1966 C20 327 Original Engine Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Calichevyv8 · 07-28-2015, 12:07 PM

Hey Guys, I just sold my 69 C20 and am picking up a 66 C20 in a couple days. I only have one engine bay pic for now but will snap more once I have the truck. It's supposed to be original 327 and TH400. Any specifics you can gather based off this picture? I know there were some different carbs that came on these, does this look correct for the engine? Thanks!

**jayoldschool** · 07-28-2015, 05:40 PM

Looks like the Rochester 4GC in my 65 Impala 327.
Posted via Mobile Device

Grandpa54 · 07-28-2015, 10:13 PM

Is it green

Calichevyv8 · 07-28-2015, 10:21 PM

I'm just going based off this picture too. Looks like the drivers valve cover and head have some teal green on them.

Did Rochester 4GC's come on these?

LT1 Burb · 07-28-2015, 10:26 PM

Yep, Rochester 4GC, factory AC bracket, teal motor so original.

TJ's Chevy · 07-28-2015, 11:01 PM

Even has the factory offset P/B setup! My 64 GMC has that to.

**Captainfab** · 07-29-2015, 12:21 AM

Yep, looks original to me. I would say it more than likely has the power assist steering also.

Calichevyv8 · 07-29-2015, 01:15 PM

Awesome, that's all good news. Where on the TH400 are the numbers to check?

HOTFUN · 07-29-2015, 02:51 PM

Looks correct for a truck 327 turbo 400. Has the electric kickdown power wire coming out and down from the firewall grommet in middle that goes to the kick down switch on the drivers side of carb. Only turbo 400 had that. For numbers the block number stamped on the engine pad front passenger side of engine will end in YH for the 327/turbo 400 coded block. The tranny will have an aluminum tag if it is still there on the transmission side with serial number and build month/year for these early turbo 400's. Mark

**yelmer** · 07-30-2015, 12:21 AM

the tranny tag will say "CT"

**yelmer** · 07-30-2015, 12:25 AM

Also from the engine bay picture i would say the truck was sold new in calif.

**yelmer** · 07-30-2015, 12:26 AM

The carb number should be 7025125 from the carb tag

Calichevyv8 · 07-31-2015, 12:39 AM

Quote:

Originally Posted by yelmer

Also from the engine bay picture i would say the truck was sold new in calif.

Nice catch, it is a CA truck. It has a protect o plate too.

Calichevyv8 · 07-31-2015, 08:07 PM

YH engine stamp matching the protect-o-plate and 66 TH400 matching the M49 on the protect-o-plate. Not seeing a tag on the Rochester, are there any other areas on it where numbers would be stamped?

HOTFUN · 07-30-2015, 12:32 AM

Good eye on the Fremont, CA build. Extra plumbing for that pvc system should mean no" engine conversion" from the Fremont factory. If the original seat is there it may have a build sheet attached to the spring frame.

**yelmer** · 07-30-2015, 12:34 AM

I agree .it would be nice to have the buildsheet or spid sheet

HOTFUN · 07-30-2015, 12:42 AM

I am trying to build a restored version of that exact power team removed from a 66 C20 and detailed into a 66 c10 short fleet.

geezer#99 · 07-30-2015, 12:49 AM

Quote:

Originally Posted by HOTFUN

I tried to build a restored version of that exact power team removed from a 66 C20 and detailed into a 66 c10 short fleet.

Nice looking motor!!
The hei even blends in!!

Calichevyv8 · 07-30-2015, 06:28 PM

Ok, I'll check out those other areas once I pick it up and report back. Nice setup hotfun

07-28-2015, 12:07 PM	#1
Calichevyv8 Registered User Join Date: Jul 2014 Location: San Diego, CA Posts: 40	1966 C20 327 Original Engine Question Hey Guys, I just sold my 69 C20 and am picking up a 66 C20 in a couple days. I only have one engine bay pic for now but will snap more once I have the truck. It's supposed to be original 327 and TH400. Any specifics you can gather based off this picture? I know there were some different carbs that came on these, does this look correct for the engine? Thanks!

07-28-2015, 05:40 PM	#2
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,169	Re: 1966 C20 327 Original Engine Question Looks like the Rochester 4GC in my 65 Impala 327. Posted via Mobile Device

07-28-2015, 10:13 PM	#3
Grandpa54 Registered User Join Date: Mar 2011 Location: Bakersfield Ca. Posts: 417	Re: 1966 C20 327 Original Engine Question Is it green

07-28-2015, 10:21 PM	#4
Calichevyv8 Registered User Join Date: Jul 2014 Location: San Diego, CA Posts: 40	Re: 1966 C20 327 Original Engine Question I'm just going based off this picture too. Looks like the drivers valve cover and head have some teal green on them. Did Rochester 4GC's come on these?

07-28-2015, 10:26 PM	#5
LT1 Burb Registered User Join Date: Sep 2010 Location: Winchester Oregon, formerly Vancouver BC Posts: 2,949	Re: 1966 C20 327 Original Engine Question Yep, Rochester 4GC, factory AC bracket, teal motor so original.

07-28-2015, 11:01 PM	#6
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: 1966 C20 327 Original Engine Question Even has the factory offset P/B setup! My 64 GMC has that to. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

07-29-2015, 12:21 AM	#7
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,250	Re: 1966 C20 327 Original Engine Question Yep, looks original to me. I would say it more than likely has the power assist steering also. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-29-2015, 01:15 PM	#8
Calichevyv8 Registered User Join Date: Jul 2014 Location: San Diego, CA Posts: 40	Re: 1966 C20 327 Original Engine Question Awesome, that's all good news. Where on the TH400 are the numbers to check?

07-29-2015, 02:51 PM	#9
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	Re: 1966 C20 327 Original Engine Question Looks correct for a truck 327 turbo 400. Has the electric kickdown power wire coming out and down from the firewall grommet in middle that goes to the kick down switch on the drivers side of carb. Only turbo 400 had that. For numbers the block number stamped on the engine pad front passenger side of engine will end in YH for the 327/turbo 400 coded block. The tranny will have an aluminum tag if it is still there on the transmission side with serial number and build month/year for these early turbo 400's. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

07-30-2015, 12:21 AM	#10
yelmer Registered User Join Date: Aug 2008 Location: greeley colorado Posts: 1,360	Re: 1966 C20 327 Original Engine Question the tranny tag will say "CT"

07-30-2015, 12:25 AM	#11
yelmer Registered User Join Date: Aug 2008 Location: greeley colorado Posts: 1,360	Re: 1966 C20 327 Original Engine Question Also from the engine bay picture i would say the truck was sold new in calif.

07-30-2015, 12:26 AM	#12
yelmer Registered User Join Date: Aug 2008 Location: greeley colorado Posts: 1,360	Re: 1966 C20 327 Original Engine Question The carb number should be 7025125 from the carb tag

07-31-2015, 08:07 PM	#14
Calichevyv8 Registered User Join Date: Jul 2014 Location: San Diego, CA Posts: 40	Re: 1966 C20 327 Original Engine Question YH engine stamp matching the protect-o-plate and 66 TH400 matching the M49 on the protect-o-plate. Not seeing a tag on the Rochester, are there any other areas on it where numbers would be stamped?

07-30-2015, 12:32 AM	#15
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	Re: 1966 C20 327 Original Engine Question Good eye on the Fremont, CA build. Extra plumbing for that pvc system should mean no" engine conversion" from the Fremont factory. If the original seat is there it may have a build sheet attached to the spring frame. __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed"

07-30-2015, 12:34 AM	#16
yelmer Registered User Join Date: Aug 2008 Location: greeley colorado Posts: 1,360	Re: 1966 C20 327 Original Engine Question I agree .it would be nice to have the buildsheet or spid sheet



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07-30-2015, 12:42 AM	#17
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	Re: 1966 C20 327 Original Engine Question I am trying to build a restored version of that exact power team removed from a 66 C20 and detailed into a 66 c10 short fleet. Attached Images __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" Last edited by HOTFUN; 07-30-2015 at 12:52 AM.

07-30-2015, 06:28 PM	#19
Calichevyv8 Registered User Join Date: Jul 2014 Location: San Diego, CA Posts: 40	Re: 1966 C20 327 Original Engine Question Ok, I'll check out those other areas once I pick it up and report back. Nice setup hotfun

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