Inline 6 to V8 swap w/ 4 speed
 

I have a '72 C10 Pickup that currently has a 250 Inline 6 that i want to change to a 350. I would like to keep the 4 speed manual transmission that is in the truck and i was wondering if that bellhousing bolts right up to a 350? i heard somewhere that i can use the 6 cylinder mounts and use them to mount the V8 in the rearward position? is this true? and if it is, does the driveshaft length change? any information on this would be helpful, thanks

Re: Inline 6 to V8 swap w/ 4 speed
 

You can do that.It won`t change the driveshaft length because the trans stays put.You need a V8 flywheel and clutch z-bar.

Re: Inline 6 to V8 swap w/ 4 speed
 

I have the same thing going on, I got a 70 gmc 1/2 ton with a 292 w/3 on the tree 4x4 i want to drop in the 350 that is in my 71 3/4 ton 4spd, so i could just take the 292 out and drop in the 350 no probs?

pat

Re: Inline 6 to V8 swap w/ 4 speed
 

:fb:

Re: Inline 6 to V8 swap w/ 4 speed
 

:fb:

Re: Inline 6 to V8 swap w/ 4 speed
 

I was under the inpresion that the motor mounts moved forward to the next set of holes in the frame. As long as the tailshaft of the tranny doesn't move fore of aft your driveshaft length will not change.

Re: Inline 6 to V8 swap w/ 4 speed
 

The right hand motor stand or perch is specific to a 292. Let me know if you do a swap and want to sell it.

Re: Inline 6 to V8 swap w/ 4 speed
 

on the 250 6cly just unbolt the motor and drop the v8 in place, you could even bolt a BB there (might have to clearance the firewall though). You will need a v8 clutch ball stud for the v8 4x4 or modify the 6cyl one. It is an easy wap.

Re: Inline 6 to V8 swap w/ 4 speed
 

I've done this swap several times, it's so easy, the V8 almost bolts itself in! Engine mounting is a piece of cake, areas that cause headaches are: above mentioned clutch linkage, and exhaust system. Literally everything else bolts right up.

Re: Inline 6 to V8 swap w/ 4 speed
 

So for my 64 would it be the same? Use the more forward set of holes on the frame for the new mounts and my drive shaft should still be good?

Re: Inline 6 to V8 swap w/ 4 speed
 

2 wheel or 4 wheel drive. i just did the 4wd 292 to 350 swap and the mounts are different. I had to change the crossmember and go to the V-8 mounts. The 2 wheel drive looks a little easier. good luck. s.

Re: Inline 6 to V8 swap w/ 4 speed
 

if you aren't relocating the tranny, then just leave it in the truck, and bolt the new engine to that tranny, and bolt the engine down where is lands.
It is THAT sinple.
On a 2 wheel drive, it won't be correct, but it'll be fine. Get a fan shroud for a small block 4X4.
On a 4X4, it'll be correct as if it had a small block from day one.

Re: Inline 6 to V8 swap w/ 4 speed
 

"On a 2 wheel drive, it won't be correct, but it'll be fine. Get a fan shroud for a small block 4X4.
On a 4X4, it'll be correct as if it had a small block from day one."
Longhorn Man is correct on 4x4 I6 or V8 use same mounts. The engine looks like it is sitting to far back but it is correct although their is no room for an HEI dist.
On a 2wd a I6 is mounted in the rear position just like the 4x4, but the V8 is mounted 3" forward. This is done by simply switching the frame mounts left-right and right-left and then mounting them in the front holes in the frame. I have done this swap before it is very simple. The swap I did was with a TH350 trans so I just replaced the short tailshaft with a long tailshaft trans from a 73 and newer truck which made up for the 3" differance so I could use the original driveshaft. Also the 292 does have a special right mount all to its own.

Re: Inline 6 to V8 swap w/ 4 speed
 

Flywheel should be the same, can reuse that if wanted. You don't want to move the tranny, so use the 6 cylinder frame mounts bolted where they are, change the right one to a 250 mount. Drops right in. If you have good cab mounts, HEI will fit, but it will be tight.

Re: Inline 6 to V8 swap w/ 4 speed
 

what about an MSD distributer fit?

Sorry to hi-jack the thread.

Re: Inline 6 to V8 swap w/ 4 speed
 

will the oil-pan be a problem with the front axle?

Re: Inline 6 to V8 swap w/ 4 speed
 

Sorry to bring back an old thread but it seems like everyone in this thread knows what they are talking about. I am swapping a 250 inline 6 out of my 78 GMC K-15 for a 350 out of a 78 Chevrolet C-30. I have already got the 250 out and the 350 in the frame. But the frame mounts don't seem to line up with the bolt holes in the 350 mounts. It is driving me slowly insane. Any input would be appreciated.

Re: Inline 6 to V8 swap w/ 4 speed
 

I'm not sure if I am understand what the issue is, but the engine mounts bolt to the engine mount crossmember in a slightly different location between the I6 and V8. At least they do in the C series trucks. There are the numbers 6 and 8 stamped close to the appropriate holes.

Re: Inline 6 to V8 swap w/ 4 speed
 

My K15 cross member mounts only have one set of holes but the measurements match up to the set the old mounts were using on the C30, I assume the other set were for BBC motors. If I used the original motor mounts that were in the C30 the motor mounts almost perfectly but if I use the new ones I picked up for this install passenger side matches but the driver side is 2 inches from fitting.

Re: Inline 6 to V8 swap w/ 4 speed
 

Assuming the new engine mounts are correct, sometimes it helps to leave them a little loose until you get the engine in position and dropped down into the new mounts. This is the difference between old mounts that have have been hammered on for years versus new mounts that haven't been compressed and sit up a little higher.

Re: Inline 6 to V8 swap w/ 4 speed
 

Well the passenger side I've barely got the nuts threaded onto the bolts for more movement to get the other side in place. I guess I just need to mess around with it some more till I finally get it to fall in to place. I just figured maybe there was something I wasn't doing right maybe do driver side first or something but both mounts are the same and identical to the old ones just not destroyed from years of hard work.