Thread: 454 block or...

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Bought a 454 that ate the cam, it's basically an LS7 open chamber with 7040PA pistons. Pulled it apart and everything looks new except #6 cylinder is pitted. So I need to have it bored, buy new pistons, have it balanced and so on.

Have a set of 0.30 over 427 pistons and rods out of another blown up engine I bought but it needs a crank.

So I can do one of three things. See if the cylinder will clean up at 0.30 over and buy a forged 427 crank, fix the 454. Or I can try to find a 4 bolt block that's good at standard bore and put the 454 innards in it. I've looked a little and 4 bolt standard blocks are scarce.

What would you do?

Al

What power range are you looking for?
2 bolt main can do around 500 hp.
8-900 4 bolt main. Pat can give more precise info on that.
Personally I would go 4 bolt main but thats MY opinion.

depends on how bad the pitting is--maybe if THAT cylinder would clean up at .030 you could just put ONE piston in one cylinder--or sleeve it to stock bore---


how much wear is on the other cylinders???maybe .030/etc on all and a new set of pistons-----if your 454 crank is good , then the way to go is fix it and forget the 427 stuff--besides a crank you would need a flywheel and front dampner for the external balance


the blocks used on those ls7 were generally good for up to 1/8 overbore----------and off the shelve pistons are generally available in 020/030/060/100/125

I’ve often wondered about boring only one cylinder if the others are ok, but I’ve never heard of it being done. Would it cause a balance or vibration problem? It doesn’t seem like .030 or even more would cause a problem. What are the pros and cons of this fix for a guy on an extreme budget? Seems to me it would work fine.

i built a 289 many years ago from junkyard parts and the stuff was so worn that the engine had to be bored to fit each piston .. and i had to custom fit the rings to each piston .. ran it hard for many years ..

Originally Posted by 489Camaro

Bought a 454 that ate the cam, it's basically an LS7 open chamber with 7040PA pistons. Pulled it apart and everything looks new except #6 cylinder is pitted. So I need to have it bored, buy new pistons, have it balanced and so on.

Have a set of 0.30 over 427 pistons and rods out of another blown up engine I bought but it needs a crank.

So I can do one of three things. See if the cylinder will clean up at 0.30 over and buy a forged 427 crank, fix the 454. Or I can try to find a 4 bolt block that's good at standard bore and put the 454 innards in it. I've looked a little and 4 bolt standard blocks are scarce.

What would you do?

Al

sleeve that hole back to STD if you want

Originally Posted by t-top havoc

What power range are you looking for?
2 bolt main can do around 500 hp.
8-900 4 bolt main. Pat can give more precise info on that.
Personally I would go 4 bolt main but thats MY opinion.

more then 500 hp with a two bolt .

while talking 454's will a 2000 454 make a good base to start with ? Can you still bore them .060 with out overheating problems?

You don't need the 4 bolt block for what your building,from what i have read,the 2 bolt main block is good to 500hp