Clutch question when swapping engines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 05-07-2002, 11:11 AM

When I go from my inline to the 350, will i have to replace the clutch with a 12"? I was talking with a mechanic buddy of mine yesterday and he figured I should go with a bigger clutch. but I figured if i am staying with the 3 speed tranny, i might as well stay with the one I have. Any thought on this

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72 C/10 LWB 2wd
250 inline 6, 3 speed column shift. Soon to have a total facelift.

O'l Buck · 05-07-2002, 11:16 AM

I'm not sure what's reccomended, but if I remember right, most v-8s use a 12" clutch, and if I was changing engines, or even pulling an engine to reseal or something, i'd replace the clutch, just because the $$ to replace now makes more sense than pulling the engine again when the old used clutch goes kaput.

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Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

Angel girl: 67 Cutlass convertible
330, 3spd stick

Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

no name yet: 72 442 under serious construction
my site:
http://communities.msn.com/Beastonabudget/homepage

okietruck · 05-07-2002, 11:47 AM

I recently swapped the I6 for a V8 in my 72 and used the same clutch (stock 10 1/2" diaphram) with no problems. You may have to go to a larger flywheel if you use a 12" clutch. I have a heavy-duty 11" I plan on putting in mine when the time comes.

tom hand · 05-07-2002, 12:17 PM

If the clutch is in good shape I would use it,becuase the weak point will be that trans behind a V-8. If anything shows the slightist bit of abuse now is the time to change it.

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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS

05-07-2002, 11:11 AM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	Clutch question when swapping engines When I go from my inline to the 350, will i have to replace the clutch with a 12"? I was talking with a mechanic buddy of mine yesterday and he figured I should go with a bigger clutch. but I figured if i am staying with the 3 speed tranny, i might as well stay with the one I have. Any thought on this ------------------ 72 C/10 LWB 2wd 250 inline 6, 3 speed column shift. Soon to have a total facelift. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-07-2002, 11:16 AM	#2
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	I'm not sure what's reccomended, but if I remember right, most v-8s use a 12" clutch, and if I was changing engines, or even pulling an engine to reseal or something, i'd replace the clutch, just because the $$ to replace now makes more sense than pulling the engine again when the old used clutch goes kaput. ------------------ Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84 ralleys and 31/10.5s Angel girl: 67 Cutlass convertible 330, 3spd stick Greener: 90 GMC Jimmy 350/auto Chad Stephens Orleans,NE no name yet: 72 442 under serious construction my site: http://communities.msn.com/Beastonabudget/homepage __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

05-07-2002, 11:47 AM	#3
okietruck Registered User Join Date: Apr 2002 Location: Tulsa, OK, USA Posts: 117	I recently swapped the I6 for a V8 in my 72 and used the same clutch (stock 10 1/2" diaphram) with no problems. You may have to go to a larger flywheel if you use a 12" clutch. I have a heavy-duty 11" I plan on putting in mine when the time comes. __________________ '72 LWB Stepside

05-07-2002, 12:17 PM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	If the clutch is in good shape I would use it,becuase the weak point will be that trans behind a V-8. If anything shows the slightist bit of abuse now is the time to change it. ------------------ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS



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