Correct me if I'm wrong

[Chevy nutcase]

Cruising the depths of marketplace for a local small block for a rebuild and I saw this. Ad says it's a 350 from an 80s pickup and I wondered why there was only 1 accessory hole in the heads. Then I saw the backside and I'm guessing they swapped sides with the heads for whatever reason or is there a breed of cylinder heads that are supposed to be like this? It's been a while since I rebuilt an engine

[Warrens69GMC]

I believe that came from a 86-87 truck or van. 1pc rear main seal, 193 heads and 210hp.

[Chevy Fleetside]

That is an 86 to 92 350. You will need to use an electric fuel pump. During casting they blocked off the fuel pump hole. I know the BB of that time did not. I have an 87 engine and this is how I know. Also the center bolt valve covers.

[Warrens69GMC]

Originally Posted by Chevy Fleetside

That is an 86 to 92 350. You will need to use an electric fuel pump. During casting they blocked off the fuel pump hole. I know the BB of that time did not. I have an 87 engine and this is how I know. Also the center bolt valve covers.

86-89 you could still get a mechanical fuel pump in the R series. It needs to be checked if wanting to run the mechanical pump.

I say its 86-87 because it doesn't have the lifter valley bosses cast into it.

[SCOTI]

Originally Posted by Warrens69GMC

86-89 you could still get a mechanical fuel pump in the R series. It needs to be checked if wanting to run the mechanical pump.

I say its 86-87 because it doesn't have the lifter valley bosses cast into it.

x2.

[MikeN]

As far as I know there has NEVER been unique left or right cylinder heads for any SBC. They all fit either left or right. On a used engine it's always possible one of the heads has been swapped for a different casting number or model year.