sbc step headers

[et7333]

How much gain,if any, would a set of 1 5/8 to 1 3/4 step headers over a set of 1 3/4 hooker super comp headers on a 383 sbc,13-1,dart iron eagle 215 platinums,super victory,comp flat tappet,.558 550,260,[email protected] 108,alky 750 carb,3100 lb camaro?

[zipper06]

I doubt very much,
this question was posed to Jerry Stahl a few years ago and he says he's rarely seen more than 1% gain from step headers and that gain is only gained when you're attempting to get good torque at the bottom of your RPM range and open up a little on the top of your RPM range. He says it not even noticable.

His opinion.

Zip.

[et7333]

Interesting Zip

[zipper06]

Interesting Zip

You can read this on Jerry Stahl's web site, i looked at his advise after considering going to 2 1/8" heads on my 434" motor that's going in my Malibu.
I decided to go to the Hooker weldup kit for 2 1/8" . Not available except from their high performance ctr. in Atlanta. I talked to a tech there and that's what he recommended.
You can find this ph# on hookers web site.

Zip.

PS, i'm running 1 7/8" Hooker supercomps in my Malibu with 377" motor now and it previously had a 406" motor in it. I also have a set of 1 3/4" to 1 7/8" step headers that i'm not even useing.

[et7333]

I don't think those headers will fit my 68 camaro

[zipper06]

The headers are not for sale i just mentioned them because i didn't install them, because i didn't think there would be any gain over the 1 7/8" headers, plus i don't have collectors for them.

Zip.

[et7333]

Did you see a gain over the 1 3/4 headers with the 1 7/8 headers?

[zipper06]

Did you see a gain over the 1 3/4 headers with the 1 7/8 headers?

I've never ran 1 3/4" headers on this car, my friend Jimmy smith with a 67 Camero changed from 1 5/8' 3" collector to 1 7/8" with 3 1/2" collector picked up 2 mph.
He weighs 3,000lbs runs a 355' motor on gas with aussie heads, purchased before RHS bought them out, and it runs 6.70's

Zip.

[et7333]

Thanks for the info Zip

[et7333]

I recently got an email from a friend that installed Dyntech MuscleMaxx 1 3/4-1 7/8 step headers on his 401 sbc,HE WAS USING HEDMAN 1 3/4 HEADERS:....Boy, did it make a difference! At SIR in Tucson, picked up .270 with about the same air as we had when I ran down there in March! Went to Firebird on Monday for a little test session and with air at about 1150' went 10.051 at 131.96. I think that is the fastest this car has been. I know the 60' was my best ever at 1.370 in this 3165 lb. slug with the small block 401 in it! EGT's were 1320 - 1352! Went up 2 jet sizes as I don't like being that close to lean!