Originally Posted by z2811secpass
I AM BUILDING A 377 FROM A STD BORE 350 3.75 STROKE AND A 6 INCH ROD. I HAVE A STEEL CRANK ,SIR I BEAMS ,AND FLAT TOP , ZERO DECK HEIGHT ,WITH 215 IRON EAGLES,
ANYWAY I AM WANTING INTERNAL BALANCING,
SINCE A 4 INCH BORE PISTON IS LIGHTER THAN A 4.125 PISTON BUT A 6 INCH ROD IS HEAVIER THAN A 5.565 STOCK ROD (POSSIBLY).
. IF I TAKE MY ASSEMBLY TO MY MACHINE SHOP WITH A 350 BALANCER AND FLEX, SHOULD THEY BE ABLE TO INTERNAL BALANCE IT WITHOUT MAJOR MALLORY EXSPENSE.
MY CRANK WAS A STELL CRANK FROM A SPEED-O-MOTIVE ENGINE AND WAS BALANCED EXTERNALLY TO A 5.7 ROD 406 ORIGINALLY.
DO YOU GUYS THINK MY CRANK COUNTER WEIGHT ARE POSSIBLY HEAVY ENOUGH TO MAKE THE BORE SIZE DROP BUT PISTON INCREASE?
ALSO IF ANY OF YOU GUYS HAVE A GREAT RUNNING 383 I WOULD LOVE TO HEAR THE POWER THEY MAKE AND TIMES THEY RUN ON MOTOR ONLY
IF ITS NOT TO MUCH TO ASK WHAT TYPE OF POWER CAN BE EXPECTED FROM THIS COMBO WITH A 268 278 @.050 AND 567 587 LIFT SOLID ON A 106, VICTOR JR INTAKE 4500 CONVERTOR ,4.10 GEAR AND IN A 3000LB S10..
THANKS FOR THE ADVISE
First of all it will not internal balance without lot's of problems, no matter what rod's and pistons you have, so just find an external balance flexplate and balancer, then have the assy. balanced with them.
With the iron Eagle heads it pretty easy to make 450HP, but not a lot more without some work.
I would say you are building a nice street motor, but don't donot expect better than 12's in the QTR. mile if you can hook it up.
JMO
Zip.