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Did you get them to fit? Had to bevel the flange on my Doug's. I'm using the 452 heads also.

These are a bit cheaper. It's what I went with being on a budget. The fit was great, no hammer needed. Doug's Headers D452-B Doug's Headers | Summit Racing

The rear hangers at the mufflers will pretty much dictate the rear section and the header or down pipes will have the front.

Back at cha !

Doug's :thumbsup:

Another note when using Doug's headers on 452 heads is that these heads have a ridge that won't let the header flange sit flat. I don't know if other heads have this or not. Had to grind a bevel on the flange for it to fit flat.

You won't on a set of Doug's. Second bolt back requires having the header totally loose to get it started then you can get the rest of them.

The liquid Teflon works good. I've used Permatex #2 sealant also without any problems. Sealant on all of the studs or bolts. There is a high temp sealer, Permatex 27038 Optimum Red High Temperature Gasket Maker

I like to use a stud at each end of the head. Makes it easier to handle the header when installing. You can also slot the gasket at both ends then drop it into place when the header is hanging on the studs. Always use sealer on every stud and bolt. Some of the bolts on a Doug's header go under...

Most parts houses/stores carry them. AP is a common brand.

Al Jolson, Mammy! :lol:

Trade Ya! :D

Summit 6401 cam, Jegs $30 mufflers.

Maybe Jegs is showing more details? https://www.jegs.com/i/Dougs-Headers/776/D453/10002/-1

What number Doug's did you use?

Permatex #2

Don't know if anti-seize will seal the bolt good enough to stop coolant from seeping. I like Permatex #2 on the bolt threads. Nice job on the bolt removal. I was wondering if you had a welder. That's the way to do it:thumbsup:

You'll need the 451 headers for the 383. 1-3/4" primaries. The 452 is for the RB 413, 426, 440. They're a tad taller. I bought the Dougs with the black paint and they still look good. Nice fitment, no hammering dents for clearance. Quality product. When using them or any header on 452 heads...