I'm not sure where to post this. I'm putting my stripped car back together. I have a 70 w30 replacement short block that has been with the car for about 48 yrs. I pulled it out 6yrs. ago and parked it on an engine stand. I pulled the pan today to inspect it before I put it back in the car. # 4 main bearing is wiped everything else in the motor looks fresh. I'm considering selling the short block and building a 400 E block. What is an F block worth stamped
L70SB
3139 ?

 

Engine block in car when I purchased

This number matches stamping on one of the F heads
Interesting post, these are the numbers stamped on the block I pulled from my W30.

 

Had a post on here several years ago trying to figure out the odd numbers, The thinking at the time was it was from a boat or industrial use. Apologize for the hi-jack of your thread, just got excited when I saw the similar numbers on another block.

 

Those are not factory car numbers

 

Its worth the same as any other 455 block that is a rebuildable core. $100-350 depending on your area. Unless you have specific documentation tying it to a W30.

 

Unfortunately theres no "w30" block. The 455 block that would have been standard in your w30 would be the same block that would have came in your base 442. The heads, camshaft, carb, distributor, w-455 intake, etc would be the things that make it a W30, but the blocks were the same as any other 455 block. However, if your block is a 1970 block ( it will have a #3 next to the distributor hole) then it is more desirable then say a 71-72 block and generally pull a few bucks more. But as stated above, its just a standard core block.

 

This is a warranty replacement short block for a 1970 w30 4 speed.