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Canadian Poncho Homepage -> Canadian Poncho -> Pre 1958 Canadian Pontiac Power Train Tech Forum -> 261 Inline Six motor question on camshafts.
Post Info TOPIC: 261 Inline Six motor question on camshafts.
long stroke


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261 Inline Six motor question on camshafts.
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I have a 1957 Pontiac with a 1960 261 inline six cylinder motor. I am looking to change the camshaft and lifters in my motor from hydraulic to solids. The reason is that there are no quality hydraulic cams and lifters being produced today. I can easily purchase a new solid lifter camshaft and matching solid lifters for this 261 but i have a question about the cam journal size. The cams are available in two different cam journal sizes. The large journal cam is 2.153 in size and the small journal cam is 2.030 in size. I have no idea what this 261 motor is. Does anyone out there know what the cam journal size is for my 1960 261 inline six motor. I am just changing the cam, lifters and push rods at this time. The rest of the motor is fine. I can order the camshaft and lifters from the U.S. but i am not sure which journal size i have. Any help would be greatly appreciated. Al Taylor, sir would you know. Many thanks ahead of time for any help. Cheers. George.



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1957 Pontiac Pathfinder Deluxe sedan restored 261 six

1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8
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I am still wondering if anyone knows the cam journal size for a 261 inline six cylinder of my vintage. I was hoping to order a cam soon. Thanks. George.



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1957 Pontiac Pathfinder Deluxe sedan restored 261 six

1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8
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Beaumont4008


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What !! No answer to this yet.  Did you ever order a cam yet. I looked in an old Isky cam book an it shows no reference to any cam journal difference. Just shows the same part numbers for all the years. Some one on here should know this. You might just have to take your cam out and measure before ordering.

 

Ian



-- Edited by Beaumont4008 on Monday 17th of November 2014 12:50:01 PM

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CdnGMfan


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George! Try visiting the Stovebolt Engine Co website and see what they suggest. Link: http://www.langdonsstovebolt.com Tom Langdon can be a bit of a grumpy guy but he is very knowledgeable and trustworthy. He was an engineer for the thinwall 194-215-230-250-292 sixes, but he is a vendor for inline six hop-up parts for many makes and generations.

You could also check http://www.inliners.org

 

You know, there have been many bad lifters made in the last little while that can be considered partially to blame for camshaft failures. I know there was a thread over at Team Chevelle in which numerous experienced builders weighed in on the situation and which brand of lifters to use. Sometimes it isn't the lifter, it is the clearance in the lifter bore.

I say try to keep the hydraulic lifters and cam in that beast, that way you can run up and bump people in the back of the legs because it will purr so quietly.  



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67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

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GLHS60


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As far as I know, all cam bearing journals were the same size from 1955-1962, 235-261, @ 2.153".
Cam bearings have the same part # 1170 M
I have run solid lifters on hydraulic cams many times on ticking stovebolts in my younger years.

Thanks
Randy



-- Edited by GLHS60 on Monday 17th of November 2014 04:46:42 PM

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