Dougs headers with 2" tubes

[Moms68]

I am building a 440 for my 68 Charger. It is a 9.5-10 compression motor with:

.030 over Icon IC9953 pistons
Eagle H beam rods
Comp cam 21-224-4 hydraulic cam
Hughes lifters
440 Source heads- mildly worked (cleaned up)
Edelebrock Performer RPM with a 780 Quick fuel carb
727 with 2200 stall converter

This will be a street car fun cruiser.

Would the Dougs D452 headers will 2" primary tubes be too large for the motor?

 

[PurpleBeeper]

I would say “yes”. They won’t hurt, but maybe a smaller primary tube would be better

 

[gkent]

Too big. And actually they WILL hurt.

 

[Moms68]

Too big. And actually they WILL hurt.

So 1-7/8" or down to 1-3/4"?

 

[steve340]

Street use typically go smaller tubes for best torque and you will only lose a small amount of HP up in the higher RPM.
Size the header for were the engine will spend most of it's life.

 

[WileERobby]

I've run 2" but for a higher modified engine than yours. I'd go 1 7/8", 3" collectors, into a 2 1/2" system, in case you decide to improve in the future.

 

[gkent]

I run 2" also ... on a 526 stroker with .600" roller.

A .030 over 440 with 440Source heads is basically a stock motor with a bit of a cam. Personally I think you'd be better off with the smaller header.

See if you can find an antiquated version of Desktop Dyno for free and run the combo through it.

 

[BSB67]

Do you already have the headers?

 

[33 IMP]

I've run two inch headers on a small block, along with a 3 1/2 mufflers and exhaust system. Didn't work at all. Kept the car from running any faster than nines, thru the mufflers. (Heavy dose of sarcasm).
A 2 1/4 might be too large, a 2 3/8 probably is. I'd run the 2" without a second thought.

 

[Moms68]

Do you already have the headers?

Not yet

 

[Mopar Hunter]

Summit Racing has Doug‘s headers on sale. Grab a 10% off coupon, and it sweetens the deal.

 

[33 IMP]

Every, EVERY header test I've ever seen, too small a header hurt much worse than a too big one. And the last header test I saw that had a clearly-too-big header, it took a 2 3/8 header to be too big on a warmed-up 454 Chevy. 2 and 2 1/4 were a push, and 1 7/8 was too small, and a 1 3/4 was a pathetic joke. (Minus about 30 hp).

 

[Charlie Brown]

I've got the same headers on a 426 W - similar combo as you and it's got tons of torque. Doug's has nice stuff, well made and generally fit good. I don't think they offer a 1 7/8 primary for your car, but I may be wrong. I don't think 2 inch is going to hurt you.

 

[Gunner1]

I have the 452;s on my 63 Polara 440 with a 750 dp on a RPM, CNC Stealths, Isky 292-242@50 108LSA. Flat tops with .039 gasket. 3000 stall and 2.94 gears. So yes it’s not a beast with these gears. But hit the pedal hard and 1st is a smoke show. Great fit with p/s.

 

[Moms68]

Summit Racing has Doug‘s headers on sale. Grab a 10% off coupon, and it sweetens the deal.

Well that's the opportunity I'm thinking about taking advantage of right now. Looking at about 750 delivered vs. over a grand for TTI's. Just trying to justify the extra money if I won't see much of a difference. Thanks to all.

 

[33 IMP]

I would prefer the 2" Doug's over 1 7/8 tti's if they were the same price. To me,then,saving a couple hundred bucks makes it a no-brainer.
(I had a friend with a warmed over 440 (still 906 heads) in a 70 duster, with a good stall speed converter, and a 4.10 Dana. It had custom semi-fenderwell headers, in 2 1/4", with a four inch collector and primary pipe, necked down at the rear axle for a 3"turbo muffler. It was a beast! The headers are still hanging in my garage. Honestly, they ARE probably too big for a440. Now, a nasty
512? Hmmm.)