Exhaust Manifold Bolts

[ike84]

Originally Posted by Dave80GTSi

-- STUDS !!! --

See my pictures and commentary in this thread, starting with post no. 11:

Tune after Headers only?

Dude, where did you find those headers?!

My metal guy and I actually schemed up a nearly identical design in case the china headers I have don't work out. Ford used a similar design on a bunch of headers in the 70s. Theoretically you don't actually need a collector with this style of header since there isn't really a merge point, as long as the lengths are calculated out correctly. Anyway, super cool setup. How have they worked out for you?

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[Dave80GTSi]

Originally Posted by ike84

Dude, where did you find those headers?!

You mean these?



These are simply early OEM non-cat factory manifolds which I bought used (and way cheap) and then had high temp coated.

I REALLY like this set-up. For a street car, I feel that they flow every bit as good as aftermarket headers which seem to have hit-or-miss fitment and quality. Since they are OEM parts, quality and fit are perfect.

Compare these to their cat brothers and ask yourself which one should perform better:



By the way - I went to my local hardware store and bought a dozen M8 full thread bolts, and then cut off their bolt heads at home with a Dremel cut-off wheel in order to create studs. Cheap to do, supporting a local business, and perfectly acceptable for the need.

[ike84]

Originally Posted by Dave80GTSi

You mean these?



These are simply early OEM non-cat factory manifolds which I bought used (and way cheap) and then had high temp coated.

I REALLY like this set-up. For a street car, I feel that they flow every bit as good as aftermarket headers which seem to have hit-or-miss fitment and quality. Since they are OEM parts, quality and fit are perfect.

Compare these to their cat brothers and ask yourself which one should perform better:



By the way - I went to my local hardware store and bought a dozen M8 full thread bolts, and then cut off their bolt heads at home with a Dremel cut-off wheel in order to create studs. Cheap to do, supporting a local business, and perfectly acceptable for the need.

Very nice. Where did you find the heads? Ebay?

How did you torque the bolts? Double nut? Or did you cut off the head of the bolt after you torqued then to the block?

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[Dave80GTSi]

Originally Posted by ike84

Very nice. Where did you find the headers? Ebay?

How did you torque the bolts? Double nut? Or did you cut off the head of the bolt after you torqued then to the block?

a) Yup, eBay.
b) Double nut, worked great!

[Gilles]

+ 1 on the studs.. combined with brass nuts, I used them on the Fiat and Alfa engines and are great.

https://www.vickauto.com/ALFA-ROMEO-PARTS/Alfa-Romeo-Spider-Parts/Exhaust/Brass-Exhaust-Nut-SKU-27-0840