Just picked up 2 409’s. One has this number T0525QG. 191060. 656 block. It is single 4 barrel, aluminum manifold. The other has no stamping whatsoever? It is 814 block, aluminum manifold, single 4 barrel. 656 manifold is 3814678, 814 manifold is 3844463. I thought I had a 340 hp 63 and a 340 or 400 hp late 64 or 65. Looks like they both may be 400 hp? Any info greatly appreciated, TIA
Block serial numbers
- Thread starter Sooner66
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Lucky guy!!! I could use a good 65 car block
Come to think of it that 656 block can't be qg code for a 65 as all the suffix codes for 65's started with a J like JA for 400hp JB JC JD and so on. Maybe a re stamp idk? Just a thought
It looks the part.
QG is a 63/ 64 340 horse
All car blocks are the same, the only difference is the stamp. Anyone could have put big heads (690 or 583) and intake on it to upgrade it. The good thing is its a car block, remember all car blocks are the same its the heads, pistons, cam, and intake that made them a high horsepower engine. That stamp only tells you what that engine block left the factory as and if it was a manual or auto. Car blocks in 63 were QB, QA, QM, QG, and QC. In 64 they were the same except there was no QM, I think all 65 blocks the codes started with a J.
Greg Reimer
Well Known Member
You're right. QG is a 340 horsepower Powerglide trans, same block casting as a 400 or a 425 horse motor, just the stamping code was different. The unstamped block could be any of the above. What casting numbers are the heads?
Skip FIx
Well Known Member
"All car blocks are the same, the only difference is the stamp."
Most of mine have had the solid area under the oil filler tube like this picture. I had one block that that area was a separate channel and sealed to the bottom of the intake fill hole area. Used motor I bought in high school(Patt -Bill's Speed and Sport in Irving out of his roadster) had a water leak he said was head that he milled and new head gasket-nope leaking sleeve. At leas I got some 690 heads and a Z-11 water pump out of the deal!
Most of mine have had the solid area under the oil filler tube like this picture. I had one block that that area was a separate channel and sealed to the bottom of the intake fill hole area. Used motor I bought in high school(Patt -Bill's Speed and Sport in Irving out of his roadster) had a water leak he said was head that he milled and new head gasket-nope leaking sleeve. At leas I got some 690 heads and a Z-11 water pump out of the deal!
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Now check the dates on the heads and the dates on the blocks and then you’ll know more about what you have. The intakes even have dates on the bottom side after you remove the splash shield!