how big is your cam? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gabet40 · 09-04-2002, 11:52 AM

ive got a crane powermax cam and all the papers that give me that lift and durations, and loads and all that. but whats the one number that people use when tellin exactly what size it is, hence, how big of a difference it makes?
i dont think mine is too big, but the lift is 3027 intake and 3200 exhaust, with a rocker arm ratio of 1.5, advertised duration is 272? intake, and 284? exhuast.

Beast388 · 09-04-2002, 12:04 PM

The most common way to talk the "cam talk" is by valve lift and duration at 0.050 lift. The valve lift is a constant number between cam manufacturers but the duration numbers can be different. Some companies rate the duration at 0.050 lift or 0.006 tappet lift. So that can make comparing cams a little difficult because they aren't using the same parameters.

But if someone were to ask how big your cam is, you would say: 0.454 Intake / 0.480 Exhaust lift with 272/284 advertised duration.

Mike C · 09-04-2002, 02:53 PM

Beast is correct, but to clarify a little... Talk about cams duration at .050 tappet lift, but valve lift should be specified at zero lash for a hydraulic tappet and net lift if mechanical or the valve lash should be specified if quoting gross lift figures.

Longhorn Man · 09-04-2002, 11:08 PM

My cam is about 2 feet long...give or take.

*Zkast* · 09-04-2002, 11:27 PM

lol u goof! :p

09-04-2002, 11:52 AM	#1
gabet40 Registered User Join Date: Dec 1999 Location: Modesto, CA Posts: 565	how big is your cam? ive got a crane powermax cam and all the papers that give me that lift and durations, and loads and all that. but whats the one number that people use when tellin exactly what size it is, hence, how big of a difference it makes? i dont think mine is too big, but the lift is 3027 intake and 3200 exhaust, with a rocker arm ratio of 1.5, advertised duration is 272? intake, and 284? exhuast. __________________ Current owner of 2016 2500 Silverado Midnight Edition. Former owner of: 69 1/2 ton, change from long/fleet to short/fleet, shaved door handles, shaved tailgate, 4/6 drop, power windows, 700r4 72 blazer, 350 with Holley Commander 950 DFI, crane energizer cam, 350 tranny, dual sanderson blockhuggers/magnaflow exhaust

09-04-2002, 12:04 PM	#2
Beast388 Suburbans RULE! Join Date: Jan 2000 Location: Clinton, IA 52732 Posts: 689	The most common way to talk the "cam talk" is by valve lift and duration at 0.050 lift. The valve lift is a constant number between cam manufacturers but the duration numbers can be different. Some companies rate the duration at 0.050 lift or 0.006 tappet lift. So that can make comparing cams a little difficult because they aren't using the same parameters. But if someone were to ask how big your cam is, you would say: 0.454 Intake / 0.480 Exhaust lift with 272/284 advertised duration. __________________ --Ben 71 GMC Suburban 4X4 The "Beast" 388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's.

09-04-2002, 02:53 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	Beast is correct, but to clarify a little... Talk about cams duration at .050 tappet lift, but valve lift should be specified at zero lash for a hydraulic tappet and net lift if mechanical or the valve lash should be specified if quoting gross lift figures. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

09-04-2002, 11:08 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	My cam is about 2 feet long...give or take.

09-04-2002, 11:27 PM	#5
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	lol u goof! :p



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