So for those who haven't messed with an SD4 block before here's a pic of the bottom end. Plenty of support, the pan rail is also thicker than production blocks. I mentioned 5 cam bearings before, it's more like 3 and 2 halves.
Crankshaft is pretty indestuctable by Pontiac standards. They originally shipped these with Chevy Bow Tie rods. You have to use a narrow rod bearing due to chamfer on both sides. There is also an oiling modification to oil the cylinders.
I'll get more pics of the Cosworth stuff and put 'em up for those who were interested.
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68 Tempest Conv  06 GTO SRM A4  462 Ram Air VI-LXXI motor in progress 
Last edited by Blowd; 02-06-2009 at 08:13 PM.
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