Technical Small block identification help

Guys..... I have a weird one (to me anyway) I bought a 65 Impala knowing the engine was not a numbers motor, but it’s driving me crazy trying to confirm what it is.

Casting is 3849852 which point to 283.

Block code is FOI2ID which says spec high performance 1966 327.

What on earth is sitting in the frame rails of my car?!!!! I’ll take any advice I can get.

Thanks,
Ryan

 

Pics of what I’m seeing

 

Did you find the casting date on the back of the block?

Sent from my Trimline

 

All SBCs came from vettes

 

Looks like a good set of heads
May want to pull them and measure the bore

 

All small blocks are 400’s. It looks like it has double hump heads on it.


Sent from my iPhone using The H.A.M.B. mobile app

 

Yep

 

Hahahahaha so I hear

 

It does have double humps

 

Haven’t pulled heads but boroscope does confirm dome tops hiding in there.

 

Yep

 

Do the heads have screw in studs?

 

You have a rebuildable engine.
Grind all the numbers off and then tell everyone it's a experimental engine GM let slip out the door.

 

Its a 283. I can tell by the rib in the picture showing the numbers stamped on the pad. If you can catch your finger in that rib its a 283. one exception the 67 283 had the same small rib as a 327. Those heads likely are not the desirable 300 hp 327 heads. most likely a truck head. pull a valve cover & get casting numbers of f the heads

 

However those Bacturin camel hump heads have a lot of space between the humps and the rectangle they set on is longer and narrower than the genuine article. They just don't look correct? Possibly some one altered a set of power pack heads ?

 

283 is what I’m thinking too. The block code threw me off

 

Touché good sir

 

Haven’t gone that far yet. Just got a hold of the car and started to identify what is really here

 

I’m still curious as to what this block is. Knowing when I bought it that’s it’s non numbers, I’ll throw vortecs on it and be content. The heads will become shop art.

 

They look like late ‘186 or ‘492 heads. Those have the camel humps cast almost right at the deck of the head, not on a rectangle. Can’t see it in the photo but does that passenger side head have a 3/8-16 bolt hole for an accessory mount?
If ‘186’s I think they could be either 1.94 or 2.02 intakes. If ‘492’s they would be 2.02’s with screw in studs and guide plates. But 2.02 valves interfere with the small bore 283.

 

I just checked the “ D” suffix here, it either started life as a 283/170 in a 1960-‘62, or a 283/185 from a ‘58-‘59.
And your latest photo confirms that they are likely 1.94 valve ‘186’s.

 

Huh?????....

 

Domes are good!!.....

 

The old school period correct 327 camel hump heads never had any accessory bolt holes in them. I have some in my hoard . both kinds the 194 and 202. On a 283. 602 casting 305 heads work great they are small chamber and set up for unleaded fuel.

 

Accessory bolt heads, 1969 and later, I had a set of 2.02's that were the "186" version, but the same castings could also be 1.94's.

 

They look like 186s....

 

Nobody mentioned they had to be period correct, the question was could we assist in identifying what he has.

 

Might be poked out to 301/302 cubes....