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T56 behind a 496 BBC?

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Old 06-30-2009, 10:02 PM   #1
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T56 behind a 496 BBC?

I have a t56 in my sbc car currently. I am building a mark vi 496 BBC. The engine is a 1 pc rms, and its internally balanced like my current sbc. From what i understand the flywheel and bellhousing should work fine. My question is what will i have to do to the trans to make it hold up to well over 500 ft lbs. What clutch do you suggest, internal parts ect. I plan to eventually use a 4l80e but want to try the 6 speed first. Any help is appriciated. Thanks.
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Old 07-01-2009, 05:38 AM   #2
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Re: T56 behind a 496 BBC?

The T56 is conservatively rated to 450lb-ft, so your 500 isn't beyond a stock unit. (If you lighten the car, even better..)

The common upgrades to the T56 in order are:
- Upgrade to Carbon fiber blocker rings
- steel 3/4 shift fork
- bronze shift fork pads (all 4 forks)
- billet steel synchro keys (3/4-definitely, 1/2-recommended, 5/6-optional, Rev-rarely)

- Upgrade 2nd gear with larger engagement teeth
- Upgrade to viper output shaft

The last two to take the T56 from ~700lb-ft to about 900lb-ft..

McLeod makes twin-disk clutches that will hold that much power.
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Old 07-01-2009, 02:58 PM   #3
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Re: T56 behind a 496 BBC?

Could you guys help me out.
I am putting a T-56 bwhind a 454 Gen VI. There is a guy selling a flywheel from a mercruiser 454 Gen VI. Do you guys know if thie will fit.
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Old 07-01-2009, 07:18 PM   #4
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Re: T56 behind a 496 BBC?

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Originally Posted by GSRMmi31 View Post
Could you guys help me out.
I am putting a T-56 bwhind a 454 Gen VI. There is a guy selling a flywheel from a mercruiser 454 Gen VI. Do you guys know if thie will fit.
(Might want to consider starting your own new post instead of hijacking another..)

Does the Mercruiser have a T56 on it now? The LT1 T56 uses a different flywheel than most other transmissions, so even if the flywheel will fit, it won't work with a LT1 T56 unless it's designed for it..
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Old 07-01-2009, 10:53 PM   #5
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Re: T56 behind a 496 BBC?

Relax bud it Was just a question. I appreciate your help.
Thanks
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Old 07-06-2009, 09:20 AM   #6
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Re: T56 behind a 496 BBC?

Nope, it won't work. Leave the boat parts with the boats. You need a custom flywheel from McLeod or Centerforce to match the imbalance of your 454.
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Old 07-07-2009, 10:48 PM   #7
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Re: T56 behind a 496 BBC?

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Originally Posted by GSRMmi31 View Post
Relax bud it Was just a question. I appreciate your help.
Thanks
Still considered hijacking :P
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