Long Tube Header Bolts

[340inabbody]

I just fired up my 340 after 4 years of being offline and it went better than I anticipated. At this point I have to replace my aluminum radiator as it’s leaking. So I didn’t keep it running long. I did however notice a lot of smoke and I am guessing I have some header leaks as well as a lot of stuff burning off.

I am currently using 5/16 x 3/4 Alen Heads with Nord-Lock washers. I think 1” would have better engagement. My flange and gasket stack up is 1/4”.

What size bolt and head type do you guys use? Dealing with cyl 3,5&7 is tight.

 

[Syleng1]

3/8 head hex header bolts and 1-1/4” length. (I believe)
I’m running Doug’s headers on both my small blocks. Remflex gaskets.

 

[mygasser]

if you find the longer bolts won't go 'straight' due to how close the bend in the tube is then fit those first on just a couple of threads. that way you can keep the header flange away from the head face 'til the awkward ones are all started.
neil.

 

[JDMopar]

If you use studs in the end bolt holes, instead of bolts....you won't have to drain the radiator every time you have to replace header gaskets.

 

[MidnightSwinger]

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