
04-30-2012, 02:53 PM
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CC Member
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Join Date: Sep 2009
Location: Hideaway, Texas,
TX
Cobra Make, Engine: Backdraft #318, 418 CI, 532 RWHP, Mass Flow Injected, TKO600-Road Race, BMW M3 Suspension, Race Springs (Wouldn't do it again, rough on the street).
Posts: 240
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Not Ranked
Brent's comments on setting methods and big overlap cams is starting to worry me. It's a big cam.
So, here is what I did to set the preload....and I do have time to redo!
1. went to #1, turn crank clockwise
2. exhaust vale opens and closes
3. intake opens and just as it closes completely (intake off easy to see) I stop
3. put the ratchet on the crank bolt at 12 o'clock and continue to turn it clockwise to 5 o'clock.
4. set the lash on both intake and exhaust.
5. continue to the next cylinder and do the same, and so on.
I marked the cam base circle centers with a felt tip before I put it in and this method brought those marks close to the roller.
So, I thought I was OK......maybe not. I'm not looking to invent a new way to do this and this may not be new anyway, but now I'm a bit worried.
Brent, lifters are Comp Cam rollers #851 and this is a retro fit motor with a spider and dog bones to hold the lifters in place.
In case it's important: Duration at .006 tappet lift Intake=299 Exhaust=305
Duration at .050 on the cam card = intake 248, exhaust 254
I installed it at 106 Intake centerline.
Guess there is more than one way to skin a cat, just hope mine is skinned!
Thanks for the help.
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Wayne Rogers in Hideaway, Texas
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