slant six exhaust manifolds
I have read an awful lot of data either conflicting or confusing ( for me ) concerning the later slant exhaust manifolds.
I have seen first hand Super six engines in the salvage yard pilfered for parts only to leave the exhaust manifold behind cause the guy removing the parts said that all later manifolds are the same.
I have collected a few manifolds
now and am doing some comparisons. Maybe you can see differences with the picture of the outlet diam.
These manifolds pictured above have exhaust outlet diameters in sizes ( from top to bottom )
1 15/16
2 3/16
1 15/16/2ish Closer to 2 depending on where measuring instrument is held, all of these manifolds have a certain degree of out of round
And lastly the one that is still attached to the head I just removed which reads in at 1 15/16
What gives with these variations of sizes? I have read that Super six had a larger exhaust outlet ( 2 1/4 ) I have yet to see this manifold and I have measured a few Super set-ups.
If there is a 2 1/4 outlet manifold than are the intake exhaust ports a larger size as well? I would assume not since there was not a special Super six head.
Can a smaller diam exhaust manifold ( one of the 1 15/16 jobs ) be opened up at the outlet end to the 2 1/4 size and then blended back up into the manifold.
I dont see why not but I have to question if the effort would be worth the outcome....evidently it must be if there truly is a special Super six manifold.
I ask these questions also cause the one manifold I have that measure 2 3/16 ish is in very poor shape, it looks like someone tried cutting off the studs with a heatwrench and scathed the collector mating surface pretty badly in two areas
Also this manifold is pretty badly warped which can be seen with the straightedge.
I have another manifold that is alot straighter that I would prefer to use
According to Docs manifold instruction ( over on slant.org ) sheet 1/8 of a difference between first and last runner is about the maximum amount for a user. I am pushing those limits on my best manifold.
There is quite a bit of meat there Id like to know why I couldnt split the differences with my de-burring bits and make some of these manifolds more use-able. Can someone explain to me why this would not work?
I have read an awful lot of data either conflicting or confusing ( for me ) concerning the later slant exhaust manifolds.
I have seen first hand Super six engines in the salvage yard pilfered for parts only to leave the exhaust manifold behind cause the guy removing the parts said that all later manifolds are the same.
I have collected a few manifolds
now and am doing some comparisons. Maybe you can see differences with the picture of the outlet diam. These manifolds pictured above have exhaust outlet diameters in sizes ( from top to bottom )
1 15/16
2 3/16
1 15/16/2ish Closer to 2 depending on where measuring instrument is held, all of these manifolds have a certain degree of out of round
And lastly the one that is still attached to the head I just removed which reads in at 1 15/16
What gives with these variations of sizes? I have read that Super six had a larger exhaust outlet ( 2 1/4 ) I have yet to see this manifold and I have measured a few Super set-ups.
If there is a 2 1/4 outlet manifold than are the intake exhaust ports a larger size as well? I would assume not since there was not a special Super six head.
Can a smaller diam exhaust manifold ( one of the 1 15/16 jobs ) be opened up at the outlet end to the 2 1/4 size and then blended back up into the manifold.
I dont see why not but I have to question if the effort would be worth the outcome....evidently it must be if there truly is a special Super six manifold.
I ask these questions also cause the one manifold I have that measure 2 3/16 ish is in very poor shape, it looks like someone tried cutting off the studs with a heatwrench and scathed the collector mating surface pretty badly in two areas
Also this manifold is pretty badly warped which can be seen with the straightedge.
I have another manifold that is alot straighter that I would prefer to use
According to Docs manifold instruction ( over on slant.org ) sheet 1/8 of a difference between first and last runner is about the maximum amount for a user. I am pushing those limits on my best manifold.
There is quite a bit of meat there Id like to know why I couldnt split the differences with my de-burring bits and make some of these manifolds more use-able. Can someone explain to me why this would not work?