Offenhauser Intake Part Numbers

[WE2Regal]

Here is the picture that disappeared from post #4 above.

 

[WE2Regal]

And since this picture recently disappeared, here is some of the Inglese Weber carb intake manifold.

 

[ek02]

Thanks for reposting those photos.

 

[WE2Regal]

That Weiand 7542 probably looks pretty familiar to you Ed.

 

[ek02]

It does. I drove around with it yesterday morning. Thanks again.

 

[WE2Regal]

I thought I would post some pictures of an Offenhauser 6228c intake manifold that were lost previously on this site. I had 2 of these but decided it was time to stop hoarding and sold them. They are much harder to find than a Kenne Bell or either of the Weiand's. The Offy 6228c is my favorite intake for a stockish Buick V6. This one had a casting date of 7/18/87. It has mounting holes for a spreadbore or Holley carb. Unlike the Kenne Bell and Weiand 7541 intakes, the 6228c only fits '79 up cylinder heads and it also does not have EGR passages like both of those have. The plenum is larger than a factory 4.1 intake but much smaller that any other aftermarket intake. The floor is raised in the center and contoured towards each port. The floor is also heated by coolant but can be blocked off. If you look inside of the thermostat opening you can see a second hole. If you don't want the intake floor heated, it was designed to simply put a plug with some sealant into that hole to block off the coolant.

 

[Rod Hartzell]

I have a 1978 3.8. Seems that all 4 barrel aftermarket intakes are for 1979 & newer. I have installed a Weiand 7541, & it is running ridiculously hot. I have changed everything but the intake. Any suggestions or ideas?

 

[WE2Regal]

Before the guessing starts, please clarify something for us. Are you saying the engine ran cool before you installed the Weiand intake manifold and began running hot only after the install?

 

[Rod Hartzell]

No, this was a new rebuild, from a shop. I added the intake. It is bored .060 over. Aluminum radiator reads 150-160, intake reads 220+. 160 thermostat.

 

[WE2Regal]

Wow. That's pretty hot. How did you measure the intake temp? Is your gauge reading correctly?

 

[Rod Hartzell]

All around the front portion. New heat gun.

 

[WE2Regal]

You probably should have started your own thread on this which would have created more attention for you. It's going to be a long guessing game which also takes away from this one I started.
Because the radiator is cooling fine, it sure sounds like a water circulation problem inside the engine. Maybe it's a longshot, but being a new rebuild, I wonder if incorrect head gaskets or intake gaskets were used and the coolant passages are partiallly blocked off. Good luck.