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Originally Posted by Jonesyfxr
(Post 4349436)
I've read and read until I see crossed eyed. I know in a car application a studded 2 bolt block can handle close to 1000 hp but these are short bursts down the track, not going 5000 rpm or more for extended lengths of time like in a boat. I'm having a hard time finding some 4 bolt 454 or 427 blocks. I'm sure they're around but people don't want to give them up. I was thinking about a studded 2 bolt block with main cap girdles. Any thoughts, experiences or suggestions would be greatly appreciated!!
bbc 4 blot blocks and 2 bolt blocks are the same you could either buy after market main caps or gm 4bolt caps and have the block line bored and taped . i have a gen5 454 block also $350 |
Thanks for all the help guys. I will let you know my decision shortly.
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How much stronger is the 2 bolt with good ARP bolt set?
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Mkiv heads go right on use the gen 5/6 head gasket. Gen 6 is the same As a gen 5, just with a roller cam
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Ok thanks guys!!
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The only difference between the 2 bolt and 4 bolt blocks is the main caps and the steel crank instead of a cast crank. I ALWAYS get 2 bolt blocks and put 4 bolt main caps on. My machine shop drills and fits the 4 bolt caps then align bores for the crank. Never had one come apart even using stock bolts. Besides 2 bolt blocks most people think are junk and will almost give them away.
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I run a 450hp 2 bolt mark iv in my boat and never had a issue.
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Did you use ARP bolts or studs? How big is your boat?
Thanks |
here you go... Gen 6's are all 4 bolt blocks and rollers......
http://www.offshoreonly.com/forums/s...ocks-sale.html |
Seaman, what did you do to it to get 450hp, please.
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