Building headers & need advise

[Greg from Aus]

Thanks guys,

I have a RHS tall deck in an Art Morrison frame with tony Wooward rack.
The engine is a 440, mast motorsport black label heads with a Ozmo twin throttle body manifold, it's has a solid roller cam, I'm not sure of the spec's.
Projected Hp is 700 - 720 at the flywheel.

I have been mocking op the headers today using the Icengineworks system, there is not a lot of room on the drivers side. The tube is 2", and the shortest pipe is 24" to the very front of the collector.

All help is greatly appreciated.

[Ron Sutton]

Originally Posted by tonner

I have a RHS tall deck in an Art Morrison frame with tony Wooward rack.
The engine is a 440, mast motorsport black label heads with a Ozmo twin throttle body manifold, it's has a solid roller cam, I'm not sure of the spec's. Projected Hp is 700 - 720 at the flywheel.

Nice !

Originally Posted by tonner

The tube is 2", and the shortest pipe is 24" to the very front of the collector.

You don't want to measure to the front of the collector. With your collector, the individual primary tubes continue on for a several inches inside the collector assembly.

Even though you bought a collector assembly ... technically, the collector doesn't start until the individual primary tubes stop.

So, measure your collector. Measure from the "front" where the primary tubes enter ... until the primary tubes inside the collector stop. You will see a point where all four primary tubes end inside the collector. That is where the primaries end & the collector starts.

You're going to add the lengths of the primary tubes you have built ... to the length of primary tube inside the collector. Don't forget to subtract any overlap where the collector assembly slides over the tubes. (Just so you have an accurate & true length.)

When you figure this out ... post again with the primary tube lengths.

Before, when I didn't know what you had for an engine ... I was "assuming" you had an LS or SBC putting out 450-550 hp. In that case, 27" primaries was my suggested minimum length.

Now, knowing more about the engine you have, I "think" your optimum primary length will be around 27". You could go a little shorter if you need. I say, I "think" because I don't have all of your engine info.

I'd be happy to help you work out the optimum header dimensions ... and optimum exhaust system for you, but you're going to need to provide me with a LOT of specific engine data. Just let me know.

[Greg from Aus]

Originally Posted by Ron Sutton

Nice !




You don't want to measure to the front of the collector. With your collector, the individual primary tubes continue on for a several inches inside the collector assembly.

Even though you bought a collector assembly ... technically, the collector doesn't start until the individual primary tubes stop.

So, measure your collector. Measure from the "front" where the primary tubes enter ... until the primary tubes inside the collector stop. You will see a point where all four primary tubes end inside the collector. That is where the primaries end & the collector starts.

You're going to add the lengths of the primary tubes you have built ... to the length of primary tube inside the collector. Don't forget to subtract any overlap where the collector assembly slides over the tubes. (Just so you have an accurate & true length.)

When you figure this out ... post again with the primary tube lengths.

Before, when I didn't know what you had for an engine ... I was "assuming" you had an LS or SBC putting out 450-550 hp. In that case, 27" primaries was my suggested minimum length.

Now, knowing more about the engine you have, I "think" your optimum primary length will be around 27". You could go a little shorter if you need. I say, I "think" because I don't have all of your engine info.

I'd be happy to help you work out the optimum header dimensions ... and optimum exhaust system for you, but you're going to need to provide me with a LOT of specific engine data. Just let me know.

Thanks for the info Ron,
I re measured and it is 28".

I don't have all the engine specs as it's being built at the moment.

[Ron Sutton]

Originally Posted by Greg from Aus

Thanks for the info Ron,
I re measured and it is 28".

I don't have all the engine specs as it's being built at the moment.

2" x 28" will be right in the ballpark for a engine like this making 700-720 HP.

Best wishes.

[Ron in SoCal]

Hey Greg great pics, car is coming along beautifully. With my similar set up minus the Woodward rack, the passenger side is cake. The driver side is a different story. From your pics, it looks like your steering shaft mount location on the rack exaggerates this as well and forces the header mods? Same boat here...

My options are to either get a Borgeoon triple joint coming off the rack, or mod a tube (or both). I could also go to a multi-sectioned steering shaft, but that's not preferable.

[Greg from Aus]

Originally Posted by Ron in SoCal

Hey Greg great pics, car is coming along beautifully. With my similar set up minus the Woodward rack, the passenger side is cake. The driver side is a different story. From your pics, it looks like your steering shaft mount location on the rack exaggerates this as well and forces the header mods? Same boat here...

My options are to either get a Borgeoon triple joint coming off the rack, or mod a tube (or both). I could also go to a multi-sectioned steering shaft, but that's not preferable.

Hey Ron,

Because mine is a tall deck block and the Woodward rack, there was nothing I could do but make a set, and I really am enjoying the challenge.