mismatched exhaust manifolds?

GoldOlds · 05-26-2007, 10:07 PM

I just noticed that the exhaust manifolds on my Cutlass have different ID codes. The driver's side has a big "1" at one end and a series of about seven numbers in the centre. The passenger side has a big "4" at one end and that's it. Should these exhaust manifolds be on the same engine? I'm guessing the car originally had single exhaust (it now has dual 2.25" exhaust).

- GoldOlds

2blu442 · 05-27-2007, 01:14 PM

The number 1 and 4 manifolds were used together for several years on 350 engines so I think your OK with that. It's good that it was changed over to dual exhaust though, that will help it breath better than the crossover pipe and a single out the back.

05-26-2007, 10:07 PM	#1 (permalink)
GoldOlds Senior Member Join Date: May 2007 Location: Chatham-Kent, Ontario Posts: 117	mismatched exhaust manifolds? I just noticed that the exhaust manifolds on my Cutlass have different ID codes. The driver's side has a big "1" at one end and a series of about seven numbers in the centre. The passenger side has a big "4" at one end and that's it. Should these exhaust manifolds be on the same engine? I'm guessing the car originally had single exhaust (it now has dual 2.25" exhaust). - GoldOlds

05-27-2007, 01:14 PM	#2 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 936	The number 1 and 4 manifolds were used together for several years on 350 engines so I think your OK with that. It's good that it was changed over to dual exhaust though, that will help it breath better than the crossover pipe and a single out the back. __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

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