Any idea what kind of heads these are?

[LTZ C20]

Correct about the the chambers, lower the chamber size, higher the compression ratio. Thats because there's less area for all that air and fuel to be squeezed into.

Camel hump heads are from what I have heard, considered pretty great old school cast iron heads. But since it doesn't have the casting mark that is referred to as the "camel hump", I'de say it's uncurtain they are hump heads or 1 of the 2 that go with the tetris shape that you did find on them.

[c10dude75]

Yeah usually hump heads or at least the 1s iv seen don't have accessory holes in the front so I don't think their humps. Got to be 1 of those L shaped 1s but the last 3 numbers matches the humps according to that chart unless it's missing numbers and stuff.

[Irish_Alley]

double hump heads dont have accessory holes but they can be drilled for them

[HAULIN IT]

There are double hump heads with the raised areas & bolt holes. They started in late '68 or '69 when the long waterpump setup came to be in the Camaro, ect.. The Vette's still used a short waterpump, but had bolt hole heads as well from what I've read.
To the OP, to me, it looks like you have the head that has been outlined in the Red Square. Definitely not the double hump heads. Over the years I've found MANY flaws in the published numbers vs. what a person has in their hand (example, Years ago in print was that all 010 blocks were 4 bolt main...maybe started out that way, however there were MANY 2 bolt 010 blocks. I've found similar situations with heads as well)
Lorne

[c10dude75]

Very interesting. So I guess what would be a nice up grade from what I got? Also how much hp you guys think this turd 350sb might make? It's got a edelbrock torker intake and summit 4 barrel I think 600cfm and full length headers and Tetris heads now lol dunno what came it got or anything else just curious to know in a ball park of what it would have.

[outlaw70nova]

186's are very decent heads. They are an upgrade of the old camel hump heads. You can make some good power if they are 2.02's with some port / bowl work done to them.

Small “camel hump” c/n 186, 492. Later high performance or “fuelie” heads, some c/n 186 (1969 and later) and all c/n 492 have accessory bolt holes. Either 1.94" x 1.50" or 2.02" x 1.60" valves, 64cc nominal chamber volume.

[c10dude75]

What about a modern style head?for a decent price?

[Captkaos]

Vortec heads in my opinon are much better than the heads of old, BUT they require a new intake.