Dynomax Cerama-Coat Headers??
Thread Starter
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
Dynomax Cerama-Coat Headers??
Just wondering if these headers are ok for my 78.
I am considering headers and new exhaust for the baby but would appreciate some insight about these headers or any that are better.
# 289-86008 Cerama-Coat Headers,Corvette 1963-82, 283-400ci
They are advertised on Jeg's, they have to be good....
I am considering headers and new exhaust for the baby but would appreciate some insight about these headers or any that are better.
# 289-86008 Cerama-Coat Headers,Corvette 1963-82, 283-400ci
They are advertised on Jeg's, they have to be good....
Team Owner
Joined: May 2001
Posts: 29,745
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
CI 6-7-8 Veteran
CI-VIII Burnout Champ
St. Jude Donor '06-'10, '13
I am using the Headman coated headers. They fit very nicely. I don't have too much of a problem with ground clearance, my front spoiler is still lower. There is plenty of room around the steering box and the starter. Fit around the idler arm is tight, but it does fit.
I have run these in 115+ degree heat in Phoenix and have not had a problem with my stock starter turning over my 10:1 compression motor, so I don't think there is a "heat soak" problem at all.
I have run these in 115+ degree heat in Phoenix and have not had a problem with my stock starter turning over my 10:1 compression motor, so I don't think there is a "heat soak" problem at all.
Tech Contributor
Joined: Aug 1999
Posts: 14,376
Likes: 6,375
From: At my Bar drinking and wrenching in Lafayette Colorado
Originally Posted by fl_rider
Just wondering if these headers are ok for my 78.
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Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
No problems at all in fitting them to my '81. I haven't got the aircon system fitted so don't know about any issues fitting the compressor. I also changed the dipstick (p.side) to a chrome job at the same time so don't know if the stock one causes any ****les when fitting.
2 recommendations:
1. Use copper gaskets. I bought some stainless allen head screws & spring washers to use as the Header bolts. With the copper head gaskets I've had no problems in 2 years, just make sure you snug up the bolts after it's been run up a couple of times. The supplied collector gaskets are still in place & not leaking, so they're OK. Just be careful not to clamp them up too tight as they look like they might split if you do.
2. If you've got the stock starter then it'd be good insurance to fit a heat shild of some sort. Mine got fried shortly after fitting the Headers. It may have been on the way out anyway, but it worked fine prior to fitting the Headers so it's likely that it was cooked by them.
Don't forget to check the mixture after fitting them.
Apart from that, the Headers are ace
2 recommendations:
1. Use copper gaskets. I bought some stainless allen head screws & spring washers to use as the Header bolts. With the copper head gaskets I've had no problems in 2 years, just make sure you snug up the bolts after it's been run up a couple of times. The supplied collector gaskets are still in place & not leaking, so they're OK. Just be careful not to clamp them up too tight as they look like they might split if you do.
2. If you've got the stock starter then it'd be good insurance to fit a heat shild of some sort. Mine got fried shortly after fitting the Headers. It may have been on the way out anyway, but it worked fine prior to fitting the Headers so it's likely that it was cooked by them.
Don't forget to check the mixture after fitting them.
Apart from that, the Headers are ace
Safety Car
Joined: Aug 2000
Posts: 3,943
Likes: 44
From: Florham Park NJ Port Credit Ontario
I've got them on my 74. My only recommendation would be to throw the gaskets supplied with the headers straight in the garbage. Go buy a set of quality ones...you'll be glad you did.
Thread Starter
Drifting
Joined: Mar 2005
Posts: 1,806
Likes: 3
From: Burlington WI
Thanks again!!
I really appreciate the value of your experience.
Z-man I would imagine that they are 1-5/8" primary tubes like most other small block headers. I looked at Jeg's site and they didn't specify a tube diameter.
Thanks again guys.
Chris B
Z-man I would imagine that they are 1-5/8" primary tubes like most other small block headers. I looked at Jeg's site and they didn't specify a tube diameter.
Thanks again guys.
Chris B
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
The ones on mine have 1 5/8" primaries & 3" collectors. Reducers take it down to 2 1/2" for the pipes.
They made no difference in normal street running (that I could tell) but higher up the rev range the car no longer feels strangled. Additionally, I'm convinced that the engine bat is a lot cooler that it used to be & interiror heat isn't a problem. I rate them
They made no difference in normal street running (that I could tell) but higher up the rev range the car no longer feels strangled. Additionally, I'm convinced that the engine bat is a lot cooler that it used to be & interiror heat isn't a problem. I rate them
