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Re: B/ RB cam tunnel issues on proper sizes
[Re: ZIPPY]
#2731220
01/08/20 07:44 PM
01/08/20 07:44 PM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,678
Stuttgart, Arkansas
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Bearing scraper and scotchbrite pads for me.
That's my way too. And if you fit them one at a time you don't have to scrape that much. I do have one of those cheater tools as John pictured but I think it might remove more material than I want to take out.
2011 Drag Pak Challenger
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Re: B/ RB cam tunnel issues on proper sizes
[Re: Cab_Burge]
#2731350
01/09/20 09:43 AM
01/09/20 09:43 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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master
Joined: Jun 2008
Posts: 3,916
usa
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The cam I was using to test fit the cam bearings had one tighter spot on each revolution, it was not the same tightness all the way around on each revolution. I'm going to check it for run out before using it in a motor, it is a steel black coated solid roller cam that I was using for mock up only on this 440 block pump gas stroker motor I have 5 or 6 solid roller cams in the cam cupboard and this one was the one I grabbed it would be nice if you have a small dial bore gauge to check the block journal i'd.'s. there may be something goofy there.
Last edited by lewtot184; 01/09/20 09:44 AM.
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Re: B/ RB cam tunnel issues on proper sizes
[Re: lewtot184]
#2731361
01/09/20 10:33 AM
01/09/20 10:33 AM
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Joined: Mar 2011
Posts: 3,093 Michigan
A727Tflite
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master
Joined: Mar 2011
Posts: 3,093
Michigan
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The design stack up takes in to account all the vairiables mentioned here - block, cam bearing, journal size variations along with camshaft runout. Blueprints were developed with the min/max sizes and runout.
Testing was then performed using these specs.
Production then built the parts within those specs. At least they tried to.
Mass production, tool life, lack of process control, lazy maintenance play into variations in specs. We have all seen it - blocks differing in deck heights, bore sizes, etc.
Even though developed in the late 50’s, the design is obviously robust enough as we have been using these blocks with conventional bearings with high lift cams and spring pressures probably three times more than designed for.
I have seen it many times - product engineering says “build this” then the plant floor says “we can’t with these specs” then things get loosened up.
Tooling and matching has changed tremendously since then.
Today the engine plant can machine and build an engine that rivals hand built/blueprinted engines from the 60’ and 70’s. Day after day.
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