Hello all, I am building a set of headers for my 77 Grand Prix and I was looking at images on google and I saw a set with the two center ports combined into a single tube. Has anyone used a set like this? Does it stay 3 tubes the entire length? Obviously this tube needs to be larger diameter does anyone know the tube size of this design? Is this a poor design from a performance standpoint?
Yes, that was a cheap header version like the old "Blackjack" $99 headers back in the 80's. Surprisingly they didn't fit well either despite the extra space provided by the missing tube.
I had a set at one time on a daily driver and replaced them with another cheap set of headers (Cassler) except the new set was 4 tube and fit perfectly. Performance was better with the 4 tubes while I didn't notice any difference between stock logs and the 3 tube headers.
Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.