pontiac 455? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Okie Bucket · 02-02-2007, 08:38 PM

Anyone put in pontiac motor in these old trucks? I know BOP uses diff. bellhousing pattern on earlier years. Fuel lines need relocated to other side. Any ideas on mounts? Hope to not aggravate any die hard chebby guys. I know early GMC's ran pontiac for a bit. Thanks in advance for the replys.

409biscayne · 02-02-2007, 09:40 PM

The one i looked at in Spokane used an Olds 455 with the early diesel engine
mounts . Not exactly what you asked about , lol .
409

Longhorn Man · 02-02-2007, 09:48 PM

my longhorn had a Pontiac 350 in it when i got it, get some engine stands from a 73 - 87 2 wheel drive truck, that's the main part of the swap.
you'll need to re-route the fuel line, either run a new line on the other side of the frame, or just run it across the front cross member. Doing this can actually help cool the fuel
you'll want to locate a battery tray from a truck that has the Aux battery... this'll place it on the drivers side, like the pontiac starter. If you can't locate one, you could always get a much longer cable... go up a size or two due to the added length.
A BOP tranny, or adapter plate will be needed.

I would bolt the tranny in, acording to the shifter mounting brackets and stuff, then hang the engine in the frame rails, bolt the tranny in with 2 bolts, then install the motor mounts on the engine. (this is all much easier with the front clip removed) Now, you'll see where you need to install the engine stands. Some drilling may be needed. Mark the frame, remove the engine, and drill your holes.
After that, it's pretty much a nuts and bolts operation. Mine had no hammering done on the firewall, no cutting on anything.... nuts and bolts and a couple holes drilled.

Okie Bucket · 02-02-2007, 10:47 PM

Longhorn , thanks for the info. I see you run a caddy motor. I bet thats a torque monster. I've been working on a gto and toying with the idea of the 455 in my 67 stepside.

72armyswbtruck · 02-02-2007, 10:55 PM

you have to get a oil filter relocation kit for it to clear the frame rails

Longhorn Man · 02-03-2007, 11:26 AM

on the 350, it clears... and while it's been a few years since I even looked at a pontiac mortor, I'm thinking externally the 455 is a carbon coppy of the 350. As a matter of fact, the oil filter was close to the pan like a chevy.... however, it was too damn close to the exhaust IMO.

Longhorn Man · 02-03-2007, 11:26 AM

torque monster.... heh heh heh....yep. It's unfriggen real.

Okie Bucket · 02-03-2007, 08:08 PM

Longhorn, You're correct about the pontiac motors. Basically the same block used for 326-455. They changed bore and stroke to get more cubes. I have a lead on one but will have to pull if i want it. I'll probably look at my 400 when it warms up to see if it be worth my while. I have a mostly original longbed so i thought I might do something different with this one. Thanks for the reply. 72army: Thanks for the info will check. I believe the oil filter on my early 400 does come down beside pan similiar to my chevys.

68 short step · 02-03-2007, 08:32 PM

here is where the filter would go.... on the pass side just add a 90 degree elbow here

02-02-2007, 08:38 PM	#1
Okie Bucket Registered User Join Date: May 2005 Location: Warr Acres Oklahoma Posts: 13	pontiac 455? Anyone put in pontiac motor in these old trucks? I know BOP uses diff. bellhousing pattern on earlier years. Fuel lines need relocated to other side. Any ideas on mounts? Hope to not aggravate any die hard chebby guys. I know early GMC's ran pontiac for a bit. Thanks in advance for the replys.

02-02-2007, 09:40 PM	#2
409biscayne Senior Member Join Date: Nov 2005 Location: Spokane , Wash. Posts: 790	Re: pontiac 455? The one i looked at in Spokane used an Olds 455 with the early diesel engine mounts . Not exactly what you asked about , lol . 409 __________________ Can-Am Motorsports 37 Chev Coupe 331 4 speed 5.13 posi . ex-gasser . 64 Biscayne 409 2x4 4 speed 4.11 posi 65 Nova Wagon Drag Car 383 t400 (Dragin-Wagon) 68 c10 cst 396 t400 a/c buckets lwb 4.11 posi (SOLD)

02-02-2007, 09:48 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: pontiac 455? my longhorn had a Pontiac 350 in it when i got it, get some engine stands from a 73 - 87 2 wheel drive truck, that's the main part of the swap. you'll need to re-route the fuel line, either run a new line on the other side of the frame, or just run it across the front cross member. Doing this can actually help cool the fuel you'll want to locate a battery tray from a truck that has the Aux battery... this'll place it on the drivers side, like the pontiac starter. If you can't locate one, you could always get a much longer cable... go up a size or two due to the added length. A BOP tranny, or adapter plate will be needed. I would bolt the tranny in, acording to the shifter mounting brackets and stuff, then hang the engine in the frame rails, bolt the tranny in with 2 bolts, then install the motor mounts on the engine. (this is all much easier with the front clip removed) Now, you'll see where you need to install the engine stands. Some drilling may be needed. Mark the frame, remove the engine, and drill your holes. After that, it's pretty much a nuts and bolts operation. Mine had no hammering done on the firewall, no cutting on anything.... nuts and bolts and a couple holes drilled.

02-02-2007, 10:47 PM	#4
Okie Bucket Registered User Join Date: May 2005 Location: Warr Acres Oklahoma Posts: 13	Re: pontiac 455? Longhorn , thanks for the info. I see you run a caddy motor. I bet thats a torque monster. I've been working on a gto and toying with the idea of the 455 in my 67 stepside.

02-02-2007, 10:55 PM	#5
72armyswbtruck Registered User Join Date: Feb 2004 Location: Idaho Posts: 4,034	Re: pontiac 455? you have to get a oil filter relocation kit for it to clear the frame rails __________________ "Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!"

02-03-2007, 11:26 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: pontiac 455? on the 350, it clears... and while it's been a few years since I even looked at a pontiac mortor, I'm thinking externally the 455 is a carbon coppy of the 350. As a matter of fact, the oil filter was close to the pan like a chevy.... however, it was too damn close to the exhaust IMO.

02-03-2007, 11:26 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: pontiac 455? torque monster.... heh heh heh....yep. It's unfriggen real.

02-03-2007, 08:08 PM	#8
Okie Bucket Registered User Join Date: May 2005 Location: Warr Acres Oklahoma Posts: 13	Re: pontiac 455? Longhorn, You're correct about the pontiac motors. Basically the same block used for 326-455. They changed bore and stroke to get more cubes. I have a lead on one but will have to pull if i want it. I'll probably look at my 400 when it warms up to see if it be worth my while. I have a mostly original longbed so i thought I might do something different with this one. Thanks for the reply. 72army: Thanks for the info will check. I believe the oil filter on my early 400 does come down beside pan similiar to my chevys. __________________ 1967 Chevy small window SNB 350 auto 3/5 drop ps/pb {project} 1969 Chevy LWB 350 auto factory air mostly original rustfree (dependable cruiser) 2000 GMC Sierra X-Cab Z71 (Wife's ride/Grocery getter) 1969 Pontiac GTO (Restoration started. Purchased by Aunt new)

02-03-2007, 08:32 PM	#9
68 short step Senior Member Join Date: Aug 2005 Location: tulsa OK Posts: 3,070	Re: pontiac 455? here is where the filter would go.... on the pass side just add a 90 degree elbow here



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