69 302 Header Recommendation? - Team Camaro Tech
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post #1 of 15 (permalink) Old Jan 13th, 13, 09:21 PM Thread Starter
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69 302 Header Recommendation?

Looking for a good set of headers for my 69 Z28 - have the stock manifolds/heads on it now but would like to get more torque. I've lowered the front end 2", so I'm worried about clearance with long-tubes. So - for more torque and decent ground clearance, what should I run?
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post #2 of 15 (permalink) Old Jan 14th, 13, 09:50 PM
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Re: 69 302 Header Recommendation?

Thorley Tri-Ys.

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post #3 of 15 (permalink) Old Jan 15th, 13, 09:24 AM Thread Starter
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Anyone like/dislike Doug's or Hedman?
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post #4 of 15 (permalink) Old Jan 15th, 13, 09:46 AM
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Re: 69 302 Header Recommendation?

Headers generally add 'high rpm horsepower', not low rpm torque. if you do install headers, and 'torque' is an issue for you, then you should keep the primary tubes on the small side (1-5/8" and no larger than 1-3/4" dia). PS> torque is generally not a strong point with the 302 (or any big bore, short stroke engine). long stroke engines (under square) generally delivers higher torque and lower high rpm power; Oversquare engines like the 302 deliver high rpm horsepower at the expense of low rpm torque. The Tri-Y design is as good as you will get for 'torque'...

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post #5 of 15 (permalink) Old Jan 15th, 13, 12:13 PM
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Re: 69 302 Header Recommendation?

Unless you are talking about an over-square 406.......

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Last edited by Gary L; Jan 15th, 13 at 12:33 PM.
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post #6 of 15 (permalink) Old Jan 15th, 13, 07:40 PM
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Re: 69 302 Header Recommendation?

Thorley 376Y1 are 1+5/8" primary tri-y and fit great. Good clearance to PS box, collectors tuck up really tight and should help your midrange a bit. They ain't cheap though...

Doug's D368 is another popular choice that seems to fit well, but the 1+3/4" primaries aren't likely to help your midrange torque much.

Doug's D308 is a 1+5/8" full length, but I don't remember hearing much about these as to how they fit, etc.

I'm running the 376Y1's on my 69 with the "other" 5.0L (307) and I'm happy with them.
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post #7 of 15 (permalink) Old Jan 15th, 13, 08:24 PM
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Re: 69 302 Header Recommendation?

With the help of another TC member I modified my back drive linkage to work with my Thorley's.

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post #8 of 15 (permalink) Old Jan 15th, 13, 10:41 PM
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Re: 69 302 Header Recommendation?

Quote:
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Unless you are talking about an over-square 406.......
*G*.. That's too much mass and too many cubes... *G*.. a 'big' 368 or so is about as large as I'd go to keep the 'high winding' nature....

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post #9 of 15 (permalink) Old Jan 16th, 13, 08:44 PM
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Re: 69 302 Header Recommendation?

I wasn't talking about a hi-winder.

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post #10 of 15 (permalink) Old Jan 16th, 13, 09:02 PM
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Re: 69 302 Header Recommendation?

Yep.. 406 is a stroker.. perfect for a truck.. for hauling..

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post #11 of 15 (permalink) Old Jan 16th, 13, 09:09 PM
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Re: 69 302 Header Recommendation?

I have hooker 1 5/8 tubes on mine. They tuck up pretty nice, have never bottomed them out. Did you change your heads as well?
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post #12 of 15 (permalink) Old Jan 17th, 13, 06:51 AM
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Re: 69 302 Header Recommendation?

Quote:
Originally Posted by 69Z28-RS View Post
Yep.. 406 is a stroker.. perfect for a truck.. for hauling..
No, a 406 is a bored, stock SB 400 from Chevrolet.

How did you select 368 CI? Explain that to the 377 CI crowd.

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post #13 of 15 (permalink) Old Jan 20th, 13, 02:04 PM
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Re: 69 302 Header Recommendation?

Here's a set of Doug's, 1 5/8, nice fit and finish, plug access and clearance is good, very happy with them.
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post #14 of 15 (permalink) Old Jan 21st, 13, 10:32 AM
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Re: 69 302 Header Recommendation?

I am interested in the tri-y's also and have been searching quite a bit here but haven't found anything on spark plug clearance until Zman here. For a 350, are all plugs clearing the tubes...no need for short plug or heat shield on wire?

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post #15 of 15 (permalink) Old Jan 22nd, 13, 10:10 PM
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Re: 69 302 Header Recommendation?

FYI, I used Accel shorties to get proper clearance.
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