Doug's D368 Headers - Team Camaro Tech
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post #1 of 12 (permalink) Old Aug 12th, 08, 09:52 PM Thread Starter
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Doug's D368 Headers

Do any of you guys have this header on your Camaro? If you do what is your engine mount/frame stand combination and how is the fitment? I have searched site and found a few things about this header but not much. I have a brand new set of hooker super comp 2130HKR headers for my 406, but I was wondering if the dougs headers would be better for my application? I bought the hookers because I found them at a swap meet for $150 bucks(430 bucks everywhere online) and I knew they would fit with angle plug heads. However, they are the smaller primary, 1 5/8". I am going to run angle plug AFR 195 eliminator heads on a 406.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #2 of 12 (permalink) Old Aug 13th, 08, 06:11 AM
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Smile Re: Doug's D368 Headers

I have D-368's on my '69. They fit fine. Because my motor has raised port exhaust ports I had to slot the flanges. This raises the headers about 1/4 inch in relationship to everything else but I have no fitment problems.

The idlers arm is close and the left upper c/arm bolt is close but everything clears. With the angle plug heads the plugs are easy to get to. Lots of room for the bell crank.

They do fit snug under the car. Ground clearance is great!

They do sound just a little bit tinny.

I'm happy. I did my research when I replaced my motor mounts.

All is good.

Dave

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post #3 of 12 (permalink) Old Aug 13th, 08, 06:55 AM
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Re: Doug's D368 Headers

I'd stick with the Hooker headers. A properly designed set of 1-5/8" headers will work just fine on your car.

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post #4 of 12 (permalink) Old Aug 13th, 08, 01:20 PM
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Re: Doug's D368 Headers

Quote:
Originally Posted by 67SS&99SS View Post
Do any of you guys have this header on your Camaro? If you do what is your engine mount/frame stand combination and how is the fitment? I have searched site and found a few things about this header but not much. I have a brand new set of hooker super comp 2130HKR headers for my 406, but I was wondering if the dougs headers would be better for my application? I bought the hookers because I found them at a swap meet for $150 bucks(430 bucks everywhere online) and I knew they would fit with angle plug heads. However, they are the smaller primary, 1 5/8". I am going to run angle plug AFR 195 eliminator heads on a 406.

how high are you going to twist it??

69 Camaro
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post #5 of 12 (permalink) Old Aug 13th, 08, 06:09 PM Thread Starter
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Re: Doug's D368 Headers

6500 probably, really it depends on what the dyno says. I carried my block to the machine shop last week, he's doing the machine work this week and the assembly probably next week. I'm going to have him dyno the motor when he is finished so I'll know where the peak #s are. I'm expecting this to be a 500-540 hp motor.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #6 of 12 (permalink) Old Aug 13th, 08, 06:11 PM Thread Starter
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Re: Doug's D368 Headers

Quote:
Originally Posted by Fred Mertz View Post
I have D-368's on my '69. They fit fine. Because my motor has raised port exhaust ports I had to slot the flanges. This raises the headers about 1/4 inch in relationship to everything else but I have no fitment problems.

The idlers arm is close and the left upper c/arm bolt is close but everything clears. With the angle plug heads the plugs are easy to get to. Lots of room for the bell crank.

They do fit snug under the car. Ground clearance is great!

They do sound just a little bit tinny.

I'm happy. I did my research when I replaced my motor mounts.

All is good.
Do you have any pictures of yours?

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #7 of 12 (permalink) Old Aug 14th, 08, 05:18 PM Thread Starter
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Re: Doug's D368 Headers

I guess I will get the dougs headers. The engine builder said that I would dyno a good bit higher with the 1 3/4" and they would better suit my build than the 1 5/8". He said that the 1 5/8" would be perfect for a similarly built 350.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #8 of 12 (permalink) Old Aug 14th, 08, 05:52 PM
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Re: Doug's D368 Headers

I have a set of TriY on my AFR 195 heads, not the new ones. They fit well , match ports but if I had the option, I would go for the 1¾ 4 into 1 tubes. I use the stock sbc towers that came with my car . I suspect the small tubes, 1 5/8", could be holding back some hi end hp but then again, I don't hi end the motor, every day or weekend. Mainly a long distance hi speed cruiser.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #9 of 12 (permalink) Old Aug 22nd, 08, 08:18 PM Thread Starter
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Re: Doug's D368 Headers

Got to see the headers for the first time today. Got them on wednesday but I just started back at college and couldn't come back home til today. Nice heavy gauge tubing and thick flanges. Should look and perform well on the new motor. Engine builder said I would have it back the week after labor day. Here are some pics of the headers










1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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post #10 of 12 (permalink) Old Aug 22nd, 08, 09:24 PM
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Re: Doug's D368 Headers

I have those headers and they fit great. I think you said angle plug heads?? You will need shorty plugs in #3 and 5 I think. To install the drivers side just get the car up high to put in in from the bottom, header almost needs to be 90 degrees to the bottom of the car but it will slip right in. Passenger goes in from top. Took me no more than 20 minutes last time.

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post #11 of 12 (permalink) Old Aug 22nd, 08, 09:51 PM
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Re: Doug's D368 Headers

Sorry, I just saw your reply. I don't have pictures as my camera only takes blurry pictures. I should get a cheaper one next time.

I layed my left side header in place and tied it up with bungy cords when I put my motor in. I only put 2 bolts in each side. And later installed the header gaskets. I put the right side in after I had the motor bolted down and the starter in. I have that much room!

Plug clearance is no problem with std. length plugs on all cylinders.

Dave

Dave

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__________
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post #12 of 12 (permalink) Old Aug 23rd, 08, 04:43 PM Thread Starter
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Re: Doug's D368 Headers

Quote:
Originally Posted by jackr View Post
I have those headers and they fit great. I think you said angle plug heads?? You will need shorty plugs in #3 and 5 I think. To install the drivers side just get the car up high to put in in from the bottom, header almost needs to be 90 degrees to the bottom of the car but it will slip right in. Passenger goes in from top. Took me no more than 20 minutes last time.
Yes I have angle plug heads. Thanks for the tips.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

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