Merc's were marked 1150's... Mariners were marked 115's. I've had both a 90hp and a 115 hp and both engines purred. (I still have the 115) They have a dinstinctive sound, and as I've said before they have awesome torque at the prop.
And for those that don't know, they have no separate head. The head is part of the block. It's all one piece. If you have to service the pistons or rods it's thru the bottom. Wierd, but very efficient and weight saving.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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