big block clutch linkage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

russellmarling · 05-30-2006, 11:21 PM

I have installed a 454 and a Muncie M20 4 speed in my 70 GMC. What does the big block clutch linkage look like and where can I get one? I have a six cylinder linkage and a small block linkage and neither one of them fits. Did big block stickshifts exist? If they don't exist what can I do? The engine is mounted in the factory location with the correct big block mounts. Any help will be greatly appreciated. This one has me stumped and it is all that is keeping me from driving my truck!

**Green Machine** · 05-30-2006, 11:58 PM

My small block has an offset linkage rod and z-bar, it is all original, but I assume that would clear for a big block. I can get a closer pic tommorow if you want.

Brainchild · 05-31-2006, 12:06 AM

you could ask for one in the parts board,someone prolly has one lying around,maybe E-Bay will turn up something.A new hydrolic unit might be the answer,or make one out of the two you have.I'm assuming that they are too long due to the width of the block,(Never seen a BB Z-bar),cut it in half,and section it.Put it in place and make the arms go in the right postition,then weld it back together.In fact,and small piece of pipe big enough for the pieces to slide into would be nice,and then you can mark the right position,and just weld the sleeve in place.

**ScottH** · 05-31-2006, 11:44 AM

Gonna have to do the same myself, well one of these days.

Check out this thread from a while ago, might answer some of your questions:

http://www.67-72chevytrucks.com/vboa...d.php?t=191290

05-30-2006, 11:21 PM	#1
russellmarling Registered User Join Date: Jan 2006 Location: Highlands, NC Posts: 138	big block clutch linkage I have installed a 454 and a Muncie M20 4 speed in my 70 GMC. What does the big block clutch linkage look like and where can I get one? I have a six cylinder linkage and a small block linkage and neither one of them fits. Did big block stickshifts exist? If they don't exist what can I do? The engine is mounted in the factory location with the correct big block mounts. Any help will be greatly appreciated. This one has me stumped and it is all that is keeping me from driving my truck! __________________ '70 GMC SWB step-side- 454, 4 speed, air bags (in progress) '09 CTS-V M6 '03 Sierra SWB Z71 '82 Yamaha Seca XJ650R Turbo! '04 Yamaha FZ6

05-30-2006, 11:58 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: big block clutch linkage My small block has an offset linkage rod and z-bar, it is all original, but I assume that would clear for a big block. I can get a closer pic tommorow if you want. Attached Images __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

05-31-2006, 12:06 AM	#3
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	Re: big block clutch linkage you could ask for one in the parts board,someone prolly has one lying around,maybe E-Bay will turn up something.A new hydrolic unit might be the answer,or make one out of the two you have.I'm assuming that they are too long due to the width of the block,(Never seen a BB Z-bar),cut it in half,and section it.Put it in place and make the arms go in the right postition,then weld it back together.In fact,and small piece of pipe big enough for the pieces to slide into would be nice,and then you can mark the right position,and just weld the sleeve in place. __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website Last edited by Brainchild; 05-31-2006 at 12:07 AM.

05-31-2006, 11:44 AM	#4
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,187	Re: big block clutch linkage Gonna have to do the same myself, well one of these days. Check out this thread from a while ago, might answer some of your questions: http://www.67-72chevytrucks.com/vboa...d.php?t=191290

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