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261 Rebuild questions #1311508 Wed May 22 2019 03:22 PM
Joined: Nov 2013
Posts: 43
B
bigblack'74 Offline OP
Wrench Fetcher
I have several questions as I begin a 261 Rebuild.

Are there .070 pistons still available?
We are on .060 bore and it's not great looking and am not sure we can get away with a hone job.

What is max safe milling on head and block WITHOUT modification to pistons to clear valves?

I assume we use all our clutch and bell housing from the 235 in the car now? Can I use a larger clutch inside stock 1953 235 car bell housing?

Thanks


1953 Chevrolet Handyman Wagon 36k
1938 Buick 38k
1947 Hudson Commodore 18k
Re: 261 Rebuild questions [Re: bigblack'74] #1311517 Wed May 22 2019 05:48 PM
Joined: Sep 2014
Posts: 388
W
wolffcub Offline
Shop Shark


I myself have not seen 0.070 pistons but could be wrong. Going to .080 might be the only way.


Re: 261 Rebuild questions [Re: bigblack'74] #1311520 Wed May 22 2019 06:17 PM
Joined: Jan 2013
Posts: 1,519
S
sstock Online
Shop Shark

To the bigblack, dont be driven off so fast, your 261 needs the cylinders sonic tested to see if you can over bore it that far. That is if you can even find .080 pistons, I know .030 and .060 are available for the stock 3.75 bore. Im in the middle of my 261 rebuild now. You might need six sleeves, then open your wallet for that one.

Maybe Pre68 Dave will chime in, or machinist Jerry

Steve


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 261 Rebuild questions [Re: bigblack'74] #1311521 Wed May 22 2019 06:21 PM
Joined: Apr 2002
Posts: 1,534
F
Fox Offline
Shop Shark
I’ve always been told that .060 is a usable limit. The walls aren’t too thin and reliability is still there. If you do a search I bet you’ll find more to read. I have 0.060 pistons in my 261 and it runs very well.


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1951 GMC 9430 1 ton dually—-Shiny!

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1950 Chevrolet 1300- in progress to shiny.

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1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
Re: 261 Rebuild questions [Re: bigblack'74] #1311532 Wed May 22 2019 08:37 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
If the OP is still monitoring this post (I hope so) drop me a PM. I've got a few constructive suggestions.
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: 261 Rebuild questions [Re: bigblack'74] #1311550 Wed May 22 2019 11:17 PM
Joined: Aug 2018
Posts: 181
D
drdoug Offline
Shop Shark
Assuming the question of 261 overbore is still of interest... Egge lists 0.080" and 0.100" oversize # L2033-6 pistons as available. Agree that sonic testing would be a good thing before going that far, as Steve suggested. Egge isn't cheap, but probably cheaper than 6 sleeves, if the block is good for the overbore, I guess.

Re: 261 Rebuild questions [Re: bigblack'74] #1311551 Wed May 22 2019 11:22 PM
Joined: Sep 2001
Posts: 28,883
tclederman Online
Boltergeist
Thanks, drdoug,

It would be nice to hear from members that have a 261 with 0.080"/0.100" overbore/oversize.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: 261 Rebuild questions [Re: bigblack'74] #1311600 Thu May 23 2019 07:39 AM
Joined: Feb 2002
Posts: 2,921
Woogeroo Offline
Socket Breaker
Hi. O.K. I cleaned out the stalls here of the fresh manure, dunno what all that was about.


To clarify a few things though:

The founders/owners/editors of Stovebolt.com have always allowed discussion of the bits and pieces that are shared between the trucks and cars that fall into the pre-1973 category. Things like the engines, transmissions, axles... the drivetrain basically... maybe the heater assembly or the electrical system.

They are aware that some Chevy/GMC truck folks have old GM cars as well and would like to ask their stovebolt buddies about their engines or what not. As long as the post is about the bits and pieces and placed in the appropriate forum and it is disclosed it is about a car or wagon whatever, there is no issue.

Now, if someone started a whole thread about their non truck project, that would probably get the ax.

The original poster did nothing wrong asking for information about their 261 engine which clearly falls within the purview of the 'bolt and more specifically here within the engine shop.

Please help them out with any information you may be able to share.

Carry on and happy wrenching.

-Woogeroo / The Engine Shop moderator


Re: 261 Rebuild questions [Re: bigblack'74] #1311624 Thu May 23 2019 01:24 PM
Joined: Jan 2013
Posts: 1,519
S
sstock Online
Shop Shark
Bigblack, check this out if you haven't already, there is a segment on cylinder bore taper too, a good read.

https://www.stovebolt.com/techtips/engines/261%20rebuild/index.html


Steve


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 261 Rebuild questions [Re: bigblack'74] #1311648 Thu May 23 2019 02:38 PM
Joined: Aug 2012
Posts: 1,742
V
Volfandt Offline
Shop Shark
Woogeroo, if there was a like button I'd apply it to your post.

Carry on
Dave

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