Jarrett's 27 roadster
- Thread starter cooter
- Start date
young gun
Member
If u put a longer stroke in it with a small piston, wont it make a bigger engine??
fletcherson
Well-Known Member
Yep, back when everyone overheated 305’s and threw them out, I scavenged the cranks out of them. They can be made to be quite lethal. They used to race them on the round tracks a few years back.
The cranks have the same stroke, but do not directly interchange. The weights and balance are nowhere near the same. They need to be rebalanced and will take some work to get all to work.
fletcherson
Well-Known Member
Right, the 305 has lighter Pistons and rods, so a balance is required. Actually anytime a piston and or rod change is done it’s wise to have the rotating assembly balanced. Vibration is not our friend. I bought a flywheel at a swap meet that was supposed to be for a 400 sbc... I took a chance, but being suspicious, I bolted it on and started the car before installing the transmission. I’m glad because it liked to shake the car off of the rack, lol... off to see Bob at performance research, he fixed me up! It was 90 grams off.
cooter
Well-Known Member
I believe I read that 1 grm or maybe 1oz heavy spot on outside of a flywheel at 6,000 rpm was = to 300lbs. I believe gene berg said that.
Intrepid
Active Member
Yes .. you do have to watch out for balance.
Some engines are balanced internally like most small block Chevy's. (on the crank) but some are balanced externally on the flywheel.
283's and 327's have steel cranks and are very well balanced from factory thus highly sought after, and the rotating assembly is balanced, this is why when you take one apart you label everything and put it all back exactly in the same location.
Some engines are balanced internally like most small block Chevy's. (on the crank) but some are balanced externally on the flywheel.
283's and 327's have steel cranks and are very well balanced from factory thus highly sought after, and the rotating assembly is balanced, this is why when you take one apart you label everything and put it all back exactly in the same location.
