? for those with BB, headers & SM465 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big Bad 1972 Blazer · 05-20-2005, 09:37 PM

Hey guys...

? for everybody running a big block with headers & an SM465. I've got a set of Hedman long headers on my 496 (bolted in almost perfectly). I left the 496 in the stock location (dimpled the firewall for clearance) and was cruising along bolting everything in...until I got to the clutch linkage. The main pipe runs directly in front of the hole for the pivot on the motor side. I don't think that I could bend the header far enough to even get a pivot to screw in...let alone to get enough clearance for motor rock etc. Anyway, I was curious to see what everybody else has done to solve similar problems. I'm probably going to go with a hydraulic clutch set up, but if somebody has a creative idea...I'd love to hear it.

Thanks in advance!

**Yukon Jack** · 05-21-2005, 08:03 AM

I am running a hydraulic clutch so I don't have a problem but I did notice that my tube was also directly in line with that hole. My headers are the Dynomax headers for a 2wd 67-87 or so truck. You might PM burt4x4. He is using Thorley headers I believe and could look to see if those cause interference. He is also using a hydraulic clutch.

*bisquik65* · 05-21-2005, 12:11 PM

You simply need 73-85 clutch linkage,z-bar and frame bracket..I have done this...Go under the footnotes in the Big block header # and it will tell you this same thing...And it works fine...

Big Bad 1972 Blazer · 05-21-2005, 10:30 PM

bisquik65...

Thanks for the tip...I missed that one in the hedder notes

.

Does the pivot for the 73 & up line up with the rearward hole on the block? I've got a z-bar from a 454'd '76. I never enough thought of trying to line it up at that location. That leaves me a frame bracket to score and a couple of holes tor drill in the frame (I assume)...time for another trip to the local salvage yard.....

*bisquik65* · 05-22-2005, 09:13 AM

Yes it will use the rear hole in the block now,all you need is a bracket..You will also need the 73-85 clutch rod from the pedal to z-bar. And you need to lower the hole where that rod comes out of the firewall..I forgot about that part.. A Big Block was never put in a 67-72 4x4!!!factory.

Big Bad 1972 Blazer · 05-22-2005, 10:14 PM

True about the 67-72's not comming factory with a BB...but boy do they look good with one sitting in the engine bay!!!!

Thanks again for the info. I now should have my '72 driveable by the end of Memorial weekend. Like a kind around x-mas...I can't wait.

05-20-2005, 09:37 PM	#1
Big Bad 1972 Blazer Registered User Join Date: Jan 2005 Location: Armada, MI 48188 Posts: 83	? for those with BB, headers & SM465 Hey guys... ? for everybody running a big block with headers & an SM465. I've got a set of Hedman long headers on my 496 (bolted in almost perfectly). I left the 496 in the stock location (dimpled the firewall for clearance) and was cruising along bolting everything in...until I got to the clutch linkage. The main pipe runs directly in front of the hole for the pivot on the motor side. I don't think that I could bend the header far enough to even get a pivot to screw in...let alone to get enough clearance for motor rock etc. Anyway, I was curious to see what everybody else has done to solve similar problems. I'm probably going to go with a hydraulic clutch set up, but if somebody has a creative idea...I'd love to hear it. Thanks in advance!

05-21-2005, 08:03 AM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	I am running a hydraulic clutch so I don't have a problem but I did notice that my tube was also directly in line with that hole. My headers are the Dynomax headers for a 2wd 67-87 or so truck. You might PM burt4x4. He is using Thorley headers I believe and could look to see if those cause interference. He is also using a hydraulic clutch. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

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05-21-2005, 12:11 PM	#3
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	You simply need 73-85 clutch linkage,z-bar and frame bracket..I have done this...Go under the footnotes in the Big block header # and it will tell you this same thing...And it works fine...

05-21-2005, 10:30 PM	#4
Big Bad 1972 Blazer Registered User Join Date: Jan 2005 Location: Armada, MI 48188 Posts: 83	bisquik65... Thanks for the tip...I missed that one in the hedder notes . Does the pivot for the 73 & up line up with the rearward hole on the block? I've got a z-bar from a 454'd '76. I never enough thought of trying to line it up at that location. That leaves me a frame bracket to score and a couple of holes tor drill in the frame (I assume)...time for another trip to the local salvage yard.....

05-22-2005, 09:13 AM	#5
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	Yes it will use the rear hole in the block now,all you need is a bracket..You will also need the 73-85 clutch rod from the pedal to z-bar. And you need to lower the hole where that rod comes out of the firewall..I forgot about that part.. A Big Block was never put in a 67-72 4x4!!!factory.

05-22-2005, 10:14 PM	#6
Big Bad 1972 Blazer Registered User Join Date: Jan 2005 Location: Armada, MI 48188 Posts: 83	True about the 67-72's not comming factory with a BB...but boy do they look good with one sitting in the engine bay!!!! Thanks again for the info. I now should have my '72 driveable by the end of Memorial weekend. Like a kind around x-mas...I can't wait.



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