67 C20 250 ci to small block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ges55 · 02-23-2011, 12:21 PM

My 67 C20 with a 250 & 4 speed w/granny gear just took a crap. It started billowing white smoke while warming up in my driveway. (Thank God) Anyway, if it is more than just a head gasket, I was thinking about having a small block put in it. Would a 350 work with the current transmission? Thanks for any help. My son-in law is going to work on it for me.

brad_man_72 · 02-23-2011, 12:24 PM

yup

**special-K** · 02-23-2011, 12:55 PM

I think the clutch z-bar is different for V8s and the V8 will sit back in the firewall with the motor mounts where they are. I always move them to the forward holes (factory V8 location). I guess that would mean driveshaft work,but it's a pain with the distributor back into the firewall. I also recommend swapping to V8 motor mount towers.

ges55 · 02-23-2011, 12:56 PM

Is there anything specific regarding a pre or post '87 engine & the mounts or towers?

big_ac2001 · 02-23-2011, 01:33 PM

My truck was originally a 250ci/3 speed on the column. When I put the small block in it I left the motor mounts in the six cylinder position. This did make the engine set back further than a stock v8 truck but it also allowed me to use the original drive shaft. I am running an HEI distributor and even though it is close to the fire wall, there is enough room for it.

brad_man_72 · 02-23-2011, 02:53 PM

I'd put the sbc on the 6cyl mounts. It does fit and you won't have to mess with the driveshaft.
it might make it harder to work on the dist but you don't have to worry about moving your trans or crossmember or finding a z bar or new engine mounts.

LilD · 02-23-2011, 04:36 PM

I had a 69 6 cyl to V8 and the 70 I have now was a 6cyl now has a V8. Both with HEI and both in the 6 cyl position. I think the distributors easier to get to than on some of the other p.i.t.a. cars Ive had.

BLACK AND BLUE 67-72 · 02-23-2011, 04:56 PM

That is how my 67 was orginally a 250 4speed and they changed it to a 350 4 speed and left it in the orginal 6 cyl position. worked great even with HEI!!

02-23-2011, 12:21 PM	#1
ges55 BLACK SATIN Join Date: Jan 2009 Location: canton, IL Posts: 266	67 C20 250 ci to small block My 67 C20 with a 250 & 4 speed w/granny gear just took a crap. It started billowing white smoke while warming up in my driveway. (Thank God) Anyway, if it is more than just a head gasket, I was thinking about having a small block put in it. Would a 350 work with the current transmission? Thanks for any help. My son-in law is going to work on it for me. __________________ 67 C10 Fleetside LWB-283, 3 on the tree,power assisted steering, father-in-law bought it new 67 C20 Fleetside LWB-'85 305 V8 (original was 250 6 cyl), Holley 600 carb, full length Hedman headers, dual exhaust behind the back wheels, 4 spd , manual steering 85 C10 Silverado- 305ci

02-23-2011, 12:24 PM	#2
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: 67 C20 250 ci to small block yup

02-23-2011, 12:55 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: 67 C20 250 ci to small block I think the clutch z-bar is different for V8s and the V8 will sit back in the firewall with the motor mounts where they are. I always move them to the forward holes (factory V8 location). I guess that would mean driveshaft work,but it's a pain with the distributor back into the firewall. I also recommend swapping to V8 motor mount towers. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

02-23-2011, 12:56 PM	#4
ges55 BLACK SATIN Join Date: Jan 2009 Location: canton, IL Posts: 266	Re: 67 C20 250 ci to small block Is there anything specific regarding a pre or post '87 engine & the mounts or towers? __________________ 67 C10 Fleetside LWB-283, 3 on the tree,power assisted steering, father-in-law bought it new 67 C20 Fleetside LWB-'85 305 V8 (original was 250 6 cyl), Holley 600 carb, full length Hedman headers, dual exhaust behind the back wheels, 4 spd , manual steering 85 C10 Silverado- 305ci

02-23-2011, 01:33 PM	#5
big_ac2001 Registered User Join Date: Dec 2000 Location: Arkansas Posts: 47	Re: 67 C20 250 ci to small block My truck was originally a 250ci/3 speed on the column. When I put the small block in it I left the motor mounts in the six cylinder position. This did make the engine set back further than a stock v8 truck but it also allowed me to use the original drive shaft. I am running an HEI distributor and even though it is close to the fire wall, there is enough room for it. __________________ '71 Custom 10 lwb, 327ci, TH350 '49 chevy 3100 5 window truck. 235 six cylinder. 3 speed on the column.

02-23-2011, 02:53 PM	#6
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: 67 C20 250 ci to small block I'd put the sbc on the 6cyl mounts. It does fit and you won't have to mess with the driveshaft. it might make it harder to work on the dist but you don't have to worry about moving your trans or crossmember or finding a z bar or new engine mounts.

02-23-2011, 04:36 PM	#7
LilD Registered User Join Date: Oct 2009 Location: Tucson, AZ Posts: 186	Re: 67 C20 250 ci to small block I had a 69 6 cyl to V8 and the 70 I have now was a 6cyl now has a V8. Both with HEI and both in the 6 cyl position. I think the distributors easier to get to than on some of the other p.i.t.a. cars Ive had.

02-23-2011, 04:56 PM	#8
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: 67 C20 250 ci to small block That is how my 67 was orginally a 250 4speed and they changed it to a 350 4 speed and left it in the orginal 6 cyl position. worked great even with HEI!! __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA



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