And to make it worse, most FT's didn't use the side mounts anyway

 

Ok got curious about this so went out and checked my spare blocks, the 67 block that came out of the galaxie has 3 bolt mounts. Both of the truck blocks (1 360 out of a 74 F150, and a 390 out of I think a 72 but not 100% sure on that) have 2 bolt mounts BUT when you take the mount of you find the block has the provision for the 3 bolt mount SO even though the application uses a 2 bolt mount the block is interchangable.

 

I just checked. I have a 69 and 2 71 pickups. All have 2 bolt mounts. The f600 down the road with a 361 has 3 bolt mounts.

 

My 66' with 352/Cruiso has the same mount shown in the post

 

Like I noted in post #17 it might have the 2 bolt mount but the block may be setup to use the 3 bolt too. that was what I found on the blocks I have in the shed even though they have the 2 bolts on them if you remove the mount you can see the hole to put the other style on.

 

The changeover was '65, but the newer blocks don't have 3 bolt holes, they have 4. the 2 new holes are farther back, and wider spaced- the originals are close-spaced, adjacent to the freeze plug. I've never seen all 4 used at the same time, usually 2, sometimes 3. The mount pictured is indeed a later pickup mount, not an early Galaxie mount, and uses the wide-spaced holes- although there was a flat early Gal mount that somewhat resembles it, using the narrow-spaced holes, and the holes are offset to one side- just went out and looked at an original '63 390 out of a Gal in the shop that still has the mounts on it. There were actually two completely different early Gal mounts, with different perches on the crossmember- the flat one, used with a tall perch, and the thicker C-shaped one, used with a short perch- like on my '62 406 car. I used those (pictured) mounts to put the '64 427 in my early '77 F250 highrider, changed the perches from the 351M ones to FE, and made a flat-stock adapter plate that bolted to the two narrow holes on the block, and the two wide holes on the mount. I also have an oddball 427 block, a C5AE-A, a new for '65 casting that's a pre-side oiler, but has the 4 mounting holes. I don't believe the 4-bolt pattern had much to do with strength for "trucks", as was said, FT's usually mount front & bell, and if you call pickups "trucks", well, 406's, early low risers, and high risers all had 2-bolt narrow-pattern blocks, would have been stressed a lot more than Gramp's F250, and I've never heard of an FE block breaking at the mount bosses- although the newer setup would definitely be stronger

 

MeanGene427 - I am glad to see your post. I had my 360 original engine out of my 69 F100 recently and replaced it with a 67 410. Both had 4 engine mount holes, and only two were used. The mounts from the truck looked just like those on this thread.

 

ok, been reading the treads and had to go and look. Im working on my nephews 72 f-250 4x4, it had a 360 in it, i am rebuilding a 67 t-bird 390 for the truck. the blocks do have diffrent # of bolt holes, will i beable to put the 390 in his truck by just swapping out the mounts. Just got it back from the machine shop so i hope so. thanks giovanni

 

ok took a better look this morning the t bird block has 2 mounting bolt system on the block while the 360 has 4 bolt holes, the motor mounts off the 360 for the 72 truck dont match up with the tbird block, is there a new mount i have to buy. thanks gio