Most everybody's modern designs have gone to the girdled main cap design where all the caps are part of a larger casting that ties them together and cages the entire bottom end. This is a far superior design to engines that end the crankcase at the mid diameter of the main bearings whether equipped with 2 or 4 bolt main caps or use a deep skirt without crossbolting the mains. The girdled design supports the caps in all directions and reduces the labors of the bolts to simply clamping the major parts together. No longer do the bolts see bending moments as they struggle to keep free caps aligned with the crankcase against the forces of the flailing crankshaft and twisting block.streetpirate said:what commonly available production gas engine has the strongest stock bottom end?
cobalt327 said:Strange has had a hybrid "S-60" rear end out for quite a while now. It has the 9.75" ring gear.
They say: "...the Strange S-60 is equal in strength to a 9" Ford." They also say "...is significantly stronger than a 12-bolt w/only 20-25 lbs. of added weight.
From that, one can infer that the 9" is stronger than the 12-bolt.
For years (pre 9" Ford), the early Olds and Pontiac diffs were used in dragsters, etc.
CUBIC INCHESstreetpirate said:I love discussions like this
so right now its looking like the best compromise between strength and availability would be the big block mopar? Is there a specific element that makes the RB's better than the B's?