View Full Version : Big Block Chevy Help
badluv
09-03-2007, 04:48 PM
:?: I have a 1998 gen 6 454 block,how big can it safely be bored to.If you turn the block upside down and look at the bottom of the lifter valley it has 7.4/8.0L does this mean it could have been used for a 502.Thanks
edvancedengines
09-03-2007, 06:58 PM
That is possibly correct.
Do you have the full casting number of the block?
The gen 5 502 was only good for 700-750 hp.
Ed
I have a gen 6 block 566 making 985hp with 4.605 bore. So far so good.
edvancedengines
09-03-2007, 10:37 PM
I believe your name is Steve, according to your signiture?
If the block is a Gen 5 or Gen 6 BowTie it is very strong. I wouldn't be scared to put 2,000 hp in either one. It is the standard 502 cu in block that is weak in the main webbing but it will bore bigger. GM recommends to to go 700 hp . I consider this to have a safety factor included though. I do know of them doing more hp.
Ed
I believe your name is Steve, according to your signiture?
If the block is a Gen 5 or Gen 6 BowTie it is very strong. I wouldn't be scared to put 2,000 hp in either one. It is the standard 502 cu in block that is weak in the main webbing but it will bore bigger. GM recommends to to go 700 hp . I consider this to have a safety factor included though. I do know of them doing more hp.
Ed
Yes my name is Steve.
The 566 I built was for a guy in WV who had to run a "stock block" class. Then 2 weeks after we finished it, they changed the rules to allow aftermarket blocks. Go figure...
This off season we are going dart.