clutch pivot on 400 sb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

robby · 05-03-2003, 05:19 PM

I just checked out the motor in my 79 k20 that I am going to part out on the advice from a board member because I asssumed that I could put it in my 72 K10 with a four speed. Well lo and behold the block has a boss for the pivot but it is not drilled and tapped for it. Question is can I drill and tap it successfully or is it not worth the hassle? I need to find a flywheel for a 400 anyway. Maybe I should fix mine or find another 350 for my K10-Thoughts?

lpaine · 05-03-2003, 06:26 PM

You can drill and tap it, but it's a lot easier with the engine out- which I assume you're doing anyway. I'd say it would be a simple enough 2 or 3-beer-job.

Chevy Wrench · 05-03-2003, 07:40 PM

More than likely, you will end up drilling into the water jacket. If so, dont be alarmed, just make sure to seal the threads with a good sealant.

robby · 05-03-2003, 11:27 PM

so not a real high skill job? I will have it out of the truck.

spinning wheels · 05-04-2003, 12:31 AM

When I bought a 400 small block, (this was many years ago), to install in my 70 Z28. I found out that GM never installed a 400 small block with a stick. So, no flywheel was available. Since the motor is externally balanced, none of the other small block's flywheel would work, they are internally balanced. Hopefully you won't run into that problem. I mean, I hope you can find an aftermarket flywheel that won't set you back a whole bunch of bucks. I can't say that it has never been done, just not sure if its the best or most cost effective way to go.

JimKshortstep4x4 · 05-04-2003, 06:38 AM

I have a 400 small block installed in my 65 SS with a M 22. The bell housing that I am using has the clutch pivot tapped hole in it and for this application it works well.

Flywheels are available, I bought mine from Northern.

Jim

robby · 05-04-2003, 10:21 AM

I have another thread about the flywheel, basic consensus is that you can buy a flywheel for about $150 new. I think there are a few trucks in the 70's that might have had a manual tranny behind a 400. but I won't wear myself out looking for one. Thanks

robby · 05-04-2003, 12:36 PM

Just looked up the 400 flywheel in Norhtern's web site-$109.

05-03-2003, 05:19 PM	#1
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	clutch pivot on 400 sb I just checked out the motor in my 79 k20 that I am going to part out on the advice from a board member because I asssumed that I could put it in my 72 K10 with a four speed. Well lo and behold the block has a boss for the pivot but it is not drilled and tapped for it. Question is can I drill and tap it successfully or is it not worth the hassle? I need to find a flywheel for a 400 anyway. Maybe I should fix mine or find another 350 for my K10-Thoughts? __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

05-03-2003, 06:26 PM	#2
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	You can drill and tap it, but it's a lot easier with the engine out- which I assume you're doing anyway. I'd say it would be a simple enough 2 or 3-beer-job. __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

05-03-2003, 07:40 PM	#3
Chevy Wrench former desert rat Join Date: Feb 2003 Location: salt lake city, utah Home of the 3 M's Mormons, methlabs and minivans Posts: 320	More than likely, you will end up drilling into the water jacket. If so, dont be alarmed, just make sure to seal the threads with a good sealant. __________________ 94 Chevy Silverado Ext cab 4/6 drop w/ 18's and 2500watt system (work truck). 67 Chevy swb under const. frame off custom, 20's, bagged and a large rat under the hood,and a 1940 Chevy truck under const.

05-03-2003, 11:27 PM	#4
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	so not a real high skill job? I will have it out of the truck. __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

05-04-2003, 12:31 AM	#5
spinning wheels Registered User Join Date: Sep 2001 Location: Hacienda Heights, California USA Posts: 474	When I bought a 400 small block, (this was many years ago), to install in my 70 Z28. I found out that GM never installed a 400 small block with a stick. So, no flywheel was available. Since the motor is externally balanced, none of the other small block's flywheel would work, they are internally balanced. Hopefully you won't run into that problem. I mean, I hope you can find an aftermarket flywheel that won't set you back a whole bunch of bucks. I can't say that it has never been done, just not sure if its the best or most cost effective way to go. __________________ '72 GMC custom camper 350/350

05-04-2003, 06:38 AM	#6
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I have a 400 small block installed in my 65 SS with a M 22. The bell housing that I am using has the clutch pivot tapped hole in it and for this application it works well. Flywheels are available, I bought mine from Northern. Jim

05-04-2003, 10:21 AM	#7
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	I have another thread about the flywheel, basic consensus is that you can buy a flywheel for about $150 new. I think there are a few trucks in the 70's that might have had a manual tranny behind a 400. but I won't wear myself out looking for one. Thanks __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

05-04-2003, 12:36 PM	#8
robby Semper Fidelis Join Date: Dec 2001 Location: Cedar City, Utah Posts: 654	Just looked up the 400 flywheel in Norhtern's web site-$109. __________________ 72 Chevy C 20 with 402 For sale 85 GMC K2500 83 Trans Am Cedar City, Utah (Missouri Native)

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