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Re: 1 Ton GMC 248 to 302 swap [Re: TrustyOldIron] #1297264 Sat Feb 02 2019 02:16 PM
Joined: Jun 2001
Posts: 692
T
TrknGMC Offline
Bondo Artiste
A military 302 can be converted to fit in your truck, but its not a easy conversion in my opinion. A civilian 302 is almost a direct sway depending on what year range you go with. A 270 or 302 would be a great upgrade to your truck, along with the 4:10 rear. The 4:10 rear change will be a quicker upgrade than changing engines. I would start there and then see how you like the truck and then if you need some more power then start looking for a good 270 or 302 to drop in.

On a another note....

"248, etc., pans will not fit 270's, etc., because of the longer trove."

I used my 228 oil pan on a 270 swap back in 2008, on my previous 52 GMC half ton without any issues. My 45 GMC has a civilian 302 in it right now with a 228 oil pan, again no issues. Not sure where your info is coming from but I've made it work without any alterations.

Yes, there are different oil pans between the 228, 248, 270, and 302 engines. but from I understand the differences have to do with oil capacity, not a "fitment" issue between the blocks.


Phillip
1927 Chevy Capital 1 Ton truck - basket case
1941 Chevy Suburban - Parts only
1949 GMC Suburban - 10 year project
1945 GMC half ton truck - Driver
1946 Chevy COE - Might restore one day...

https://photos.google.com/u/1/albums
Re: 1 Ton GMC 248 to 302 swap [Re: TrknGMC] #1297279 Sat Feb 02 2019 05:12 PM
Joined: May 2006
Posts: 601
T
tom moore Offline
Shop Shark
That was my understanding regarding the oil pans as long as the oil pump was compatible with the depth of the pan. I’m certainly no expert on this subject but I did a lengthy search with others before I converted the military 302 to civilian use.

Last edited by tom moore; Mon Feb 25 2019 01:09 PM.
Re: 1 Ton GMC 248 to 302 swap [Re: EdPruss] #1298220 Sat Feb 09 2019 07:28 PM
Joined: Mar 2005
Posts: 174
B
bluechev Offline
Shop Shark
Originally Posted by EdPruss
248, etc., pans will not fit 270's, etc., because of the longer throw.

Ed

My 302 has a 228 pan on it it offers no interference with crank/rods whatsoever.


Robert French MY3800FIRETRUCK
Re: 1 Ton GMC 248 to 302 swap [Re: EdPruss] #1308503 Thu Apr 25 2019 05:40 AM
Joined: Mar 2005
Posts: 174
B
bluechev Offline
Shop Shark
Originally Posted by EdPruss
248, etc., pans will not fit 270's, etc., because of the longer throw.

Ed

I’ve got a 228 pickup oil pan on my 302. Fits just fine just needs the corresponding pickup tube on the oil pump. No interference with crank/rods whatsoever.


Robert French MY3800FIRETRUCK
Re: 1 Ton GMC 248 to 302 swap [Re: TrustyOldIron] #1311991 Sun May 26 2019 01:57 PM
Joined: Jun 2003
Posts: 508
J
jmoore Offline
Shop Shark
"removed the exhaust riser butterfly"

This may be causing you some performance issues.


"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150
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