55.2-59 57 GMC 550 370 V8 exhaust gaskets

[prateroad]

Might be in the wrong place but does anyone know where I could get a set of exhaust gaskets for this truck. My research says it's a 370 Pontiac or Olds engine.

[geezer#99]

That’s one mean looking truck!
Pop the hood and devour all the Prius’s on the road!

Contact Bob.
He might have what you want.
It’s a Pontiac by the way.

https://www.bopparts.com/1957-pontia...asket-set.html

There are others too.

https://butlerperformance.com/i-2445...9498-sh-1.html

[mr48chev]

My education for the day. I knew that the smaller trucks ran Pontiac V8 engines but this says that there should be an Olds engine in that truck. Only used in those larger trucks according to this info https://www.jalopyjournal.com/forum/...re-371.606092/

They should look like this https://www.ebay.com/itm/15274972038...C_6h4k297cm0UI These are correct for 57/58.

[geezer#99]

Post a pic of the motor.
Always visual clues to decide what it is.

[mr48chev]

Originally Posted by geezer#99

Post a pic of the motor.
Always visual clues to decide what it is.

That would be a good idea as you don't know what someone might have done on a work truck of that era.

[prateroad]

I think I found some at local parts store, we'll see when they come in. Had to cancel order, asked parts man and he said center manifold bolt holes are horizontal, mine are vertiical. Everything I saw on fleabay for a 370 has horizontal holes. I might have to make my own.

[geezer#99]

C’mon, don’t tease us!
Where’s the engine pic?

[prateroad]

Well, I see it on my end.

[geezer#99]

Any info I found since last post says it’s a Pontiac 347.
Try that for gasket matching.

[dsraven]

if you could draw a rough outline of what your manifild gasket may look like that may help. if it has had a leak for quite some time the gasket surfaces on the manifold or head may have been eroded. when you get to it, ensure to lay a straight edge on the gasket surfaces of the sealing areas to check for warpage. if you cant find a gasket you can always make one from the right gasket material.

[dsraven]

the gm heritage center may be able to tell you what the truck originally came with for options etc and engine size. dunno if that would help.

[dsraven]

is the 347 and 370 not the same engine family? heads and manifolds would interchange so gaskets would be the same then?

[mr48chev]

Your engine is indeed Olds based rather than Pontiac.

This is a photo of a 57 Olds 371 engine in a 57 Olds.

The smaller trucks had Pontiac based engines but the 550 and larger had the Olds based engine.