Offshoreonly.com - Exhaust Manifold Mounting

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LTZCrew

04-01-2019 11:49 AM

Exhaust Manifold Mounting

I did do a search and could not find anything - maybe i didn't look hard enough.

i have a 575sci with AFR heads and found the stock bolts are a bit of a PIA to use. i know on cars with heavier manifolds(trubos and stuff) builder likes t o use studs to help with sealing and the weight.
has any one used studs on marine manifolds - cmi style headers?
was thinking it would make installing them easier and help with gasket sealing

Help a noob out?

Crude Intentions

04-01-2019 11:56 AM

In a single don’t think it would be an issues. Studs aren’t used in a twin as you’d never get the manifolds off between engines. There may be other reasons also

Griff

04-02-2019 01:28 AM

All the info you need here https://www.offshoreonly.com/forums/...t-525efis.html

LTZCrew

04-02-2019 09:03 AM

Quote:

Originally Posted by Griff (Post 4679958)

All the info you need here https://www.offshoreonly.com/forums/...t-525efis.html

thank you!

NHGuy

04-03-2019 03:41 AM

To avoid the pain in arse of holding the manifolds in place while starting the bolts do this.
Get 2 longer bolts and grind off their heads to make mounting guides.
Slide on the gasket, then manifold. Once the manifolds are lined up put in 2 real bolts, remove the headless bolts, and install the remaining real ones.

flashgordon

04-03-2019 06:32 AM

i think it was mentioned already, but i use studs on just the end holes on each head.
the header gaskets are designed that way also
its enough to get headers on and started.
i have stelling headers, they are pretty heavy.

good luck ...

gw

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