Mercruiser 7.4 center rise exhaust spacing

[holorinhal]

Any one know or know where to find, how far appart centerline of the exhaust risers are, fron centerline of the crankshaft, on a 7.4(BBC) Merc are?
I have searched forever and cant find the info. I have once had a diagram with dimentions, bu can not find it.
I am installing thru hull exhaust, on a sbc, but want to drill the holes for a future bbc install.

 

[Bondo]

Re: Mercruiser 7.4 center rise exhaust spacing

Ayuh,.... If ya drill for the SBC, you'll have enough wiggle room when the time comes to fit the BBC,...

The width difference is tiny,...

 

[Fun Times]

Re: Mercruiser 7.4 center rise exhaust spacing

This link should help give you what your looking for. All you'll need to do is find your engine model.

Installation Drawings | Mercury Marine

Hope this helps, Good luck.