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Author Topic:   VALVELIFT
67coupe
Gearhead

Posts: 334
From: dallas NC usa
Registered: Nov 2000

posted 03-11-2001 10:45 PM     Click Here to See the Profile for 67coupe   Click Here to Email 67coupe     Edit/Delete Message   Reply w/Quote
Hey Alex or anyone else what is the biggest cam I can run in a 351C without doing any work to the heads or pistons. ive got 70 closed chamber 4bbl. heads and flat top pistons with small valve reliefs, trw #2379
I will be using crane 1.7 ratio roller rockers. i have been looking around a 560-590
lift. will it work? thanks for any help

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67 coupe soon to have 351c
87 bronco II on 33's
30 model A currently rustbucket

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SteveLaRiviere
Administrator

Posts: 29373
From: Saco, Maine
Registered: May 99

posted 03-12-2001 01:14 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Actually, duration plays more of a part than lift. With a 351C, you should verify piston-valve clearance with any cam over .500" lift.

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'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"

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Moneymaker
Administrator

Posts: 17471
From: Lyons, IL, USA
Registered: May 99

posted 03-12-2001 01:35 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
If you keep it at 260 or less duration at .050 you can run as high a .560 to .570 or so, but Steve, is correct, you should always verify piston to valve clearance.

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Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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mach72
Gearhead

Posts: 119
From: Bixby, Ok. USA
Registered: Jun 99

posted 03-12-2001 11:36 PM     Click Here to See the Profile for mach72   Click Here to Email mach72     Edit/Delete Message   Reply w/Quote
My cleveland has plenty of piston/valve clearance with a hyd. .540 I/.560 E Lift, with 290 I/300 E Duration (226/236 @ .050") 110 lobe center. Just like Steve and Moneymaker said " always check piston/valve clearance if running over .500" lift.

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