Opposite rotation vortec ?

Tronic72

Cadet
Joined
Feb 6, 2016
Messages
9
Hi,

I have two mercruiser 305s. One rotations in standard direction and one in opposite direction. I have two standard rotation 350s (vortec) from a 2001 boat that is like to rebuild to use to replace the 305s, however, the vortecs use a roller camshaft and I'm not sure if or how these roller camshafts can be made to rotate in opposite rotation. Has anyone had experience in opposite rotation engines?

Thanks.

Ps the 305s were non vortec engines without roller cams and I'm lead to believe it was easier for these to be built as opposite rotations engines
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
40,582
Howdy

What drives are on the boat, V, Straight, Alpha, Bravo?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,468
I have two mercruiser 305s. One rotations in standard direction and one in opposite direction.

Ayuh,.... Welcome Aboard,.... Are ya S u r e of that,..??

I believe the right-handed motors were obsolete, before the 305s were intro'ed,....

What drives in yer boat,..??

Merc went to counter-rotatin' drives long ago too,....
 
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