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261 Rebuild questions #1311508
Wed May 22 2019 03:22 PM
Wed May 22 2019 03:22 PM
B
bigblack'74  Offline OP
Wrench Fetcher
Joined: Nov 2013
Posts: 37
iowa
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
Wed May 22 2019 05:48 PM
W
wolffcub  Offline
Shop Shark
Joined: Sep 2014
Posts: 388
Edmonton Alberta


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
Wed May 22 2019 06:17 PM
S
sstock  Offline
Shop Shark
Joined: Jan 2013
Posts: 1,247
Gig Harbor, WA

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

Re: 261 Rebuild questions [Re: bigblack'74] #1311521
Wed May 22 2019 06:21 PM
Wed May 22 2019 06:21 PM
F
Fox  Offline
Shop Shark
Joined: Apr 2002
Posts: 1,413
Breton, Alberta
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.



In the Stovebolt Gallery
More pictures here

1953 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- rusted
1970 Chevrolet K20 Suburban—rusted.
1950 Chevrolet 1300- in progress to shiny.

Parts trucks-
1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
Re: 261 Rebuild questions [Re: bigblack'74] #1311532
Wed May 22 2019 08:37 PM
Wed May 22 2019 08:37 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,595
Dellrose, TN
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
Wed May 22 2019 11:17 PM
D
drdoug  Offline
Shop Shark
Joined: Aug 2018
Posts: 121
Prosper, TX
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
Wed May 22 2019 11:22 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,953
Jarvisburg, NC
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 50 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
Thu May 23 2019 07:39 AM
Woogeroo  Offline
Socket Breaker
Joined: Feb 2002
Posts: 2,903
Tool Box
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
Thu May 23 2019 01:24 PM
S
sstock  Offline
Shop Shark
Joined: Jan 2013
Posts: 1,247
Gig Harbor, WA
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

Re: 261 Rebuild questions [Re: bigblack'74] #1311648
Thu May 23 2019 02:38 PM
Thu May 23 2019 02:38 PM
V
Volfandt  Offline
Shop Shark
Joined: Aug 2012
Posts: 1,656
Knox County, TN
Woogeroo, if there was a like button I'd apply it to your post.

Carry on
Dave

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Moderated by  53moneypit, Woogeroo 

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