pontiac 400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

flaco · 01-05-2003, 01:57 PM

Hey guys, I searched the archives for info on installing a pontiac in my pickup but I haven't seen any pics of the swap. I was wondering if anyone has any pics on this. Judging by the archives it seems that it would be a popular swap if we only new how to do it. I have the engine and the bellhousing should I go with a 4 speed. If that turns out to be to much trouble I have a 400 aoutomatic to use as well. Any help would be appreciated. Hopefully I will get started on this project in the next couple of months.

>X< · 01-05-2003, 02:51 PM

i've got a 400 pontiac sitting in my shop. my truck has a 350 pontiac in it, all the pontiacs, 350-455 are direct replacement or each other. my motor mounts are homeade out of sb chevy mounts i think.

Longhorn Man · 01-05-2003, 05:04 PM

My one ton had a pontiac 350 in it when I got it.
It was set up with '72 big block towers, and then the engine boltrd dang near straight in. They used some lug nits as spacers between the mounts and the towers.
On your Th400, don't forget that a chevy tranny will not bolt up to a Pontiac engine. You'll need one with a BOP bellhousing.
I can try to round up my pictures when I get home if needed. (I'm at a friends house right now)

imaindianoutlaw · 01-05-2003, 06:43 PM

some one else here has a pontiac block in their truck! Mail has some pics for sure! duh! I didnt see the above post!

Maximum Overdrive · 01-05-2003, 10:00 PM

I put a 455 in a 69 I had once. You can pretty much put anything you want if you have the skills to do it. We just got a 68 Chevy pickup that some JA put in some ford motor. The hood is not even on the truck because the motor sits so darn high. Truck doesnt even run. Next time Im down at the shop I will try to get a picture of it.

Longhorn Man · 01-05-2003, 11:28 PM

Here is the belhousing bolt pattern for a BOP;

Here is the Pontiac 350 sittin in there nice and low. Plenty of room in there for it.

Hereis a shot of the motor mounts.

And here the mounts are without the engine. If memory serves, there was a lig nut as a spacer on the passenger mount...but it has been a while though.

01-05-2003, 01:57 PM	#1
flaco Registered User Join Date: Jul 2002 Location: denver Posts: 33	pontiac 400 Hey guys, I searched the archives for info on installing a pontiac in my pickup but I haven't seen any pics of the swap. I was wondering if anyone has any pics on this. Judging by the archives it seems that it would be a popular swap if we only new how to do it. I have the engine and the bellhousing should I go with a 4 speed. If that turns out to be to much trouble I have a 400 aoutomatic to use as well. Any help would be appreciated. Hopefully I will get started on this project in the next couple of months. __________________ 67 Grand prix convertable 68 Chevy 3/4 ton truck 66 Cadillac sedan deville

01-05-2003, 02:51 PM	#2
>X< registered IWATA user Join Date: Feb 2002 Location: Baton Rouge Posts: 4,481	i've got a 400 pontiac sitting in my shop. my truck has a 350 pontiac in it, all the pontiacs, 350-455 are direct replacement or each other. my motor mounts are homeade out of sb chevy mounts i think. __________________ -'63 Ford Fairlane 500 coupe, v8, auto, faded and rusty. awaiting built roller 302 and some flat black -'99 Honda Prelude. vtech/5spd. no pipe, no intake, bone stock. awaiting new top end. -01 GMC Yukon SLT 5.3 dented and scratched with a noisy tranny. Take off that Von Dutch hat before i stab you with a 000 Mack.

01-05-2003, 06:43 PM	#4
imaindianoutlaw GMC SHORT FLEET F/S Join Date: Jun 2000 Location: SOUTH WILLIAMSPORT PENNSYLVANNIA Posts: 2,117	some one else here has a pontiac block in their truck! Mail has some pics for sure! duh! I didnt see the above post! __________________ CHARLES WADE HEIN HVACR FOREMAN. LEWISBURG U.S.P. Last edited by imaindianoutlaw; 01-05-2003 at 06:47 PM.

01-05-2003, 10:00 PM	#5
Maximum Overdrive December 21, 2012 Join Date: Apr 2000 Location: Black Eagle, Montana Posts: 1,633	I put a 455 in a 69 I had once. You can pretty much put anything you want if you have the skills to do it. We just got a 68 Chevy pickup that some JA put in some ford motor. The hood is not even on the truck because the motor sits so darn high. Truck doesnt even run. Next time Im down at the shop I will try to get a picture of it. __________________ *"!Ama Sua, Ama Kjella, Ama Lllulla!"*

01-05-2003, 05:04 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	My one ton had a pontiac 350 in it when I got it. It was set up with '72 big block towers, and then the engine boltrd dang near straight in. They used some lug nits as spacers between the mounts and the towers. On your Th400, don't forget that a chevy tranny will not bolt up to a Pontiac engine. You'll need one with a BOP bellhousing. I can try to round up my pictures when I get home if needed. (I'm at a friends house right now)

01-05-2003, 11:28 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Here is the belhousing bolt pattern for a BOP; Here is the Pontiac 350 sittin in there nice and low. Plenty of room in there for it. Hereis a shot of the motor mounts. And here the mounts are without the engine. If memory serves, there was a lig nut as a spacer on the passenger mount...but it has been a while though.



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