Exhaust Manifolds

[Rondecurtins]

I want to identify these exhaust manifolds. I cannot read the casting numbers, maybe because of the coating on them. Are they from a 62, 63 or 64?

 

[427John]

I'm no help with the year on these, but have a question, has anyone determined how much power these are worth over the shorter 2.5" outlet 340 horse 409/409 truck/348HP manifolds? I'm sure there is some just curious how much on a 409 or 425 horse engine.

 

[our1962]

They look like 63 409 425hp

 

[our1962]

Image from my 63 409 425hp

 

[409newby]

I’am only seeing the passenger side

 

[Murphdog]

Any chance they are SC repops? I say this because they use a stainless block off plate on the heat riser cavity. Any original GM one this is rusty,
Jeff

 

[pvs409]

Original 62 manifolds were sold as a service package in 1962 -serial numbers ended in 923 & 924
63 and 64 - 425 HP 409’s - serial number ended in 925 & 926

 

[Murphdog]

Below is a SC repop. "Casting logo looks the same. Same stainless looking heat riser cover???
Jeff

 

[Rondecurtins]

No these manifolds are not from SC. The original heat riser covers were rusted so I did get the new heat riser covers from SC. I had them bead blasted and, replaced the threaded bolt studs and had them coated.I know that I had the casting numbers written down but of course that seems to be the only piece of paper I have not been able to find. Once they were coated I can't read the casting number
Here is the reason I would like to be sure of the manifold year. My 62 has a 63 motor in it. I want to order a repro exhaust system (maybe from Classic Industries) and their catalog shows a different system for the 62 409 and the 63-64 409.
If the manifolds are 63-64 I will have to determine if that exhaust system will fit okay on my 62 frame.
Thanks to all of you for your input.

 

[our1962]

It will probably fit the frame either one you choose, the part that will not fit is the down pipe from the exhaust manifold to the exhaust system. That will have to be made local or cut.

 

[Don Jacks]

Those are 63-64 hp manifolds.The 62 production manifolds were thE 2 1/2 ''centerDump'' style,hence the differEnt head pipes.The 63-64 340 horse manifolds and th 62 maniifolds and should take the same pipes,If so the 63-64 hp pipes should fir a 62 equipped with the 63-64 hp manifolds.

 

[pvs409]

I would consider buying from Shafer Classic Reproductions directly or from Show Cars in Minnesota
I used a aluminized set on my big tube late 62 and 63/64 409 exhaust manifolds from Show Cars with stock mufflers on my 1962 409 convertible

Exhaust - Exhaust Systems - Complete

Exhaust - Exhaust Systems - Complete

shafersclassic.com

Schafer lists only one 409 system for the big tube later manifolds on 62 or 63 (All 61-64 convertible frames are the same)
Paul

 

[Toms63SSQB]

The part that will not fit is the down pipe from the exhaust manifold to the exhaust system

Available from Showcars, mandrel bent.

 

[our1962]

Available from Showcars, mandrel bent.

Yep, they order the down pipe from Shafer in Tampa Florida

 

[R63ss]

They are 63-64 925/926 manifolds
Gardner exhaust offers 409 exhaust kit for 63-64 with 925/926 exhaust manifolds
Fits like a glove

 

[Rondecurtins]

Thanks to all of you for your comments. I now understand the difference between 62 and 63-64 manifolds. Now I will order the correct exhaust system for my car.