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#1
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Cam locking plate bad or what?
Installed my cam and bolted up the locking plate, torqued to specs but it looks warped or something. I expected it to be flush against the block, it didn't seem warped before I put it on. The cam was pretty difficult to install, did not want to slide in easily, Should it be pushed back as far as it will go? Afraid to continue with the assembly with it like this, advice anyone?
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#2
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Rear of cam hitting cam plug on back of block
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
#3
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Thanks Richie for the quick reply! I'll look at that.
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#4
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OK pulled the plate off, it is off a bit not quite flat. I was able to shift the cam back into the block a bit more. The edge of the lobes are not centered with the lifter bores and the cam looks a little "counter sunk" into the block. Is this correct? Sorry for the stupid questions but I want to make sure I'm not screwing anything up, I have no desire to repeat this rebuild process.
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#5
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Lobes are designed to be offset.Tom
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#6
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So this is correct? Sorry I've not done this is a very long time and don't remember much. Was thinking the lobes needed to match the lifter bores.
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#7
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From the info provided:
The cam will run flush to the front of the block, lifter bore alignment should be better and likely fine then. Does the cam turn easily? If not: You likely have a problem with the cam bearings. You will need a new thrust plate also. Find and fix the cam bearing issue before installing the new plate. HTH |
#8
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Easy to bend the cam retainer plate if the cam was hanging up on the cam bearings or the rear cam core plug was too far forward, as mentioned in other posts.
If you bent the cam retainer plate, it is better to just buy a new one. All parts of the system need to move freely and checks made at each step for proper installation. "Throw it together" is a bad way to learn, unless you are wealthy IMO. Even then, sometimes better to just have a PRO like Richie or the Butlers do it for you. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#9
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The dist will push the cam forward,if that far back there is no issue with the rear soft plug.Get a new plate,make sure you can turn the cam over without a big effort and you should be good to go.Tom
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#10
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Quote:
MAKE SURE the cam snout is sticking through the cam gear for the fuel pump eccentric to fit/center on. Once you tighten the bolt..check your end play. Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
#11
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Quote:
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#12
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Thanks for all the great info everyone. I will check with my machine shop on the cam tightness issue. I did coat the cam mains with Comp Cams lube before installing. That stuff is pretty sticky, maybe that is causing the issue. Should I have used motor oil instead?
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#13
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Oil on the cam journals only, cam assembly lube on the lobes.
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#14
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Quote:
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#15
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Thanks again guys, sure am glad I asked and that this section is "No question too basic here!" I'm sure I will have a few more before I have this thing together.
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#16
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Which lube is that
Quote:
What lube you talking about that can stop-up or restrict oil flow? I ONLY use Sealed Power Cam and Assembly Lube for cam swaps, rebuilds/refresh, new builds, etc.. I use it to lube nearly every moving part but rings. I've also used it as an additive on oil changes. A thin film is all it takes with it. A thin film is all that's left on parts once they're installed. Nothing thick or gobbed up dripping/hanging off the parts. https://www.summitracing.com/parts/slp-55-400/overview/ So would just like to know what not to try or reccomend if it will plug oil passages up. Clay
__________________
All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
#17
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I have mentioned this before. On my last .030 455 build the cam was just real hard to install. It wouldn't get pasted the 2nd cam bearing. I bought new cam bearings and installed them and the same problem was present. The block was baked and peened to clean it. I took a brake cylinder hone and a lot to WD-40 and honed the cam bores and found out the bores were upset on the edges. I honed until the edges we almost even with middle of the bore. I could tell because the edges were shinny. I douched it out real good and reinstalled the 3rd set of bearings and the cam went in easily. I told the machinist about this and he said "never happened before".
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1979 Trans Am WS-6 .030 455 zero decked flat pistons 96 heads with SS valves 041 cam with Rhoads lifters 1.65 rockers RPM rods 800 Cliffs Q Jet on Holley Street Dominator ST-10 4 speed (3.42 first) w 2.73 rear gear __________________________________________________ _______________________________ 469th TFS Korat Thailand 1968-69 F-4E Muzzle 2 |
#18
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The cam should not be hard to move in. When I did the install on mine, with just oil on the cam journals, you could literally push the thing through with your pinky and even then you had to watch how much pressure you gave it.
It should slide and spin freely. If it doesn't, definitely find out why and have it corrected. As others have mentioned, I would buy a new cam plate now that it's warped. Some of the cam plates for sale are not necessarily the correct thichness however, so you may want to look in to that. The one I purchased ended up .08 to thin and left my end-play at .015 as a result. For a flat tappet cam this probably isn't an issue, but if you're running a roller, it may be. I believe Tin Indian Performance sells cam plates that are the correct thickness.
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-Jason 1969 Pontiac Firebird |
#19
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X 2. A new cam retaining plate should be installed with a new cam.
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#20
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Quote:
__________________
“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
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