I have a 1989 5.7 TPI

Is it internaly balanced or externaly?

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Blue 1989 IROC Z28

 

You need an internal balance torsional damper. However, your 350 is technically not internally balanced thus the weight on the flexplate. I know it sounds confusing, just remember to go internal balance with the damper (if that's why you're asking). Hope this helps.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

Thats exactly why i'm asking. So if its externaly balanced why go with a dampener for internaly balanced????? i'm confused!

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Blue 1989 IROC Z28

 

all SBC except the 400 are internally balanced. when GM went to the one piece crank seal they had to remove the flywheel flange, thought it wasn't a weight it did add mass to the crank, so that had to replace this mass with the butterfly weight on the flex plate/flywheel to maintain the correct balance.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

Thanx guys !

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Blue 1989 IROC Z28