toddalin

Once you get a stud in there, what nut would you use? Header bolts have really small heads for the thread size.

redvetracr

I wouldn`t use a stud personally but if I did I might try a 12 point nut

TMU

I went through this recently and got some 3/8 x 16 x 1-1/4 grade 8 bolts from the auto parts store. They were about 1/4 inch longer than my original header bolts, but it was enough.

tsw71

I've been using studs with 12pt nuts for years now, but only on the front and rear holes. It's also nice to have the to studs hold the gaskets in place while installing. For all other holes, I use ARP 400-1209, which are 3/8-16 x 1" 12pt with a 5/16 wrench size. I can easily get a wrench on every bolt.

toddalin

I use an Allen key on mine. The head is small and you can get/make the length you need.

Shark Racer

I have 2 studs on the passenger side, one for the AC (typical of R4 compressor equipped C3s) and another at the bolt hole just rear of the #6 primary, used to hold my dipstick in place (Dart SHP 400 block uses 80-85 dipstick placement and slightly different tube).

I have to use 6-point bolts on the bolt holes on the inside of each outer primary (rear of 1,2; forward of 7,8) as the Hedman 68301s slightly crowd the bolt hole. I'm hoping to go to a different set of headers with a bit more engineering added into them, but I have another project taking precedence for the time being...

Also, I use header gaskets, probably because I am not a professional engine builder.

leadfoot4

You use gaskets???


OMG!!!

Les

OK, it's time to confess- I use gaskets too.

leadfoot4

Les

Thanks for understanding. Hell, I may as well come clean all the way- I use gaskets on my Holley double pumper too.

leadfoot4

Talk about overkill!!!

Shark Racer

Real engine builders don't use head gaskets. That lets you get away with not having to deck the block in most cases for proper quench.

Duane4238

Mr. Gasket has a new exhaust manifold gasket that's made of layered aluminum. It eliminates leaks caused by warped or damaged surfaces and also won't shrink. They say loose bolts from vibration and heat cycling are a thing of the past. After you get your bolt figured out, sounds like these would be the thing for you. Just read the ad in my Oct. '15 Hot Rod magazine. Good luck.
Duane

Les

Finally, somebody who "gets it"! You are now qualified to build engines. It's obvious you have the following highly coveted certifications, possessed by possibly only one other forum member- ASE, FOS, and JPC. Congrats!










ASE- Automotive Service Excellence
FOS- Full Of Sh**
JPC- Just Plain Crazy

leadfoot4

That's what GE invented RTV for!!!

toobroketoretire

Quench was long assumed to be very beneficial until the Hemi came along in the early 1950's and proved quench was not needed at all.

SH-60B

You are truly clueless. The quench area of the combustion chamber squishes the mixture into motion for more complete burn.

toddalin

Sure, and that is why Chrysler added quench to the modern generation of hemis.

The hemis were famous for their ability to breathe. But the big hump on the piston, necessary to fill this void space, screws with the combustion process by messing with the flame propagation.

http://www.hotrod.com/how-to/engine/...n-power-maker/

REELAV8R

Wow.