If you're running a 400 sbc... - Team Camaro Tech
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post #1 of 13 (permalink) Old Mar 4th, 07, 07:54 AM Thread Starter
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Jim
 
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If you're running a 400 sbc...

In your first generation Camaro, what headers do you recommend for fit and performance? I will be replacing the ZZ4 crate motor with a worked 400 smallblock backed by a 400 trans. There are several header options. Which do you prefer and why?

Thanks.
Jim


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Then: N/A, 436 ci, Stock Block, Track 1's, Stock Suspension, Ranchos, 3250 lbs... 1.33 60 ft / 9.69 @ 138 mph
Now: Boost...
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post #2 of 13 (permalink) Old Mar 4th, 07, 08:00 AM
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Re: If you're running a 400 sbc...

I have an aluminum head 400 running thorley 376 Y1C headers. These are worth the extra money they cost. Heavy flanges, they tuck up under the car real nice and clear the P/S box by about an inch. And as a bonus they look good too!
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post #3 of 13 (permalink) Old Mar 4th, 07, 08:05 AM
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Re: If you're running a 400 sbc...

I have Hooker Comps 1 5/8" tubes.
Manual steering box and 350th tranny if that helps.

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #4 of 13 (permalink) Old Mar 4th, 07, 08:42 AM
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Re: If you're running a 400 sbc...

I have the older design Hedman 65003's which match my ProTopline exhaust port well. I like the Dougs/Thorleys but the port is too small in their tri-y design.

Rick Dorion
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
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post #5 of 13 (permalink) Old Mar 4th, 07, 09:10 AM
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Re: If you're running a 400 sbc...

I'm going with my old 1 3/4" hooker s/c

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post #6 of 13 (permalink) Old Mar 4th, 07, 10:33 AM Thread Starter
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Re: If you're running a 400 sbc...

Thanks for the feedback fellas. Keep it coming. It's a 540 hp 408 sbc. I'm leaning toward the 1-5/8".

Anyone have to make any cuts in the firewall or elsewhere?

Jim


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Then: N/A, 436 ci, Stock Block, Track 1's, Stock Suspension, Ranchos, 3250 lbs... 1.33 60 ft / 9.69 @ 138 mph
Now: Boost...
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post #7 of 13 (permalink) Old Mar 4th, 07, 12:28 PM
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Re: If you're running a 400 sbc...

Quote:
Originally Posted by .gearhead. View Post
Thanks for the feedback fellas. Keep it coming. It's a 540 hp 408 sbc. I'm leaning toward the 1-5/8". Anyone have to make any cuts in the firewall or elsewhere?Jim
a 1 5/8" header may reduce that 540 HP, just go 1 3/4" the price should be almost the same

cut the firewall for what reason?

68 Z/28, grotto blue, protect-o-plate
67 plain jane survivor, deep water blue, protect-o-plate
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post #8 of 13 (permalink) Old Mar 4th, 07, 01:20 PM
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Re: If you're running a 400 sbc...

I run 1 3/4 hooker super comps, it's an automatic w/ power steering and all fits well. I had to make the slightest clearance dimple by the pitman arm, but thats it.
I agree with 1 3/4 headers at that power level. Though 1 5/8 wouldn't be too far off you have no more room to grow.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

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post #9 of 13 (permalink) Old Mar 4th, 07, 01:27 PM Thread Starter
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Re: If you're running a 400 sbc...

Okay, I'll begin my hunt for a set of 1-3/4".

I heard that a spacer may be needed for the 1-3/4. I'm usually the type person that just buys one of each, but want to turn over a new leaf and go with what works best the first time.

Good info.

Jim


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Then: N/A, 436 ci, Stock Block, Track 1's, Stock Suspension, Ranchos, 3250 lbs... 1.33 60 ft / 9.69 @ 138 mph
Now: Boost...
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post #10 of 13 (permalink) Old Mar 4th, 07, 02:08 PM
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Re: If you're running a 400 sbc...

I didn't need any spacer. What heads do you have? Actually, make sure your exhaust port size matches the headers. I couldn't grind enough on 1 5/8" headers to make them match my ProTopline heads.

Rick Dorion
69 RS Conv therapy program, Autogear M22, 8-pt cage, with a new 410! SOLD
New therapy program - 68 Coupe. Will be survivor exterior, modern underpinnings! SOLD
67 Belair with perfect floors, pinchwelds and firewall. Hmmm!
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post #11 of 13 (permalink) Old Mar 4th, 07, 02:18 PM
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Re: If you're running a 400 sbc...

Quote:
Originally Posted by .gearhead. View Post
Thanks for the feedback fellas. Keep it coming. It's a 540 hp 408 sbc. I'm leaning toward the 1-5/8".

Anyone have to make any cuts in the firewall or elsewhere?

Jim
What is your recipe for making 540 HP?

Bryan
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post #12 of 13 (permalink) Old Mar 4th, 07, 04:26 PM
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Re: If you're running a 400 sbc...

I know the 1 5/8" may be hurting me now with new cam (est. 500+) but gonna run what I have for now (cam swap ended up $1700 maybe more )

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #13 of 13 (permalink) Old Mar 4th, 07, 06:27 PM Thread Starter
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Re: If you're running a 400 sbc...

Quote:
Originally Posted by RickD View Post
I didn't need any spacer. What heads do you have? Actually, make sure your exhaust port size matches the headers. I couldn't grind enough on 1 5/8" headers to make them match my ProTopline heads.
Running Crane Fireball heads on this one.


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Then: N/A, 436 ci, Stock Block, Track 1's, Stock Suspension, Ranchos, 3250 lbs... 1.33 60 ft / 9.69 @ 138 mph
Now: Boost...
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