Thread: How much power will a 2 bolt block handle?

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Originally posted by grunch
HP has nothing to do with it. A two bolt block is stronger than a 4 bolt in the webbing. A four bolt was designed for extended running at above 7 grand. They were installed to keep the cap from walking. The thicker webbing in a 2 bolt is thicker and will handle more stress than a 4 bolt. Meaning it is "easier" to push the webbing out of a 4 bolt than a 2 bolt. If you want it stronger, Higher comp, ect, use a stud gurdle. It will keep the caps from walking and tie all journals together makeing all of them stronger. this is just my opi, i'm sure somebody will say i'm full of it but there it is. good luck robert

I'm not going to doubt you. I have never heard that a 2 bolt block webbing is thicker than a 4 bolt. I have always thought they were cast from the same mold and was only machined differently.

you could be right, as I have never checked them myself.


and the 4 bolt block was develpoed to help with the stress of higher torque levels placed on the crankshaft and mains . most tow vehicles benifitted from the 4 bolt main blocks. and hp has everything to do with how much a block can handle. as everyone should know HP is a mathmatic formulation of torque/RPM's, to much torque at low rpms can destroy an engines internals. even bolts can only withstand so muct stress before they are stretched or broken. that is why I stated before a stock 2 bolt block can handle just a little over 400hp, and I should have included the torque of around 390 ft lbs at low rpms.

if you want high rpms and 450/450 hp,and torque. you will need to add the 4bolt splayed main caps. and use ARP bolts or studs. and when you spin an engine at higher than stock rpm's other things will need to be addressed as well, like oiling, bearings, valvetrain components, and ignition. no factory stock parts were made to go much beyond 6000 rpm's .