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Old 09-09-2009, 04:49 PM   #1
stang8689
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Default How to check PTV clearance

I know ive heard use clay but I really have no idea what to do. Do I put some clay on the piston and just set the head gasket and head on and just hand tight the bolts then install the rockers and turn the engine over by hand? I imagine i wouldnt torque down on the new bolts and gasket and then remove them, any help would be appreciated.
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Old 09-09-2009, 05:27 PM   #2
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I use an old gasket. You'll need a solid lifter to do it correctly though.
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Old 09-09-2009, 05:34 PM   #3
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ok i have old gasket so do you torque all the head bolts how much clay do you use what kind of clay sorry I just want to make sure im doing this right
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Old 09-09-2009, 05:39 PM   #4
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you can use regular clay or even play dough. getting a solid lifter is important too. if you have new hyd. lifters you can adjust the rocker arm until the pushrod bottoms out in the lifter and do it that way. if you are using old roller lifters, you'll need to pop the clip out of the top of the lifter and remove the guts (not hard at all) to get all the old oil out of there or the lifter won't go all the way down.

btw, if using old roller lifters i'd recommend opening them all and giving them a good cleaning with some carb cleaner. if you have a non-roller cam (flat tappet style) you'll need to just toss those old lifters out anyways.
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Old 09-09-2009, 05:40 PM   #5
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You probably don't HAVE to torque it, but personally I would It's easy to lose .010 and not see it from something you THINK is tight. And model clay is good....don't use Play-Doh...it will expand back some after compressed. You just need enough to fit in the valve recesses so the valves can set down into it.
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12.80 at 110.5mph NHRA DA corrected
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Old 09-09-2009, 06:00 PM   #6
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You don't really need to use a head gasket either. Just remember when you measure clearance to add the compressed thickness of the gasket into the clearance you just measured.
I've always used just 4 bolts that are for 1 cylinder and just sort of tighten them down to maybe 25 ft/lbs.
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Old 09-09-2009, 06:07 PM   #7
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ok im starting to get it now but what bout the lifters I dont think I have any old ones its a roller engine so should i try to get a couple old lifters and clean them out
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Old 09-09-2009, 06:12 PM   #8
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Just buy 1 solid lifter from summit to use for checking.
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13.20's with 2.25-2.30 60's, 40+ year old suspension sucks!
Best trap 107.11mph, we'll see what the new intake/carb setup does.
12.80 at 110.5mph NHRA DA corrected
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Old 09-09-2009, 08:42 PM   #9
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What are some good numbers as far as clearance, like whats the closest wanna be?
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Old 09-09-2009, 08:57 PM   #10
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http://www.fordmuscle.com/fundamenta...ve/index.shtml

http://www.peteandersonracing.com/PTV.html
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Who cares how much horsepower it has, all that matters is how fast it goes!

13.20's with 2.25-2.30 60's, 40+ year old suspension sucks!
Best trap 107.11mph, we'll see what the new intake/carb setup does.
12.80 at 110.5mph NHRA DA corrected
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