RS block worth getting?
 

Hi all,
I recently talked to a guy who says he has a '74 RS block sitting in storage that he's waiting to get rid of because he needs the money. I have yet to see the block but he wants $100 for it. I will definitely check the number on it and confirm with you all whether or not it's a RS block. I figured it's worth it RS or not just because it's a Porsche block for $100. I just bought a $200 carpet set(entire car) so I have done business with this guy. Old gentleman, doesn't seem like a liar. Any suggestions? Thanks!

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Jeff
1976 911S

Jeff,
The RS blocks, and by extension the '74-'76 2.7 Carrera blocks have a part number that ends with "7R". If it ends with "4R", it's a 2.4 block.
Heck, any block still useable is worth 100$
Regards, George

Jeff,
The RS blocks, and by extension the '74-'76 2.7 Carrera blocks have a part number that ends with "7R". If it ends with "4R", it's a 2.4 block.
Heck, any block still useable is worth 100$
Regards, George

Jeff,
The RS blocks, and by extension the '74-'76 2.7 Carrera blocks have a part number that ends with "7R". If it ends with "4R", it's a 2.4 block.
Heck, any block still useable is worth 100$
Regards, George

Ooops, sorry. I fell asleep on the button...
GeorgeK

There are two different versions of the 7R block, the 2.7 version which is identical to any other 2.7 with cylinder spigots for 90 mm cylinders, and the 2.8 version bored for 92 mm cylinders, but with the cylinder stud spacing distance/pattern of later 3.0 engines.

The later version certainly has value to vintage racers, but not much value to regular guys, as heads compatible with it are scarce! Bruce Anderson's 'handbook' has the details to identify which version of the 7R it is, if indeed, it is from an RS.

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Warren Hall
1973 911S Targa

Thanks George and Warren,
I will go read Bruce Anderson's handbook and make sure it's a RS block when I go look at it. If it's a 2.7 RS block would I be able to use it? I strongly doubt it's a 2.8, but George you're right I figured a block for $100 RS or not is probably worth it. Thanks!

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Jeff
1976 911S