Flywheel options
Thread Starter
Junior Member

Joined: Apr 2014
Posts: 63
Likes: 1
From: White, Georgia
Car: 82 Pontiac Trans Am
Engine: 350 Vortec, sprayed
Transmission: T56
Axle/Gears: Spooled Strange 12 bolt, 3.73 gears
Flywheel options
Hey folks,
I have an LT t56 in my car. What externally balanced flywheel options do I have for a 1 piece rear main 350?
Thanks for any help
I have an LT t56 in my car. What externally balanced flywheel options do I have for a 1 piece rear main 350?
Thanks for any help
Thread Starter
Junior Member

Joined: Apr 2014
Posts: 63
Likes: 1
From: White, Georgia
Car: 82 Pontiac Trans Am
Engine: 350 Vortec, sprayed
Transmission: T56
Axle/Gears: Spooled Strange 12 bolt, 3.73 gears
Joined: Sep 2005
Posts: 27,861
Likes: 2,427
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Flywheel options
I believe the LT is externally balanced.
It is INTERNALLY balanced like ALL other SBCs other than the 400. Just, the last rearmost little bit of INTERNAL balance weight, which used to be located on the crankshaft flange in the 85-back engines, had to be relocated to the flywheel or flex plate in the 1-pc RMS engines, since the flange then had to be round. That DOES NOT make those engines "externally" balanced.
Here's what the old balance weight for 3.48" stroke cranks used to look like. The 86-up motors are balanced EXACTLY the same as this, INTERNALLY, just, that little bit of INTERNAL weight is located on the bolt-on piece instead of on the crank. That DOES NOT make them "externally" balanced any more than it being located outside the oil pan made 67-85 350, 305, 262.5, & 267 "externally" balanced.

All that aside, the 86-up 305 & 350 have the same INTERNAL balance as the 92-97 LT1, with the little bit of INTERNAL weight relocated to the flywheel. A stock LT1 flywheel, or aftermarket one for the same application, will work fine on your 1-pc RMS 350 since they share that same INTERNAL balance scheme.
Last edited by sofakingdom; May 11, 2025 at 06:29 PM.
Thread Starter
Junior Member

Joined: Apr 2014
Posts: 63
Likes: 1
From: White, Georgia
Car: 82 Pontiac Trans Am
Engine: 350 Vortec, sprayed
Transmission: T56
Axle/Gears: Spooled Strange 12 bolt, 3.73 gears
Re: Flywheel options
It is NOT. Like SO MANY things these days that seem to attract the same kind of mental midgetry, you CANNOT "believe" something into existence.
It is INTERNALLY balanced like ALL other SBCs other than the 400. Just, the last rearmost little bit of INTERNAL balance weight, which used to be located on the crankshaft flange in the 85-back engines, had to be relocated to the flywheel or flex plate in the 1-pc RMS engines, since the flange then had to be round. That DOES NOT make those engines "externally" balanced.
Here's what the old balance weight for 3.48" stroke cranks used to look like. The 86-up motors are balanced EXACTLY the same as this, INTERNALLY, just, that little bit of INTERNAL weight is located on the bolt-on piece instead of on the crank. That DOES NOT make them "externally" balanced any more than it being located outside the oil pan made 67-85 350, 305, 262.5, & 267 "externally" balanced.

All that aside, the 86-up 305 & 350 have the same INTERNAL balance as the 92-97 LT1, with the little bit of INTERNAL weight relocated to the flywheel. A stock LT1 flywheel, or aftermarket one for the same application, will work fine on your 1-pc RMS 350 since they share that same INTERNAL balance scheme.
It is INTERNALLY balanced like ALL other SBCs other than the 400. Just, the last rearmost little bit of INTERNAL balance weight, which used to be located on the crankshaft flange in the 85-back engines, had to be relocated to the flywheel or flex plate in the 1-pc RMS engines, since the flange then had to be round. That DOES NOT make those engines "externally" balanced.
Here's what the old balance weight for 3.48" stroke cranks used to look like. The 86-up motors are balanced EXACTLY the same as this, INTERNALLY, just, that little bit of INTERNAL weight is located on the bolt-on piece instead of on the crank. That DOES NOT make them "externally" balanced any more than it being located outside the oil pan made 67-85 350, 305, 262.5, & 267 "externally" balanced.

All that aside, the 86-up 305 & 350 have the same INTERNAL balance as the 92-97 LT1, with the little bit of INTERNAL weight relocated to the flywheel. A stock LT1 flywheel, or aftermarket one for the same application, will work fine on your 1-pc RMS 350 since they share that same INTERNAL balance scheme.
Joined: Sep 2005
Posts: 27,861
Likes: 2,427
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Flywheel options
I BELIEVED it
Sorry to hear that.
The Google isn't perfect. Most especially, It responds to whatever appears on The Interwebz the most, whether correct or not. Kind of a shame really butt that's the way the cookie crumbles.
that isnt rude just for a mistake
this is exactly why I don't do forums anymore
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Thread Starter
Junior Member

Joined: Apr 2014
Posts: 63
Likes: 1
From: White, Georgia
Car: 82 Pontiac Trans Am
Engine: 350 Vortec, sprayed
Transmission: T56
Axle/Gears: Spooled Strange 12 bolt, 3.73 gears
Re: Flywheel options
:shrug:
Sorry to hear that.
The Google isn't perfect. Most especially, It responds to whatever appears on The Interwebz the most, whether correct or not. Kind of a shame really butt that's the way the cookie crumbles.
Glad of course that no one was "rude", butt instead, merely FACTUAL. "Rude" would certainly be ... unwelcome.
Also glad that you did this time, got the answer you needed, ALONG WITH THE REASON WHY, and are so grateful for the info you received. I appreciate your heartfelt gratitude for being delivered out of your state of INCORRECT "belief". I feel slightly warm, even almost ... fuzzy.
Sorry to hear that.
The Google isn't perfect. Most especially, It responds to whatever appears on The Interwebz the most, whether correct or not. Kind of a shame really butt that's the way the cookie crumbles.
Glad of course that no one was "rude", butt instead, merely FACTUAL. "Rude" would certainly be ... unwelcome.
Also glad that you did this time, got the answer you needed, ALONG WITH THE REASON WHY, and are so grateful for the info you received. I appreciate your heartfelt gratitude for being delivered out of your state of INCORRECT "belief". I feel slightly warm, even almost ... fuzzy.
Joined: Sep 2005
Posts: 27,861
Likes: 2,427
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Flywheel options
The first paragraph was rude
whether you want to believe it or not
Glad you found out what you needed to know. Too bad you have to have ATTITUDE toward the people who set your feet on the path to TRUTH and away from BELIEF. Must really SUCK to live in a world where "belief" is more important than TRUTH.
Have a nice day.
Joined: Feb 2017
Posts: 4,174
Likes: 569
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Flywheel options
Did you order the CODE RED? 

Last edited by NoEmissions84TA; May 11, 2025 at 11:07 PM.
Joined: Jul 2000
Posts: 6,518
Likes: 91
From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Supreme Member

Joined: Aug 2021
Posts: 1,161
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From: CT
Car: 82 TA
Engine: Zz430 clone w a torquestorm blower
Transmission: Magnum f
Axle/Gears: Ford 9 w 4.11
Re: Flywheel options
To the OP. Ram clutch makes a conversion for a normal push style flywheel/disk/clutch and hydros. It's a kit. I'm pretty sure you can get it for 85 and older sbc. These eliminate all the stock lt1 clutch components and uses the stock lt1 trans and bell.
idk if this helps your conundrum or not.
idk if this helps your conundrum or not.
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