Small block to big block need help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jewing3886 · 11-11-2010, 07:45 PM

I have a 66 c10 350 engine turbo 350 trans, motor in stock location. I want to upgrade to 454. What all will I need I want to keep the turbo 350 trans? I was told a direct replacement but I came to the pros. Any info thanks ps the 454 is complete taking out of motor home.

NF65Fleetside · 11-11-2010, 10:04 PM

only thing you need is the 68-71 bbc mounts and your good to go....if the 454 is running tall valve covers then youll need to move the motor forward one hole position on the perch locations to clear the master cylinder/booster....if this has to be done then yes you will need to re-do driveshaft and trans mount location also. Can also just go with this kit from Truck/Car Shop ( 63-1281041 $129 ) or any other Truck parts store that has that mount/perch kit.
I ran a 454/th350 in stock location with standard valve covers and even full length headers, had full clearance to the distributor and oil stick.

**Captainfab** · 11-12-2010, 12:26 AM

Depending on what class the motorhome is, you may be able to use the complete motor mount assembly from it. I prefer to use the '73 and up motor mounts myself. You can use the '69-'71 big block motor mounts, but they can be a little hard to find and a little $$ when you do find them. Check out protrash64's build thread on his Suburban. He installed a big block in his Burb using the later model mounts.

http://www.67-72chevytrucks.com/vboa...=272654&page=8

You will need to trum the top flange of the frame through the engine compartment for both motor mount installation and header clearence. You can use the headers for the '73-'87 trucks.

raycow · 11-12-2010, 08:41 AM

You will need a 454 flexplate if the engine doesn't come with one. Don't try to use the one from the 350. The 454 flexplate has a balance weight on it that you can see.

Ray

TheDark1 · 11-12-2010, 10:09 AM

Awesome info. I'm thinking of this myself. subscribed--Jeff

jewing3886 · 11-12-2010, 03:22 PM

Will stock exhaust manifolds work ? I just dont like headers.

raycow · 11-12-2010, 04:43 PM

Quote:

Originally Posted by jewing3886

Will stock exhaust manifolds work ?

They will if you use the BB frame brackets.

Ray

bulldoggraphics · 11-13-2010, 05:42 PM

They Look and run great when done

**Chevy Fleetside** · 11-13-2010, 06:23 PM

This is the best I have for now.

11-11-2010, 07:45 PM	#1
jewing3886 Registered User Join Date: Nov 2008 Location: Hoschton Ga Posts: 15	Small block to big block need help I have a 66 c10 350 engine turbo 350 trans, motor in stock location. I want to upgrade to 454. What all will I need I want to keep the turbo 350 trans? I was told a direct replacement but I came to the pros. Any info thanks ps the 454 is complete taking out of motor home.

11-11-2010, 10:04 PM	#2
NF65Fleetside Registered User Join Date: Feb 2007 Location: Los Angeles Posts: 674	Re: Small block to big block need help only thing you need is the 68-71 bbc mounts and your good to go....if the 454 is running tall valve covers then youll need to move the motor forward one hole position on the perch locations to clear the master cylinder/booster....if this has to be done then yes you will need to re-do driveshaft and trans mount location also. Can also just go with this kit from Truck/Car Shop ( 63-1281041 $129 ) or any other Truck parts store that has that mount/perch kit. I ran a 454/th350 in stock location with standard valve covers and even full length headers, had full clearance to the distributor and oil stick.

11-12-2010, 12:26 AM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Small block to big block need help Depending on what class the motorhome is, you may be able to use the complete motor mount assembly from it. I prefer to use the '73 and up motor mounts myself. You can use the '69-'71 big block motor mounts, but they can be a little hard to find and a little $$ when you do find them. Check out protrash64's build thread on his Suburban. He installed a big block in his Burb using the later model mounts. http://www.67-72chevytrucks.com/vboa...=272654&page=8 You will need to trum the top flange of the frame through the engine compartment for both motor mount installation and header clearence. You can use the headers for the '73-'87 trucks. __________________ 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 Last edited by Captainfab; 11-12-2010 at 12:28 AM.

11-12-2010, 08:41 AM	#4
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Small block to big block need help You will need a 454 flexplate if the engine doesn't come with one. Don't try to use the one from the 350. The 454 flexplate has a balance weight on it that you can see. Ray __________________ Live more responsibly. Eat lower on the food chain. Eat vegetarians.

11-12-2010, 10:09 AM	#5
TheDark1 Intentionally Left Blank Join Date: Dec 2008 Location: Broussard, LA Posts: 355	Re: Small block to big block need help Awesome info. I'm thinking of this myself. subscribed--Jeff __________________ 1965 C-10 Short Fleet 468/TKO 5-Speed 2004 2500HD Crew 496/Ally Blacked Out (SOLD!!) 1997 Formula WS6 2004 Jeep Wrangler (Sold) 2013 Jeep Wrangler (Sold) 2017 Jeep Wrangler (Blacked Out on 35's) 2011 GMC D-Max Dually Denali 3500HD (Sold) 2015 GMC D-Max Dually Denali 3500HD (Sold) 2018 GMC D-Max Dually Denali 3500HD (Sold) 2020 D-Max Dually Denali on 33x12.50's 1979 GMC Short Bed Step-Side 4x4 350/350 Low Miles

11-12-2010, 03:22 PM	#6
jewing3886 Registered User Join Date: Nov 2008 Location: Hoschton Ga Posts: 15	Re: Small block to big block need help Will stock exhaust manifolds work ? I just dont like headers.

11-13-2010, 05:42 PM	#8
bulldoggraphics Registered User Join Date: Sep 2010 Location: Tucson, Arizona Posts: 30	Re: Small block to big block need help They Look and run great when done Attached Images

11-13-2010, 06:23 PM	#9
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,782	Re: Small block to big block need help This is the best I have for now. Attached Images __________________ "A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536

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