305/350 crank

[Steve Williams]

Originally Posted by BillK

Steve,
Not sure what you mean by this ???? They are both the same exact castings. The 305 cranks have more metal machined out of the counterweights but other than that they start out as the same piece.

I tend not to take chances on balance. The first time I would put a 350 crank in a 305, I guarantee you the thing would vibrate ... Why even take the chance anyway ?? Balance it and be done with it.

There are also too many variations in stock piston weights to take a chance. Some of the late model 350 pistons are really light compared to the early ones. If I don't know where a crank came from, I will recommend balancing it, period.

Just my opinion,

Bill, I will try to upload a couple of pictures I have of the same casting number crank, one a 305 and the other a 350. The differences are more than you think. This also pointed out to me from my crank guy.

[carl hinkson]

Originally Posted by billk

steve,
not sure what you mean by this ???? They are both the same exact castings. The 305 cranks have more metal machined out of the counterweights but other than that they start out as the same piece.

I tend not to take chances on balance. The first time i would put a 350 crank in a 305, i guarantee you the thing would vibrate ... why even take the chance anyway ?? Balance it and be done with it.

There are also too many variations in stock piston weights to take a chance. Some of the late model 350 pistons are really light compared to the early ones. If i don't know where a crank came from, i will recommend balancing it, period.

Just my opinion,

x10000000

[BillK]

Steve,
I just remembered I have a "known" 305 crank out of a Mercruiser 305 I am doing for customer. I will have to take a look at it in the AM. I probably have 5 350 cranks to compare it to. Please try to post your pics also, I am always game to learn

Happy New Year,