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Old 02-16-2017, 05:06 PM   #1
jhastings
 
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Block Prep/Clay Valves

Fellas,
Getting ready to put this motor back together, but had a couple quick questions as I need to prep block and check piston to valve clearance with clay.

1. I scraped deck smooth, but still has discoloration. Someone mentioned running over the deck with WD-40 and a true bar (don't have one) wrapped in some sand paper to knock off high spots? Would this remove to much material or score too much? Would a sanding block not be true enough?

2. I'm putting head on with old head gasket that's already crushed. Can I just clay #1 cylinder for ptvc or do I need to check others? Ok to just torque a few studs down?

Thanks

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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
Old 02-16-2017, 05:43 PM   #2
jasonc

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Just make sure the deck is perfectly clean, check with a new sharp razor blade, don't worry with the color. Be carefull with the air sander discs. Kids playdo works good as clay and is easy to find.
 
Old 02-16-2017, 05:45 PM   #3
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Definitely no discs. Is razor blade clean good enough?

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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
Old 02-16-2017, 05:46 PM   #4
jasonc

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I usually check 1 and 6 and if they clear well call it good. If my cam was pushing the limits on clearance do all 6.
 
Old 02-16-2017, 05:49 PM   #5
jasonc

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Quote:
Originally Posted by jhastings View Post
Definitely no discs. Is razor blade clean good enough?

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I usually use the less abrasive air discs, just being careful and go around the dowl pins good with a new razor blade. Just make sure it is absolutely clean. Kinda hard to do quick without an air tool but scrape it good.
 
Old 02-19-2017, 09:46 PM   #6
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Put the head on with old stock hg and just clayed #1 cylinder. Adjusted valve lash to .025" on both I and E. Spun the motor a couple times and this is what I got.

0.035" intake PTVC and 0.058 exhaust.

Is that enough? If I need more, I can go with 0.010" over hg.IMG_20170219_165909399.jpg

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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
Old 02-20-2017, 08:52 AM   #7
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no it isn't enough on the intake just retard your cam timing with a 5 degree off set key and i think you will be good or maybe a 2 degree would be enough I know enterprise sells a 5 degree.
 
Old 02-20-2017, 08:55 AM   #8
Win slow

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A .010 gasket might not hurt for extra safety. You were not going to run your intake at .025 lash were you?
 
Old 02-20-2017, 10:02 AM   #9
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Ok. Out of curiosity, how many degrees is a tooth? (360/#teeth?) No I'll use stock lash (0.010 and 0.020?)

What's the downside to 0.010 over hg? Lower compression?

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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
Old 02-20-2017, 10:44 AM   #10
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I count 72 teeth. 360°/72=5°\tooth




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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
Old 02-20-2017, 10:49 AM   #11
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Quote:
Originally Posted by jhastings View Post
Ok. Out of curiosity, how many degrees is a tooth? (360/#teeth?) No I'll use stock lash (0.010 and 0.020?)

What's the downside to 0.010 over hg? Lower compression?

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You should've lashed your valves to what you're intending to run them at. You're more like .020" clearance on your PTV now instead of .035".
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Old 02-20-2017, 10:54 AM   #12
Win slow

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1 tooth is 10 crank degrees 5 cam because the cam spins half the speed. I was probably wrong on the 5 degree key that is probably too much and would make your exh tight. 2 is better
 
Old 04-22-2017, 08:42 PM   #13
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So I had a stock cam ground by Oregon Cam that is a mild profile. I put it in today and then clayed the ptvc with my old stock hg. I then set valve lash at .010" intake and .020" exhaust. I spun the motor then took it all apart. The ptvc are 0.060" intake and 0.070" exhaust.

Can I run a stock hg or should I go 0.010" over?

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1998 2500 12V SLT QCLB 5-speed 4X4 3.54, LSD F+R, 62/68/12, DDP2, 4"exhaust,841 Pump, 16* timing, #10 full back, 3K GSK, 191's, Oregon Cam, 13 " Con-O 241HD, ARP Studs, 60# over springs, 4" inline pacbrake, 226K.
 
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