Hey guys got a good deal on a set of 15 degree pontiac ex nascar heads with matching single plane intake. My question is with using the intake for the heads what do i have to convert? does anything even need converted to do this? I read plenty on converting if i wanted to us ethe LTx based intake, but since i am not what do i really need to convert?

 

Are the heads in the pic what you are buying? If so, those heads are SB chevy, not pontiac. Pontiac heads are never gonna bolt to a LTX motor. Totally different setup.

Where's the carb or throttle body gonna go on that engine???

 

They are the old nascar Pontiac heads basically SBC heads designed for teh cup series. Th ethrottle body wont be a issue the 4" VFN hood will clear it anyway. Pretty much just for the drag car. th eheads are a SBC head as I stated,just labeled as Pontiac heads,


As you can see they are just a nice set of prepped Cup heads. prior to the SB2 design.

 

well, you need mods to the heads to run them on a LTx, lots of welding to plug coolant ports, and machining to clean welds/open ports

plus, I don't know if anyone makes headers with the Stahl pattern to fit a 4th gen chassis

 

The headers arent a problem at all. As I am looking at the old MT1 heads off my LT1 and the SBC heads i only see on port difference. Is this correct? As far as teh intake sid eof it what does it matter since i am running the intake that was with the heads to begin with?

 

the bolt pattern on the exhaust ports is a Stahl pattern, not the standard SBC one


you need to plug/modify the coolant passages in the deck surface of the heads, or you will get coolant going strait into the lifter valley

you need to plug the intake gasket surface coolant passages as well, since if you dont, you will over heat

and are you going to use the opti, or a standard dist.? if opti, you need to plug the dist. hole in the back of that intake

 

Thanks man, I am aware of teh header pattern, guy here local build custom headers. He has been there done that before on a 4th gen.

 

no prob

where did you end up getting that setup?

 

You have to convert them to reverse cool and do some other stuff along with PISTONS to make it all work.... could make some nice power though.

Hey I have some Olds valve covers for a SBC head if you want to really screw with people.

Bret

 

Ya think some at the strip would be scratching their heads to see-- A Chevy with Pontiac heads and Oldsmobile valve covers.
I can hear it now-- Must be an ex Pro Stock or something.

 

Picked the set up at a nice swap meet right near bristol saturday. As far as teh pistons yea i know they 396 assembly will need some 18* pistons and such. Will probally run the XFI injection on it.

 

I'm all for confusing the enemy.... I'd go Rocket block (Big olds "rocket" cast into the side), Pontiac heads and Bow-tie valve covers.

Those were pretty good heads in their day.

As for the headers, I think you'll find your problem when you go to bolt them on. The ports are going to be much higher in relation to the bolt locations. You'll probably either see the port above the header flange or it will be just below it.

And Dave's right... I just scrolled back to the picture and they are Stahl pattern. Hey, you'll want a custom header for this kind of deal anyways.

-Mindgame