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Could be right, since engines are normally casted a couple of month before assembly and normally assembly starts a couple of month before the model year. So the engines casting could be as early of June '69 for the 1970 model year...
greetings,
Rob.
Rob.
NCRS Dutch Chapter Founder & Board Member
NCRS Software Developer
C1, C2 and C3 Registry Developer
It could very well be a 454. The seller only says that it's a 1970 CHEVROLET engine. He makes no claims that it's from a Corvette. Production of full size Chevrolets and Chevelles beagn at the normal time in the fall of 1969. So, there were plenty of 1970 model cars built in late 1969, there just weren't any 1970 Corvettes or Camaros. The dates seem a little far off, but well within the realm of possibility. The intake manifold was a 1970 piece; it was not used earlier. While the block and cylinder heads were used for 1969 model engines, they were also used for 1970 model engines. So, it has all the "correct" pieces for a 1970 engine, even if the dates might be off.
This particular engine was last installed in a non-Corvette application. We know that, for sure. That's because the balancer pulley installed on the engine now (and, very likely the one that resided there during its former life) is a non-Corvette pulley. In fact, it looks to me like a crank pulley used for a long-leg waterpump application and no Corvettes EVER used a long-leg waterpump. Most other Chevrolets did, though, beginning in 1969.
While I'm sure they were producing 427's until later in the year (I have seen Nov '69 dated engines) I have personally owned two early Sept 1969 345 HP 454 engine blocks, so they were definitely producing 454's and 427's during the same time period.
Mark
Mortec and Teufert Web sites show that big block codes do not show a 454 engine being produced in 1969 regardless of model year. Production of vehicles typically began in August and September so a '454' block could have conceivably been produced in August to be installed in the '70 model cars. But then there is the issue of when did the 427 concede to the 454. Confusing but did some 3963512 427s surpass 3963512 454s in production? If so how would one know for sure?
While the 454 engine was never released in a 1969 model auto, the engines were definitely built. I've also seen several 1969 427 blocks on e-bay that were later than my 454's. I'll bet the Tonawanda plant built some 454's for the start of the model year and as the orders for 427's turned up, they were assembled as needed.
I have some doubts that the engine was originally assembled with an Aug 69 block, Mar 70 heads and April 70 intake. Likely a mix and match but who knows?
Mark
P.S. too expensive!
The last 270 block I had also had cast in clearance for the 454 crank, but if I recall correctly, the 439 blocks did not have this clearance cast in.
Mark
Well, the plot thickens as the seller says that the pad has been decked. So it is a late 427/early 454, with heads and intake dating as far as eight months past its casting date.
Re: all 512 blocks have clearance for the 454 cran
I have an A 9 block in my car also. It is not machined for clearance, but the clearance reliefs are cast into the block. The 439 blocks do not have the casting shape of the 270 and 512 blocks. I have a 439 block dated July 68 that has the clearance machined into it - I just wasn't sure if it was factory or not. My March 68 block is not machined for clearance. I also have an June 68 block but can't get to it right now (still assembled), so if the factory did machine in the first clearance slots, they may have appeared between March and July of 1968. That would also explain why they came out with the new 270 casting - it's a lot simpler and cheaper to cast in the reliefs instead of having to machine them.
Mark
Just for grins, I put a 454 crank into the E 68 block with "low perf" 3/8" rods and it just clears everything, but there's no way the 7/16" bolt rods will fit without a little grinding.
Mark
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