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85CHEVY 05-03-2007 05:17 PM

Is this casting # known to be a good block
Hi everyone, I have almost got my engine done; should be running by Monday. Just wondering if this casting number (10066036 Hecho en Mexico) is known to be a good block. It is a 4-bolt main block.

chiss 05-03-2007 05:37 PM

according to my paper work that is an 86 Targetmaster crate engine
2pc rear seal, If its got the 993 head castings, thats a decent little
SB. It came in 2 an 4 bolt.

steveyb4342 05-03-2007 06:11 PM

This is what I found

"10066036...350...........2 or 4...Target Master/Goodwrench crate motor, 2-piece rear
seal, "Hecho en Mexico""

2 or 4 is the different mains.


junior stocker 05-03-2007 06:14 PM

I had one of those. Had less than 20k miles on it, but was 8 yrs old, when it dropped #8 exhaust valve. Still have the block and crank. Those blocks must be awfully "soft" as there was quite a ridge for the miles it had on it. Still going to use it again one day.

85CHEVY 05-03-2007 09:47 PM

Vortec heads are going on it. So it is not one of the higher nickel content blocks?

Arcuden 05-04-2007 02:03 AM

If the engine is not yet installed in the vehicle, check behind the timing cover or on the rear of the block behind the flywheel for "010" (1% added tin) or "020" (2% added nickel), or both. The numbers are big and easily noticed.

There's another thread going on here somewhere debating the benefit of having a harder block (extra nickel).

85CHEVY 05-04-2007 07:58 AM

Thanks, I'll check that out.

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