427 block worth?
 

Looking for a 1966 427 block, what's ideal price without overpaying? 2 bolt main.

I guess I should post numbers. I can get them tomorrow.

Are you talking a stamped C2 427 block or an unstamped or wiped clean Chevy two bolt 427 block?

The casting numbers would affect price, as would completeness and condition.

A 942 block in a usable shape will sell north of 5k more or maybe less depending on what’s on the stamp pad

C1 941 is what it says

Is this a small block?! C1 stamp weren’t big blocks were they?! It was sold to me as a 1966 427 2 bolt main

Any 942 block you find I’d have extensively pressure tested, leak tested, and seems like it was ultrasonic (not sure)? My experience is a 942 block from late 1965 thru mid-66 just sitting around has a high probability there’s a reason. I bought a casting date correct 4-bolt that was inspected and we still found an issue. For me stamping was irrelevant. It was the casting date I wanted correct. You may not care but I found a block that was cast, I think within 6 weeks of my early April build. The ask was over 4K and I talked him down to 3200. It had evidence of a racing history. No surprise. Be careful. These blocks are very scarce and usually abused.

There's a guy on eBay that has some for $3900. I guess it depends on what you want and are willing to pay. For me and being a nom I would use a 454 block and never look back,$500-$600.

A 961 is a 396 ci. Check bore size

enginelabs.com has this posted...

3855961 Big Block V8 1965-1966 396, 2 bolt or 4 bolt

3855961 Big Block V8 1966 427, 2 bolt

So, which is it, how do you determine from here?

I would say 99% left Tonawanda as a 396 block with use in a Chevelle or Impala

I started out in engine building in 74. So these were much more common, I was always told that the blocks with no dowels for the timing cover could be either 396 or 427. There was no internet and no way to verify. There are certainly some on here that would know. I do know that a lot were bored to 4.250 whether it was right or not.

I'm still a bit confused, is this going into a C1, or a C2?

If it is going into a C1, is there a reason you need this specific block? After all a big block in a C1 would not be correct for judging, so which 396/427 block you start with shouldn't make a significant difference.

Can you post a picture of what you have and the car it is going into?

Good luck and welcome to the Corvette Forum... :thumbs:

GUSTO

There's no car, just the block, its stamped with a C1 though.

Stamped or embossed? And where are you seeing it?

https://cimg9.ibsrv.net/gimg/www.cor...90a2b7c66.jpeg

That is I think a foundry mark for the pattern mold

Is there no way to find out 100% 396 or 427? I bought it as a 1966 corvette 427 2 bolt main block.

Did you measure the bore of the pistons? Is there any thing stamped on the pad. I would say you bought a 396 block