can someone tell me what crankshaft is used in the stock merc 6.1l mag is it mercruiser crank or do they use another GM stock crankshaft ?

Ayuh,.... 6.1l,..??..??



heard of the 6.2l, 'n the 6.0l......

oups my mistake 6.2l

You would think they got the longblock from GM as they (GM) make the HT383 which is 340hp.

However, GM says they use a 3.80" stroke crank. Weird huh ? Supposedly they did this to get the piston closer to the block's deck height. Supposedly, too, this crank was made by Cola. Obviously, a forged steel crank.

Merc lists your motor as having the more typical 3.75" stroke crank used in most other 377/383's. Also listed as a forged steel crank.

So...since I have no valuable info...a good source here would be to contact BobL on this board, as I believe he has done a lot of stuff on the 6.2's, from upgrades, to performance rebuilds, to Whipple's, to heads, cams, and etc,etc,etc

Hope the 2nd part helps. LOL.