Technical Gm bowltie heads

Are gm bowltie heads have raised exhaust ports trying to make shure trying to find header that will work


The problem with the header they don't fit angle plug heads Un less they are raised ports

 

Oldfart I'm not exactly sure but I don't think so. I had a set on my MG once and the headers fit both the angle plug and straight plug old fuelie heads. And the headers wound up in the same place ch***is wise.

Pat

 

Ok that what I thought they were stock locations

The trouble I'm having can't find header to fit in my Ch***is with angle plug heads

 

I always thought the angle plugs helped on the header clearance.
Shouldn’t normal headers fit angle plug heads also ?

Tommy

 

Not on my Ch***is it in a s10 Ch***is what the headers are designed they hit the tubes

 

Angle plug heads and header interference has been a problem since angle plug heads were introduced. There are short plugs on the market that I have heard used in this situation. Though I can't help with brands or part numbers.
Also it has been shown that a well placed dent in the offending tube won't hurt performance.

 

Eccel (sp) spark plugs made those short plugs...

 

Yes I was told but my headers I have are to small for my motor

Have a 406 with a .513 roller camshaft and 9.5 compression
The header I have are 1 1/2 tube and 2 1/2 flange

They quit making the the header I want they are 1 7/8 and 3 1/2 outlet

The only thing I fond is fenderwhell hearder

 

I don't know all the particulars of your engine but it should be well supported with 1&3/4" headers, which will bolt directly to your heads, as far as I recall most 1&7/8" headers require adapters.

 

69490 headers should work