Pontiac intake?
 

1976 firebird 400 stocker build. NHRA bluprint guide says intake manifold casting number needs to be 496140. Every other source i find says that is 1975 only and 1976 and 1977 are 525355. Also, i found a stock 1976 firebird in a salvage yard today and it had the correct 6x-8 heads and the 525355 intake. What do i do? Thanks for the help

Re: Pontiac intake?
 

For now run the 496140 intake,but yes it is a mistake on nhra's part.They also have the 1975 #'s for the two barrel as well.It should be 525355 for the 76' 4 barrel intake,and 525353 for the 76' 2 barrel intake.I am going to ask our head div tech director about it.

Re: Pontiac intake?
 

Irregardless, if the stuff can be purchased cheap enough. I'd buy it. Call your division director and get his take on this. A 1976 model would have been available in the fall of 1975. There is some possibility of model crossover. I have a similar situation with the guide regarding my 1979 Firebird. I'm looking at possibly hunting down the pieces to build a 1979 350/165(287 factored)hp Chevy engine for NHRA. On the Pontiac side they list an intake manifold #14007376. For a 1979 Malibu, same engine, they list the above manifold and an alternate #346249. Like I said, same engine, why can't I use the alternate manifold, if I could find one?

Re: Pontiac intake?
 

If and when you are invited to an NHRA "Party" as they sometimes call it , teardown, they will expect you to have what's in the blueprint guide. Period. You are correct about the 525355 manifold coming on '76 engines but save yourself some grief and go with the 496140. That's what I'm going to do. Danny

Re: Pontiac intake?
 

Thanks, guys. I think i will go ahead and pick up the 525355 and continue my search for a 496140.

Re: Pontiac intake?
 

Hey guys, when NHRA retyped the spec sheets into the new format a lot of errors were made. I would appeal to NHRA to dig out the original spec sheets and cross reference them with the new sheets. If they are the same I would ask them to supercede the correct part no.,because we all know what is the correct manifold. Thanks Bob Michael.