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1954 gmc 100 deluxe 5 window truck with 248 engine
#1392891 Sat Jan 16 2021 04:23 PM
Joined: Jan 2021
Posts: 4
G
Moderated
Hello to all. I am a new member to stovebolt and am looking for .060 pistons flat top for my gmc 248 engine. I have had 2 engines with cracked blocks and finally found a good block which had to be bored .06 over. I've been searching for pistons without any luck locating any. Egge pistons will not run a set until June sometime. What are my options? Could I use a 270 or 302 engine short block with all my engine components, cyl head, exhaust manifold, generator, starter, distributor, water pump, fuel pump, transmission and motor mounts, etc......? My new bore size is 3.778" with .990 wrist pins.

Thank you in advance
Gabeo

Welcome, please read the forum rules. References to parts wanted and parts for sale are not allowed in the garage forums. Such requests belong in the Swap Meet Forums. Thank you

Last edited by Justhorsenround; Sat Jan 16 2021 04:52 PM. Reason: Removed parts wanted and parts for sale.

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Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1392899 Sat Jan 16 2021 05:17 PM
Joined: Sep 2001
Posts: 30,933
Boltergeist
Welcome to Stovebolt.com, Gabeo/gabriele

You might want to also join and post a Want Ad at oldGMCtrucks.com discussion board [oldgmctrucks.infopop.cc]?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1392927 Sat Jan 16 2021 08:33 PM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
You could install 3/32" wall sleeves in the cylinders and re-use your standard bore pistons. The cost of the sleeves and the machining will probably be less than what Egge will charge for new pistons. Their prices are higher than the reproductive system on a tall giraffe!

Edit: I don't know of any reputable machinist that will bore an engine before having the replacement pistons on hand. You might want to consider doing the sleeve job and boring/honing the cylinders to the correct skirt clearance for your original pistons, but choose a better-qualified machinist to do that job for you.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1393055 Sun Jan 17 2021 03:46 PM
Joined: Jan 2021
Posts: 4
G
Moderated
Thank you all for the reply, but it would cost me $1500 to sleeve and bore on the existing block. I've already installed the crank, cam, and front gear cover on the block. I would rather wait to find pistons to continue the build. Is there someone out there that may have them?

please visit the Swap Meet here on the Stovebolt page for your parts wanted/for sale inquiries.


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Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1393752 Fri Jan 22 2021 03:53 PM
Joined: Jan 2021
Posts: 4
G
Moderated
hello; everyone. I
m still looking for .06 over pistons for my 1954 248 engine. Any help would be appreciated.


😊
Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1393928 Sat Jan 23 2021 08:01 PM
Joined: Jan 2008
Posts: 4,698
C
Shop Shark
The 248 with flat pistons was a very short production engine. They were used in 54 and 55 and then discontinued. Finding any kind of pistons for a 248 is going to be a challenge. I could cut my losses and find a 270 or 302 block for which parts are available or find 248 with pistons in it that will work with just honing the cylinders. I am 77 years old and we had GMC's in our business when they were still current production. Installing salvage liners like Jerry suggests will make your engine like new. But even standard pistons are hard to find. We installed salvage liners almost 60 years ago, but if more than one cylinder needed one, be bought a new short block because they were still available then. Even if you find .060 pistons I would have the cylinder walls sonic tested. I would never bore an almost 70 year old engine .060 becaue you don't know how much corrosion you have from the water jacket. Salvage liners like Jerry suggests would fix this.

Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1393930 Sat Jan 23 2021 08:06 PM
Joined: Aug 2001
Posts: 1,213
G
Shop Shark
Have you considered checking with one of the piston companies such as Ross to price a custom piston? Last I heard, that option was around $600 foe a set. Just a thought if you are intent on saving original block.

Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1394043 Sun Jan 24 2021 04:27 PM
Joined: Feb 2020
Posts: 15
G
New Guy
Ive had some luck in the past with summit racing. MAH-S2243887.


51 GMC 100 with 59 chevy 261 under the hood.
3 on the floor with 4.11 gear.
Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1394089 Sun Jan 24 2021 08:00 PM
Joined: Apr 2020
Posts: 30
T
Professional procrastinator
Originally Posted by gabriele
hello; everyone. I
m still looking for .06 over pistons for my 1954 248 engine. Any help would be appreciated.

I may have what you are looking for. I have taken apart a couple 248's and kept all the parts. I will check my stash in the next day or two. Odds are long that they are the .060 you want but stranger things have happened.

Re: 1954 gmc 100 deluxe 5 window truck with 248 engine
gabriele #1394177 Mon Jan 25 2021 03:49 AM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
What is the compression height on a 248 piston? (center of the wrist pin to the top of the piston)
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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