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Cam thrust plate - Which one?

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Old Aug 12, 2022 | 12:56 PM
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Default Cam thrust plate - Which one?

2000 C5 Corvette M6 stock LS1 + headers

https://www.rockauto.com/en/catalog/...st+plate,10606

Some have recessed bolts some not, I wanted to go with the Fel-pro because of the 3-rib design, but not sure if recessed bolts pose a problem. Is this okay?
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Old Aug 12, 2022 | 06:50 PM
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Factory uses recessed bolts.
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Old Aug 12, 2022 | 09:39 PM
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Originally Posted by dixiebandit69
Factory uses recessed bolts.
Thank you so much!!
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Old Aug 12, 2022 | 10:10 PM
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well....they use the countersunk bolts ...now....the old style were regular bolts....either is fine....i prefer not to bugger up any torx bolts myself and use regular bolts
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Old Aug 12, 2022 | 11:05 PM
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Originally Posted by sjsingle1
well....they use the countersunk bolts ...now....the old style were regular bolts....either is fine....i prefer not to bugger up any torx bolts myself and use regular bolts
This.
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Old Aug 13, 2022 | 03:09 PM
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and gotta make sure you know.....dont use regular bolts in countersunk holes....have to use the old style plate....NLA from GM but aftermarket has plenty
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Old Aug 15, 2022 | 09:05 AM
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Another tip. Most times you remove stubborn bolts with heat, you heat the material around the threads. I once broke an Allen wrench in a retainer plate flat head screw!! I didn't want to try heating all that aluminum around the screw threads, so I put the flame right on the screw head. You're basically trying to liquefy the loctite in the threads. It only takes about 6-10 seconds, and it will come right out. BTW, in my apprenticeship, and also from journeyman Tool and Diemakers, we were taught not to use any threadlocker on countersunk holes/flathead screws. Maybe thats why I broke my wrench!!! Still, I can't recommend foregoing loctite in this application, it's just extra insurance. Hope this helps.......

Last edited by grinder11; Aug 15, 2022 at 10:56 AM.
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Old Aug 15, 2022 | 02:59 PM
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Originally Posted by sjsingle1
and gotta make sure you know.....dont use regular bolts in countersunk holes....have to use the old style plate....NLA from GM but aftermarket has plenty

So if I need to use the Trick Flow dampener adapter(not sure if my block is drilled for it yet) I would probably want to use the flat, non-countersunk plate?
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Old Aug 16, 2022 | 02:28 AM
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Amazon has the mahle ls1 thrust plate or cam retainer plate new for 13$-15$. I bought one for my 99 corvette ls1 cam swap. Brand new factory style plate with the flat bolt heads not the new style countersunk i had a countersunk plate one time and seemed like it would crack at the beveled part of the plate bolt surface area.
This is the flat style prior to 06
Amazon.com: MAHLE B31822 Gasket : Automotive Amazon.com: MAHLE B31822 Gasket : Automotive
worked great for my 99 cam swap its currently 18$ was 15$ when i bought one and went down to 13$ right after on amazon summit has it for 15$.
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Old Aug 16, 2022 | 09:30 AM
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Originally Posted by 95maroz28
Amazon has the mahle ls1 thrust plate or cam retainer plate new for 13$-15$. I bought one for my 99 corvette ls1 cam swap. Brand new factory style plate with the flat bolt heads not the new style countersunk i had a countersunk plate one time and seemed like it would crack at the beveled part of the plate bolt surface area.
This is the flat style prior to 06 Amazon.com: MAHLE B31822 Gasket : Automotive worked great for my 99 cam swap its currently 18$ was 15$ when i bought one and went down to 13$ right after on amazon summit has it for 15$.
Kurt Urban, renowned engine builder now at Scoggin Dickey, once told me that he had seen the newer style flat head screw/countersunk type plate crack occasionally when torqued to spec. He recommended going a few ft/lbs shy of the torque spec, and using blue loctite on the screws.
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Old Aug 16, 2022 | 04:28 PM
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Originally Posted by Kagnu
So if I need to use the Trick Flow dampener adapter(not sure if my block is drilled for it yet) I would probably want to use the flat, non-countersunk plate?
I have never used the trick flow piece ....so not a clue which plate it requires
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Old Aug 18, 2022 | 10:37 AM
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Originally Posted by Kagnu
So if I need to use the Trick Flow dampener adapter(not sure if my block is drilled for it yet) I would probably want to use the flat, non-countersunk plate?
That is what i did on my 5.3.
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Old Jan 1, 2023 | 10:33 PM
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do you need to replace the gasket whenever you change cams, if so do they make just the rubber piece, or do you need the whole plate too?
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Old Jan 2, 2023 | 01:35 AM
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Originally Posted by wormw00d
do you need to replace the gasket whenever you change cams, if so do they make just the rubber piece, or do you need the whole plate too?
Replace the plate. $9 from my local engine parts warehouse.
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Old Jan 2, 2023 | 10:34 AM
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Originally Posted by n2xlr8n66
Replace the plate. $9 from my local engine parts warehouse.
^^^^^^THIS^^^^^^
Too cheap to keep the old one, besides which, they do wear out.
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Old Nov 19, 2023 | 05:38 PM
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Question: Is there a clearance concern between the countersunk vs flat bolthead approach. I have 5.3L engine. While torquing the countersunk plate the bottom hole cracked. Not a good feeling!

My question/concern is if I go with the flat boltheads is there sufficient clearance between the top of the bolthead and the timing gear that spins around above the bolt heads. It appears as if there is, but GM must have had a reason to go with the countersunk style.
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Old Nov 19, 2023 | 08:46 PM
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I’ve never had a clearance issue while using the plate with outside bolt heads.
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Old Nov 21, 2023 | 09:38 PM
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The only time I have experienced an issue with the exposed bolt heads was with an aftermarket timing set that had a 1x cam gear. They did not clear the back of the cam gear and I had to switch to the recessed style cover and screws on that motor.
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Old Nov 30, 2023 | 12:53 AM
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Recessed bolts is a newer/updated design. So you can use either or with gen3 motor...
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