CRG Discussion Forum
Camaro Research Group Discussion => General Discussion => Topic started by: ericisback on July 29, 2020, 11:19:26 AM
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What does the "T" or "P" by the engine block casting number signify?:
(https://i.ibb.co/sKzwH7S/CCF80442-0-BFD-4002-96-E0-200-B83743152.jpg) (https://ibb.co/jysMRtK)
Thanks for any help!
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Tonawanda.
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Tonawanda.
Well, I think the 427 came from Tonawanda too, but they have a "P" cast next to the casting number:
(https://i.imgur.com/pWp59Yy.jpg)
If what you say is correct, why wouldn't they have a "T" Stamp as well?!?
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Bergy might know for sure, but I think it's the mold ID.
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Were there any block casting differences between Truck and Passenger vehicle engine applications?
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There was a special designation for 'Performance' big blocks... HP or P?? or PERF?
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See attached. From Alan's CBTNs book.
I also learned that as a teenager from the older race crowd guys I was around a lot. And about the CFD used on some of the W motor parts we were always looking for.
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One thought is that maybe Corvette blocks had something different in the machining process compared to regular passenger blocks? I really do not know. Would be interesting to know if there was a trend. I am 90% sure that blocks for full size are exactly the same as Camaro and Chevelle.
Personally I have only seen the P on 1968 and earlier blocks. But I have no idea what exact years the P was used, when or if it ended.
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Thanks for this great info.
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There was a special designation for 'Performance' big blocks... HP or P?? or PERF? Or maybe it was Hi PERF and only for certain Corvette big blocks?
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Boys,
Isn't it alleged the 'performance' blocks had a higher nickel content?
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Years back it was thought there were high nickel blocks. I believe current thinking is that is a myth. Aftermarket blocks are usually higher nickel content.
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Years back it was thought there were high nickel blocks. I believe current thinking is that is a myth. Aftermarket blocks are usually higher nickel content.
I do know some of the brand X blocks were. So, I assumed Chevy/GM followed the same process. Guess not.
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JohnZ has posted on several occasions about the high nickel Chevy block theory being a myth.
Here's a couple of examples:
http://www.camaros.org/forum/index.php?topic=10311.msg78259#msg78259
http://www.camaros.org/forum/index.php?topic=11078.msg86361#msg86361
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JohnZ has posted on several occasions about the high nickel Chevy block theory being a myth.
Here's a couple of examples:
http://www.camaros.org/forum/index.php?topic=10311.msg78259#msg78259
http://www.camaros.org/forum/index.php?topic=11078.msg86361#msg86361
ZLP955,
Thanks for posting the reference links. Hope my next comments do not go too much off topic...
Interesting, that on the first link it mentions magazine 'test cars' were actually 'ringers'. It happened more than you think. When I spoke to the famous Jim Wanger of Pontiac fame, man did he have stories to tell. The most controversial was the GTO VS Ferrari battle. Magazines of the day said 389 cid for the Goat, however in reality it was a blueprinted 421 SD. Another one was the magazine road test 'ringer cars' on Ford's Boss 351 Mustangs.
On the second link, JohnZ mentioned the letters/numbers on the cores from the foundry. This is common on almost all brands to ID what block it references to. That again, is common practice among all brands.
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The red SS '67 Camaro that Hot Rod tested for about 6 months was another. Hot Rod admitted at their 75th ann. That the car actually had a built 427 and all the time slips were trimmed.
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I know this discussion is about the T and P but may I ask if anyone knows what the M in a square might be? I have a Flint 327 block and this water pump showing the M near the casting number.
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May be similar to the M blocks and heads:
http://www.camaros.org/drivetrain.shtml#BlockCast and scroll down to "M"-Coded Blocks header.
Seems those were evaluation castings rather than date codes, with some being released into production. I have a pair of M-codes 186 heads on my 302.