6M crank or 7M crank?
- Thread starter David D
- Start date
6m is lighter and the 7m is better balanced.
so you can either balance the 6m which will lighten it a tad more or lighten and re balance the 7m.
so you can either balance the 6m which will lighten it a tad more or lighten and re balance the 7m.
7m is fully counterweighted so its smoother.. but weighs more.. so taking the 7m and having it shaved and rebalanced is the best .. but cost a ton..
so imho eather or stock will work fine.. if you want little more rpm go with the 6m if you want a smoother engine thats easyer on the bottom end go with 7m
so imho eather or stock will work fine.. if you want little more rpm go with the 6m if you want a smoother engine thats easyer on the bottom end go with 7m
CajunKenny;1380748 said:
How do you strech the cheezy (sorry, I meant 'chevy') crank to fit?
It is too short for a 7M block.
If you have personally done that, I for one would love to see pictures.
Now on the 7M vs. 6M,
I just seen a post by IJ a few weeks ago on the subject,
sounds like he has the most experience on this.
So... I tore open my 7mgte and the crank is marked 6m. I just figured they brought the crank over from the 6m to save some money...
hvyman;1381000 said:
7M crank is fully counterweighted.....they're ALL balanced, look at a 6M you'll see missing counterweights on a couple of the throws, to compensate others are larger/longer so it's never going to be as smooth running as a 7M crank.
i have a 7m crank motor and a 6m crank motor. the 7m crank motor is what i'm driving now. really the difference in how they drive is hard to even notice...
I had the 2 top cranks in the same engine within 2 weeks with the cranks being the only change and it's noticable.
