I am looking at these risers for my SBC and the guy doesnt know if these are for SBC or BBC... and of course I have no clue either. I know they are from IMCO but thats it. Looks like they fit the stock mercrusier sbc manifolds...

Measure the bolt hole pattern and inside dimension

those replace stock mercruiser cast elbows .they also look to be 3'' taller

They look like BCC riser.

The IMCO SBC risers do not have the collar or bump (enlargement in the middle)

I have had both and Id say these are BBC units.


Uncle Dave

Just got off the phone with Rick from IMCO and he said they are stock replacement risers for either BBC or SBC, but have to be center rise manifolds... so i guess im good with these. Just need to make sure that the height is ok with them. He wasn't sure if they were the 3 inch added or not, but it should matter too much on my setup.

Thanks for the suggestions, you guys are great!

http://www.offshoreonly.com/forums/g...rs-needed.html

I still have the ones pictured in the thread above in my garage. Wrapped up and look identical to the pictures I posted awhile back. If they work for your application make me an offer! They make lousy paperwieghts.