard of guys that (successfully) bore the big block chevy cylinders to .060, or even .100-.125 over bore but what most guys fail to realize is that blocks that will accept that much of an over bore are rather rare and must be sonic checked and in most cases partly have the coolant passages filled before being bored to that bore size and even then its likely to be rather crack prone with the longer strokes higher stress levels.
in almost all cases your going to be well ahead financially in the long term to spend the extra cash (ALMOST $2200-$2700 currently) to get a DART AFTERMARKET BLOCK with its far thicker cylinder walls and main web and deck thickness cast from stronger allow than to push a production block that far, especially once you compare total cost in machine work required and the potential for trashing a $2000-$3000 set of heads AND/or
a $2000-$3000 rotating assembly and hundreds-or in a few cases,thousands of dollars more in valve train,and oil system components if the engine catastrophically fails at high rpms
MARK VI BLOCK OIL CONNECTIONS
http://www.dartheads.com/products/engin ... block.html
http://www.dartheads.com/products/aitdo ... e_id/1598/
READ THESE
viewtopic.php?f=51&t=125&hilit=sonic+test
viewtopic.php?f=51&t=976&p=1706&hilit=block+fill+epoxy#p1706
viewtopic.php?f=51&t=588&p=869&hilit=block+fill+epoxy#p869
viewtopic.php?f=51&t=125&p=155&hilit=block+fill+epoxy#p155
496 builds
viewtopic.php?f=69&t=1420
viewtopic.php?f=69&t=5123
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