Thinking about swapping a 250 into my 59 apache, currently has 261. I have the proper bell housing and know that I will need a aftermarket engine mount for the center mounts. I do know the ignition switch and starter will have to be changed and surely some other minor issues will pop up. Anyone ever done this swap and have some info? I could put a small block in it, but would rather the 6 cylinder. Anyone have any input? Thanks.
Why take a giant leap backwards in performance from the 261? The 250 will fit the V8 front motor mount position for the 59 frame- - - -just use the OEM V8 bellhousing and starter for the conversion. You're going to miss the torque of the 261 since the 250 is designed for higher RPM operation and has a shorter stroke. Swapping to a 292 instead of a 250 would take about the same amount of effort, and that would make a lot more sense. Jerry
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The only skinny block six I've done is a 292 into a 57 1/2T. I allowed one day to mount the engine in place and hook up everything but the exhaust---big mistake because it's not a quickie swap. Have done one other old six to new six in a TF but it was the much superior 300 Ford into a 56 GMC. The owner of the GMC will have to die before he parts with his truck. One other footnote; neither one can pass a gas station.
Jerry and Evan, Thanks for the comments, life got in the way this passed week so I haven't been here. The 261 has been in the truck and on the road for 10 yrs. I'm kind of tired of it, travel a lot on the highway and the 250 would be more highway friendly. I have an 82 chevy 1/2tn for a donor it is rusty and the 250 runs like a top only has 85,000 original miles. I don't have a 292 handy. The 250 is a couple hundred lbs. less in weight than the 261 also. Was just a passing thought as I will be removing it and getting rid of the 82 rust bucket. I have the bell housing for a small block to mount in the 59 so I could go with a small block easy. Just wondering if anyone had done a 250 in a task force truck and could comment on it.
I just put a 68 camaro 250 into my 59 GMC 100. I fabricated an engine stand mount that uses the 68 camaro motor mounts and also fabricated a crossmember mount for the rear trans mount. Being it is a GMc and I replaced a 270 I had ample room to move the engine forward or backwards. I could have used any v8 auto trans but I elected to keep the clutch and floor pedals. I was fortunate that my placement of the engine and trans allowed me to reuse the driveshaft even after replacing the dana spicer 45 (3.07) with a 67 12 bolt rear (3.73). I will post some pics.
Being the 270 had a taller deck required making sure my 250 fan blades were in near correct position on the radiator. You may not have this issue. I do recommend changing the valve seals in your 250 unless newly rebuilt.
Last edited by 42465967; Fri Dec 20 2019 07:26 PM. Reason: words
Thanks for responding. Your pictures are interesting, the center mount looks like 2"square tubing? The ends maybe cut in half and that would rest on the bottom frame rail? Would you happen to know the dimension of the thru bolt on the frame and motor mount? From side to side maybe 15-18 inches? What starter will you be using the one that bolt to the block or the bell housing mount? Looks like a Doug Nash 4+3 transmission that should work well with the rear.
I have a Borg Warner world class T5 in mine with a 3.90 rear, the fifth gear makes a world of difference.
Yes on 2" and I welded a flat on the bottom of the cuts that rest on the bottom frame rail.. I used block mount starter with a 153 flywheel lopping off a bolt mount on the cast iron truck bell housing. Bolts I used are 2" grade 8 with flat and lock washers.
An after market tubular or such will work but I like free or near free if I can. I used a trans crossmember from a 75 4wd, a 2wd square body will work maybe with modification. The one in your donor would be a start. Use all from donor you can.
I kept everything high so the 4+3 competition plus shifter would only require a small as hole in trans cover as I could.
If you are retaining your trans then a sbc cast iron bellhousing with side mounts might be used with mods unless you are using a 168 tooth flywheel for bell housing mount starter.
If you are going to use the 250 block mount starter then it would need to be a 153 tooth flywheel --use everything from your donor and determine from there. You can use a cast iron bell housing - bell housing starter mount --- with a 250 block mount starter 153 tooth flywheel if you lop off the remotess bolt hole on the bell housing. You may not need to consider this at all.
If your 82 and 59 are both sticks you may have all you need.
Last edited by 42465967; Sun Dec 22 2019 12:18 AM. Reason: words