I'm in the position to pick one up for $500 and I was wondering what is the difference in them all?
- posted
18 years ago
I'm in the position to pick one up for $500 and I was wondering what is the difference in them all?
2 bolt main = main caps are held on by two bolts each
4 bolt main = main caps are held on by 4 bolts each
4-bolts are supposedly stronger and can take more HP in super-high output applications, but for a stock motor or anything up to 350 HP or so a 2-bolt does just fine.Doc
I found this article that helped. Thanks for your responses.
Actually I would say about 400 HP and about 6500 RPM or so. If you plan to exceed these levels regularly I would go with a 4 bolt block. ALso I would not supercharge a 2 bolt block either at any HP level.
I hope your not paying $500 for a bare 4 bolt block, i get them all day long already prepped...tanked, magged, decked and bored +.030" for $350 Add another $700 and you get a balanced and assembled 383cid short block with a Scat crank, 5.7' rods and Keith Black pistons, externally balanced
168 tooth flexplate and harmonic balancer.....
Where can I get one for that price? Is it a long block at that point?
Larrys Performance shop in Montebello,Ca.
another great link for ya..
How can I tell if its a 4 bolt with out taking the oil pan off?
If it is a Post 82 or 84 Block it will have the Displacment on the drivers side of the bellhousing flange, older blocks have a casting number there. Newer blocks have a casting number on the middel of the bell housing flange. Run those numbers. There is also a pad by the waterpump that has numbers punched in it. Between the two sets of numbers you can tell what it was orginally in, 2 bolt mains vs 4 bolts, orginal HP & Torque Output. Charles
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