A833 NP A body trans ID help & intro.

rumblefish360 said

The 3spd and 4spd OD have the same first gear.
Thick wall engines are generally a myth.
Sonic check!
I had an early 340 tank with only a .030 over bore. Some cylinder walls were under .050.
Sonic check any block you get.

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OK, I do not have a 4 speed OD box, It's a normal box and am curious around what year it is. There is so much more info available now, then my last project 20 years ago. In my day, most 4 speed trans had numbers stamped on the id pad. Nothing on mine. Guy I got it from didn't know its origin unfortunately.
Rob, of course I'll sonic check. Core shift has alot to due with this also, and all blocks are not created equal. This is not my first rodeo.
My last 360 build, the machine shop checked the cyl. walls and told me .120 was not a problem, as he had done many 1971-72 at .100 to .120. I ran mine pretty hard and never had any problems. I believe RustyRatRod here said the same. If I do a 408 I'll just clean it up, as the cylinder side loading is greater with a stroker. At 71 I'm just here to have fun and learn what I've missed out on for 20 years.