67 chevy clutch question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

desrtrat · 01-12-2007, 12:26 AM

Ok, I have a 67 2wd, 283 and three on the tree. I just acquired a low miles 350 and am getting ready for the swap, my question is, what size is the clutch in this beast? I been looking on ebay and my options seem to be an 11" or a 10" I am pretty sure it is 10 but I would hate to buy the thing and then not have it fit, and I would like to have the part on hand before I start the swap, so I can get it in and out in one day. Any help would be greatly appreciated.

**WorkinLonghorn** · 01-12-2007, 01:14 AM

I think it came with an 11" but that doesn't mean you have to stay with that.My '69 came with a 350ci and has a 12" clutch.
My book shows that the straight 6 cylinder models got the 10".

smoked68 · 01-12-2007, 01:18 AM

my truck is a 350 with a muncie m21 and it is an 11" clutch. btw what type are you looking at. just went to the speed shop a couple days ago and priced a centerforce and it was like $350! I was trying to find one like I have in the mustang...ram hd for around $200 but they dont make one for that app.

jimfulco · 01-12-2007, 01:51 AM

Might see if a local parts place would let you buy both, then give you a refund for the one that won't fit.

If it's the smaller, you might want to look into a 10.4" clutch. My old 6-cylinder Nova ('69) came with a 9.125" clutch, but a 10" disc for a 307 fit, using the original pressure plate. I was pleased to find out that a 10.4" pressure plate and disc for a 350 also fit on the same flywheel, and was an even greater improvement than the 10" was. The 10.4" did require a shorter throwout bearing, since it had the bent-fingered diaphragm, whereas the others had a flat one. I don't know how much of this interchangeability applies to trucks, but it wouldn't surprise me if they're similar.

Brad · 01-12-2007, 04:15 AM

Quote:

Originally Posted by jimfulco

Might see if a local parts place would let you buy both, then give you a refund for the one that won't fit.

If it's the smaller, you might want to look into a 10.4" clutch. My old 6-cylinder Nova ('69) came with a 9.125" clutch, but a 10" disc for a 307 fit, using the original pressure plate. I was pleased to find out that a 10.4" pressure plate and disc for a 350 also fit on the same flywheel, and was an even greater improvement than the 10" was. The 10.4" did require a shorter throwout bearing, since it had the bent-fingered diaphragm, whereas the others had a flat one. I don't know how much of this interchangeability applies to trucks, but it wouldn't surprise me if they're similar.

Yep, they're the same. I just went through this with my T-5 swaps. Was gonna go with 9.125 but found a 10.4 that fit in the pressure plate. I ended up taking it back, but for an unrelated reason.

**truckdude239** · 01-12-2007, 06:55 AM

my 307 has an 11 inch clutch in it

**SOON2BLAZE** · 01-12-2007, 02:42 PM

Not to jack the thread, but.. if there a benifit in running a larger or smaller flywheel/clutch?

**WorkinLonghorn** · 01-12-2007, 06:48 PM

I'm not an expert but GM put a 12" in my truck and there must have been a sound engineering reason for the expense. The more torque an engine is capable of,the harder the clutch must hold. Also the more weight you must get moving the harder the clutch has to work,and the more heat that is generated.A larger flywheel and clutch will be able to absorb and dissipate this greater heat better than a small clutch.Thus the large clutch will be less likely to get glazed over,the Flywheel will be less likely to warp or experience other heat damage.The friction material will last longer in any event.-cougar

desrtrat · 01-12-2007, 11:12 PM

Thanks for the input, dunno what brand I was looking at, it was on ebay for like 49.99 or something like that, some cheap off brand, but thats ok, this is only temporary, I am going to put the body on a newer 4 wheel drive frame and use all of the running gear off of the donor truck.

**LockDoc** · 01-12-2007, 11:42 PM

-
There is some good info at this site. It says big block V-8 but it covers just about everything on Chevrolet Standard Shift Parts Interchange Information.

http://www.novak-adapt.com/knowledge...g_block_v8.htm

LockDoc

01-12-2007, 12:26 AM	#1
desrtrat Registered User Join Date: Jan 2007 Location: Lynndyl Utah Posts: 11	67 chevy clutch question Ok, I have a 67 2wd, 283 and three on the tree. I just acquired a low miles 350 and am getting ready for the swap, my question is, what size is the clutch in this beast? I been looking on ebay and my options seem to be an 11" or a 10" I am pretty sure it is 10 but I would hate to buy the thing and then not have it fit, and I would like to have the part on hand before I start the swap, so I can get it in and out in one day. Any help would be greatly appreciated. __________________ Hard work pays off in the future. . . . . . . Laziness pays off NOW!!!!!

01-12-2007, 01:14 AM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 67 chevy clutch question I think it came with an 11" but that doesn't mean you have to stay with that.My '69 came with a 350ci and has a 12" clutch. My book shows that the straight 6 cylinder models got the 10". __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

01-12-2007, 01:18 AM	#3
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Re: 67 chevy clutch question my truck is a 350 with a muncie m21 and it is an 11" clutch. btw what type are you looking at. just went to the speed shop a couple days ago and priced a centerforce and it was like $350! I was trying to find one like I have in the mustang...ram hd for around $200 but they dont make one for that app. __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom

01-12-2007, 01:51 AM	#4
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Re: 67 chevy clutch question Might see if a local parts place would let you buy both, then give you a refund for the one that won't fit. If it's the smaller, you might want to look into a 10.4" clutch. My old 6-cylinder Nova ('69) came with a 9.125" clutch, but a 10" disc for a 307 fit, using the original pressure plate. I was pleased to find out that a 10.4" pressure plate and disc for a 350 also fit on the same flywheel, and was an even greater improvement than the 10" was. The 10.4" did require a shorter throwout bearing, since it had the bent-fingered diaphragm, whereas the others had a flat one. I don't know how much of this interchangeability applies to trucks, but it wouldn't surprise me if they're similar.

01-12-2007, 06:55 AM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: 67 chevy clutch question my 307 has an 11 inch clutch in it __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-12-2007, 02:42 PM	#7
SOON2BLAZE Account Suspended Join Date: Aug 2005 Location: Southern UT Posts: 906	Re: 67 chevy clutch question Not to jack the thread, but.. if there a benifit in running a larger or smaller flywheel/clutch?

01-12-2007, 06:48 PM	#8
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: 67 chevy clutch question I'm not an expert but GM put a 12" in my truck and there must have been a sound engineering reason for the expense. The more torque an engine is capable of,the harder the clutch must hold. Also the more weight you must get moving the harder the clutch has to work,and the more heat that is generated.A larger flywheel and clutch will be able to absorb and dissipate this greater heat better than a small clutch.Thus the large clutch will be less likely to get glazed over,the Flywheel will be less likely to warp or experience other heat damage.The friction material will last longer in any event.-cougar __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

01-12-2007, 11:12 PM	#9
desrtrat Registered User Join Date: Jan 2007 Location: Lynndyl Utah Posts: 11	Re: 67 chevy clutch question Thanks for the input, dunno what brand I was looking at, it was on ebay for like 49.99 or something like that, some cheap off brand, but thats ok, this is only temporary, I am going to put the body on a newer 4 wheel drive frame and use all of the running gear off of the donor truck. __________________ Hard work pays off in the future. . . . . . . Laziness pays off NOW!!!!!

01-12-2007, 11:42 PM	#10
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,425	Re: 67 chevy clutch question - There is some good info at this site. It says big block V-8 but it covers just about everything on Chevrolet Standard Shift Parts Interchange Information. http://www.novak-adapt.com/knowledge...g_block_v8.htm LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -



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