what engines exhaust manifolds interchange with a 307
December 8th, 2009, 06:30 PM
#1
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what engines exhaust manifolds interchange with a 307
im trying to figure out what motors 260, 350(gas/diesel) 403, 425, 455 have manifolds that will interchange with a 307, and which if any of them dont have a crossover pipe setup, which would enable me to do a dual setup
its a 1984 oldsmobile delta 88 307 small block 5a heads
its a 1984 oldsmobile delta 88 307 small block 5a heads
December 8th, 2009, 06:41 PM
#4
Yes but any that exit in the middle will not work on a Delta. The mani exits right at the motor mount.
I was going to buy a set of headman shotry headers for a 76 Cutlass for mine, but the car was totaled first
I was going to buy a set of headman shotry headers for a 76 Cutlass for mine, but the car was totaled first
December 8th, 2009, 06:46 PM
#5
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damn im sorry to hear that, umm i have another question if you dont mind, on the airhorn (i think its called) in front of the primaries on the carb, is an adjustment screw for idle air bleed i think, well my o2 sensor failed (crappy bosch o2) now i got a real ac delco, my air/fuel mixutre gauge is reading almost lean at idle, i tried to richen the air bleed but im not sure where the sweet spot is, like how many turns in or out, since you used to have a delta with a 307 i figured you might know the proper adjustments
December 9th, 2009, 06:50 AM
#6
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Let's clear this up a little. All 1964-1985 Olds motors use the same exhaust flange. The roller cam 307s have the same bolt pattern but smaller ports and use a unique gasket. Of course, these are the tubular stainless manifolds and should be avoided at all costs.
ALL RWD small block manifolds have a crossover. Dual exhaust cars (W-31s included) simply capped the crossover port on the passenger side manifold. Yes, there are aftermarket "dual exhaust" manifolds for the SBO. Having looked at them closely, they do not appear to be any different from stock manifolds except that the "cap" is cast in. At the price they are going for, you need to decide if that is worth it to you.
BBO manifolds, particularly W/Z will bolt to SBO heads but WILL NOT FIT with the motor installed in the car. The BBO manifolds are taller and use the extra deck height to improve flow in the manifold.
Only the 1981-1990 SBO manifolds have a bung for the O2 sensor if you need that.
ALL RWD small block manifolds have a crossover. Dual exhaust cars (W-31s included) simply capped the crossover port on the passenger side manifold. Yes, there are aftermarket "dual exhaust" manifolds for the SBO. Having looked at them closely, they do not appear to be any different from stock manifolds except that the "cap" is cast in. At the price they are going for, you need to decide if that is worth it to you.
BBO manifolds, particularly W/Z will bolt to SBO heads but WILL NOT FIT with the motor installed in the car. The BBO manifolds are taller and use the extra deck height to improve flow in the manifold.
Only the 1981-1990 SBO manifolds have a bung for the O2 sensor if you need that.
Last edited by joe_padavano; December 9th, 2009 at 06:51 AM. Reason: Typo
December 9th, 2009, 07:01 AM
#7
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Let's clear this up a little. All 1964-1985 Olds motors use the same exhaust flange. The roller cam 307s have the same bolt pattern but smaller ports and use a unique gasket. Of course, these are the tubular stainless manifolds and should be avoided at all costs.
ALL RWD small block manifolds have a crossover. Dual exhaust cars (W-31s included) simply capped the crossover port on the passenger side manifold. Yes, there are aftermarket "dual exhaust" manifolds for the SBO. Having looked at them closely, they do not appear to be any different from stock manifolds except that the "cap" is cast in. At the price they are going for, you need to decide if that is worth it to you.
BBO manifolds, particularly W/Z will bolt to SBO heads but WILL NOT FIT with the motor installed in the car. The BBO manifolds are taller and use the extra deck height to improve flow in the manifold.
Only the 1981-1990 SBO manifolds have a bung for the O2 sensor if you need that.
ALL RWD small block manifolds have a crossover. Dual exhaust cars (W-31s included) simply capped the crossover port on the passenger side manifold. Yes, there are aftermarket "dual exhaust" manifolds for the SBO. Having looked at them closely, they do not appear to be any different from stock manifolds except that the "cap" is cast in. At the price they are going for, you need to decide if that is worth it to you.
BBO manifolds, particularly W/Z will bolt to SBO heads but WILL NOT FIT with the motor installed in the car. The BBO manifolds are taller and use the extra deck height to improve flow in the manifold.
Only the 1981-1990 SBO manifolds have a bung for the O2 sensor if you need that.
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