Great subject and mis-understood by most lol.

You won't believe how many folks change pistons and don't get the crank re-balanced??? violin

I always cut as much off the lightest rod and then bring the others down to match!
Big-end weight is the one to get the most off, it counts for twice as much on the crank CB.

Most Sixpack rods will come down to stock LY weight with clever grinding, polishing etc.

Some sets are a 'LOST cause' due to mis-matching or careless parts swapping from different engines.

I once bought a 340 with 3 different style of rods in there... fan

Best combo I have found is lightened Sixpack rods with KB Hyper pistons in a 440.
Goes straight on the stock steel crank without much 'jiggery', with balancing.

If you have ever worked on 70 and 71 Sixpack engines you will know how tricky it can get... blah

As any sensible engine builder will tell you.

''50 year old rods are doomed to fail, so go new''.

I did an engine for a Moparmate and the 'press-fit' sixpack rod went soft and the pin migrated.
Wrecked the bore and cost a rebuild, on my expense...

Last edited by Gtxxjon; 10/26/21 12:02 PM.
Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...