Quote:
Originally Posted by mgarblik
I had a little time to bolt a torque plate on the block and get some preliminary cylinder bore measurements. I will post up a bore chart in a couple days. It appears this block was torque plate honed in 1980-81 when it was rebuilt. I measured one side with the plate on and then measured the other side without the plate. The SD-455 block is extremely stiff, nothing like ANY Pontiac stock block I have ever measured. The difference between plate on vs plate off was no more than .0005" difference anywhere I measured thrust or pin side. A typical Pontiac block will be .001-.0015 variation, plate on vs off and some that are near .060" over size can be .002-.0025 variation. Very impressed with the casting quality and stiffness. When I get it home I will weigh it empty and compare it to a 72 455 I have laying around here. It will be interesting to see how much heavier the SD block is. I will make a guess that it is 15 lbs heavier than a regular 455. We will see.
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Any chance you could Sonic scan of the cylinders?
Unfortunately the SD blocks I've checked the thickness isn't very impressive. I've only scanned about a half dozen or so and all have been 1974's or SR blocks. I'm curious if the earlier cast blocks may have been different .