I ordered a set of Dynomax ceramic coated headers for my '70 BB. Has anyone had any experience installing them. I am worried about clearance between the block and the steering box. smile.gif

i've heard good things. i haven't had hands-on experience with them, though.

ST70, Let me know how you made out i am thinking about getting a set my self. I have the same concerns what Dynomax part number are you using? Also what size are your primary tubes and collectors? WHAT GASKETS ARE YOU USING?
Gary GNUNZIO1@AOL.COM

I don't have the part number handy. I looked on the box, but found none. I got them from Jegs. Primaries are 1 3/4 and 3 inch collector. It will be some time before I try them on though, because the car is at the body shop. I also bought a flowmaster exhaust system to install along with the headers.

I am using the 1.75/3.0" dynomax coated headers. The passenger side dropped in, the drivers side took a little coaxing and had to ding the outside tube that runs right next to the brake distribution block on the frame,easier to install with oil filter removed. After that,you have room to change oil filter,and last time at the track I had to change starters between time runs and it was a piece of cake. I've had them for two years, headers still look great,and I need to change gaskets, I used the gaskets that came with the headers and just developed a crack in the drivers side about a month ago. You'll love them.

Get the Summit haeders and the Summit turbo mufflers and save yourself some cash for other things. I have heard that the Summit headers are the Dynomax (Blackjack) headers and the Summit turbos are praised on this site on a regular basis. Can't beat $14 for a proven turbo muffler.
I have not installed my Summit headers on my 454 yet but hear from others that they fit mint at $70. graemlins/thumbsup.gif

Dynomax ceramic coated full length headers for our beloved BBC Chevelles will be a great choice. I've used them on my ZZ502 equipped '72 Chevelle SS and have no complaints. If you are using a late model BBC engine (with newer style head bolts) some minor grinding of the flange is required to clear the bolt heads. Doesn't affect sealing, and is a common mod. Plenty of pix on both my sites below.

I've got the Dynomax 1-3/4 x 3 ceramic coated on my '72 w/ BBC, P/S, A/C, P/B, A/T. Used both column shift & floor shifters with them. No clearance issues of any kind, no dinging, finish still looks good. The car is a convertible w/ air (read: heavy), and still runs mid-12's at the track on slicks w/full exhaust and a pump-gas/hyd. flat tappet 454. I'd buy these headers again in a second.

I'm well pleased with the Dynomax coated headers on my big block. I did have to ding on the drivers side by the brake proportioning valve. I have seen absolutely no pitting or rusting even in the area I dinged. Much more than I can say for H....rs!!!

Not much more that I can add to what has been said so far. I am pleased. Installing into a BB car was not too difficult (important to raise the car as high as possible).

I see that the ceramic coating costs $161.

Summit headers for 454 (painted) $68

Dynomax headers for 454 (ceramic coated) $229

What is the purpose/function of the ceramic coating ? :confused:

Originally posted by Texas70:
What is the purpose/function of the ceramic coating ? :confused: Rust prevention, wont peel with heat (thats the idea anyway), cosmetics, and keeping the headers / underhood temps cooler.

Thanks for all your comments, I know now that I made the right choice in purchasing them at $260 a set it's not a bad deal. Also, thanks for the info. on the summit exhaust, but I think I am going to stick with Flowmaster.

On a different note: The engine in the car is a 396 with a stock cam. I am going to change to a better performance one. I talked and ordered one from summit, it's a Crane Powermax, H-266-2, 266/274 advertised duration. I am interested in performance, but more in the performance sound. This car will never see the track, but want to put the biggest baddest sounding cam I can without machining. Can anyone recommend one. I talked to a guy that races and he recommended a Comps cam. He said that crane is older technology, but I can't remember which cam he told me about. What do you guys/gals think?

You might look at the Comp 282H Magnum cam . I'm sure you will get several opinions here graemlins/thumbsup.gif

I run the Comp Cams Magnum 305H 575" lift. You need around 10.5:1 compression to use it. The idle is described as "radical". It sounds great. Low vacuum though. I just remembered the valve spring seats on the heads need machined out bigger diameter springs.

i have them on my sb they only cost me 119 at summit. driver side was easy pass was so hard i had to lift the engine. it is really hard to change my starter. did it once glad im not doin it again. oil isnt that hard but is not real easy.good luck

I have put 2 sets on my cars..One a SB one a BB.Both are ceramic coated...Both fit real well and were fairly easy to install...I haven't been real impressed with the coatings. I've had to recoat each set. :mad: Course, Jet Hot did it free. smile.gif

graemlins/waving.gif
Rick

One more thing, my car is a 4 speed. Does anyone else have any experience with other big cams that don't require machining?