Valve Springs with 741 cam
05-21-2018 | 05:27 AM
#1
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From: Townsville Australia
Valve Springs with 741 cam
Will these springs, crane 99876-16 work with the crane 741 cam? O.D.1.565 I.D. 11.146 I.D. 20.740 DamperYes Seat Press.190 lbs @ 1.950 Open Press552 @ 1.250 Coil Bind1.200 Max Net Lift w/ .060 clearance0.690 Rate(lbs/in.)504 lbs/in. Installed Height1.950
05-21-2018 | 01:55 PM
#5
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From: Townsville Australia
Thanks.
Is this spec too small?
Max Lift: .580
Coil Bind: .740
Intake Install: 145lbs @ 1.9
Exhaust Install: 145lbs @ 1.9
Closed Sear Pressure: 145lbs
Open Seat Pressure: 360lbs
Is this spec too small?
Max Lift: .580
Coil Bind: .740
Intake Install: 145lbs @ 1.9
Exhaust Install: 145lbs @ 1.9
Closed Sear Pressure: 145lbs
Open Seat Pressure: 360lbs
05-21-2018 | 04:24 PM
#8
Registered
Joined: Oct 2013
Posts: 2,888
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From: SF Bay Area
What’s your installed spring height? I just researched springs for the 525EFI cam, near identical to the 741, and the Comp cams catalog called for the 929 springs but the general consensus was they’re junk. I called Comp cams and they recommended the 953 springs. But you really need to find your installed spring height and call a tech line for recommendations.
05-21-2018 | 07:25 PM
#9
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Joined: Jul 2004
Posts: 11,332
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From: chicago
For what its worth. The GM crate ZZ572 ran 200lbs seat, 500lbs open. 630 lift hydraulic roller street engine. 6000rpm max.
it also used 11/32 valves, not the heavier 3/8 valves merc/gm used in alot of engines.
it also used 11/32 valves, not the heavier 3/8 valves merc/gm used in alot of engines.
Last edited by MILD THUNDER; 05-21-2018 at 07:39 PM.
05-22-2018 | 12:21 PM
#10
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
What’s your installed spring height? I just researched springs for the 525EFI cam, near identical to the 741, and the Comp cams catalog called for the 929 springs but the general consensus was they’re junk. I called Comp cams and they recommended the 953 springs. But you really need to find your installed spring height and call a tech line for recommendations.
The 525 EFI is a different breed all together in how mercury set them up and require different hardware than conventional style heads and even aftermarket heads.
Last edited by Panther; 05-22-2018 at 12:25 PM.
