dynomax header fit??
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
Likes: 0
From: las vegas nv
dynomax header fit??
hi guys. have just ordered some heads and a cam. bout ready to get some headers. read several posts about dynomax coated headers. question. how good is the fit?? pita factor?? how is spark plug access. have a gmpp mini starter already, so shouldnt heat soak. any tips on what to/not to do?? car is a 77 with a th350. thanks for any input. regards, fng
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Re: dynomax header fit?? (FNG)
The fit is pretty good. The only issue I have with them is both the Header collector and the Reducer have a movable triangle pieces. I was expecting one of them to be a fixed piece and one movable. I think that has caused some of my sealing issues.
Racer
Joined: Dec 2002
Posts: 400
Likes: 0
From: Spartanburg SC
Re: dynomax header fit?? (Sigforty)
Fit is good and easy, as long as you get the car high enough to get underneath easily. They tell you to go from the bottom, so do that, don't try from the top, it make look easy to go from the top, but its much easier from the bottom. ( I know from experience!!!)
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
Likes: 0
From: las vegas nv
Re: dynomax header fit?? (78pace)
thanks guys. looks like the plastic is coming out again :D
sig forty.......what kind of sealing problems did you have??
thanks again, regards, fng
sig forty.......what kind of sealing problems did you have??
thanks again, regards, fng
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: dynomax header fit?? (FNG)
The coller on the reducer is too thin IMO, it bent when tightened. I used 2 gaskets and got them to seal pretty well. I tried earl's insert types but they did not work nearly as well as they did for the head exhaust gaskets.
Team Owner
Joined: Dec 1999
Posts: 26,555
Likes: 257
From: Florida
2021 C2 of the Year Finalist - Modified
C2 of the Year Finalist - Modified 2020
C2 of Year Finalist (performance mods) 2019
St. Jude Donor '03 thru '26
Re: dynomax header fit?? (Fevre)
Use Stage 8 Fastners. :)
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Re: dynomax header fit?? (FNG)
I used Percy's aluminum gaskets all through out the install. I had trouble with the metal bending line fevre said. I tightented the collector to reducer, but all that is happening is the metal is bending it is not sealing that well. I may try to gaskets to see what happens.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: dynomax header fit?? (Bobchad)
Whad did you end up using for head to header gasket? Based on what I have read, I am planning on going with Mr. Gasket Ultra-Seal Exhaust Gaskets.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: dynomax header fit?? (Bobchad)
It is an Earl's, they have replacable inserts if they get totally trashed for about $25. One thing though you have to be careful putting the insert in or it can fold at the thin spots. I bought replacement inserts when I changed eng and was going to switch them all out but folded one when putting it in so I reused an old one, sealed right up. I bought them from Summit, link below to page:
http://store.summitracing.com/search...arl%27s+header
First ones I bought with the alum retainers came uncut so I had to cut the inserts to fit my exh ports, a little pain in the ars for a mild build up but if you where racing it would be good to match the gasket to the port. Second set I went with the pre-cut 1.5 x 1.5 to save some time. There are a few diff port sizes to choose from.
http://store.summitracing.com/search...arl%27s+header
First ones I bought with the alum retainers came uncut so I had to cut the inserts to fit my exh ports, a little pain in the ars for a mild build up but if you where racing it would be good to match the gasket to the port. Second set I went with the pre-cut 1.5 x 1.5 to save some time. There are a few diff port sizes to choose from.
Melting Slicks
Joined: Jul 1999
Posts: 3,030
Likes: 17
From: White Pine / Dandridge TN
Re: dynomax header fit?? (Bobchad)
I wish I could say my experience with these headers has been as good as everyone else. The install was not a problem. My issue is with sealing. I have never been able to get them to seal well. I have used dead soft copper gaskets to no avail. I have stage 8 locking fasteners also. To boot, the bottom section on the driver's side is starting to show rust thru the ceramic coating. Next time, I'm going with a higher quality header with a thicker flange. I had to cut the passenger side flange with a hacksaw to relieve the warped flange.
Thread Starter
Instructor
Joined: Mar 2002
Posts: 247
Likes: 0
From: las vegas nv
Re: dynomax header fit?? (Frankenvette)
well , thanks again fellas. maybe i should go with hookers?? dont want any problems and really only want to do this once. may pony up for some better ones. any input here??
6t9.already have duals with flowmasters, no cats. no smog ***** where i have it registered.
thanks again guys, regards, fng
6t9.already have duals with flowmasters, no cats. no smog ***** where i have it registered.
thanks again guys, regards, fng
