340 hp exhaust manifolds

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Snake said:
I just measured the inside of the out let it is 2 1/4,i thought it so-posed to be 2 1/2.
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The largest exit hole on any FACTORY small block cast iron manifold is just a hair over 2 1/4". Next one down is the 70s passenger 340 (1`7/8"). Some newer 360 manifolds are also 1 7/8". Even smaller are the 318 manifolds which are normally 1 5/8" exit hole. I've never had a 273 manifold but, if anything, they may be even smaller than the 318??? I've never seen any Mopar small block cast iron manifold larger than 2 1/4" (maybe 1/16" over that).
The only other small block cast iron manifolds that are the same size (2 1/4" plus) as the largest 340 manifolds are the ones I "machine" and sell (360 magnum passenger).
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Treblig
 
Treblig said:
The largest exit hole on any FACTORY small block cast iron manifold is just a hair over 2 1/4". Next one down is the 70s passenger 340 (1`7/8"). Some newer 360 manifolds are also 1 7/8". Even smaller are the 318 manifolds which are normally 1 5/8" exit hole. I've never had a 273 manifold but, if anything, they may be even smaller than the 318??? I've never seen any Mopar small block cast iron manifold larger than 2 1/4" (maybe 1/16" over that).
The only other small block cast iron manifolds that are the same size (2 1/4" plus) as the largest 340 manifolds are the ones I "machine" and sell (360 magnum passenger).
View attachment 1714974402

Treblig
Click to expand...
Most of my 318 manifolds have been 1 7/8 also. The 273 manifolds I just had were 1 7/8 also.
 
That's normal for 340 manifolds. My current set of 340hp manifolds measures just shy of 2 3/8".
 
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