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It sounds like you miss read the firing order that’s casted on the intake. The block casting number is on the flange where the bellhousing or trans bolts up
To the OP: The casting number below is for an aluminum 283. The casting number you posted is later than this but not late enough to be a 4" bore block. Is there any chance your block is made of magnesium?
REX: Due to a disk crash I've lost all the pictures of your magnesium blocks. Can you confirm the OP's casting numbers as being for magnesium?
Last edited by jim lockwood; Nov 28, 2020 at 04:46 PM.
Jim, Do not believe the block is magnesium. Trying to find out what it was originally, like I said it has RF as the last two letters stamped in the front which means it is some type of corvette engine. Trying to find out info for a friend I do not have the block.
Jim, Do not believe the block is magnesium. Trying to find out what it was originally, like I said it has RF as the last two letters stamped in the front which means it is some type of corvette engine. Trying to find out info for a friend I do not have the block.
Wayne,
You'll get much better information about that block if you post some pictures. Can your friend make and send you some?
Production engines used the "RF" suffix to signify fuel injection. However with this block having a "0-" casting number, it's not a production engine so you shouldn't read too much into the RF just yet.
Verne,
I can imagine seeing some "0-" parts on, say, pilot line cars. Is that the kind of usage you've got in mind?
Jim
Yes. Pilot cars would qualify. I also know of several "0-" parts that separately were funneled to racers prior to the final production versions being available to the public. I realize they don't qualify as "production releases".
I've also documented a '64 Pilot car that was actually sold to the public with prototype types parts on it that were never released for production, but that's another story.
To the OP: The casting number below is for an aluminum 283. The casting number you posted is later than this but not late enough to be a 4" bore block. Is there any chance your block is made of magnesium?
REX: Due to a disk crash I've lost all the pictures of your magnesium blocks. Can you confirm the OP's casting numbers as being for magnesium?
Hi Jim,
I hope you're doing well.
Sorry for the late reply, I just now saw this. These are photos of my NOS magnesium block. As you can see, it carrys the same casting number AND date on the drivers side as do the the aluminum blocks. However, the mag blocks have a second casting number on the passenger side. I'm not sure why GM didnt change the casting date for the mag blocks. I do have authentic documents from the GM archives confirming Oct. 1962 shipments of aluminum blocks and heads and mag blocks to Mickey Thompson. I suspect this was in preparation for his 1963 Indy 500 cars.
I also have another mag block with the same casting number on the passenger side, but the driver side number was ground off and Mickey Thompson stamped in its place. Mickey Thompson is also stamped on the front of the block.
I "suspect" but cannot say with 100% certainty this block was used in one of Mickey's Indy cars.
