Re: Cam Core Dia for Big Lift
[Re: Dragula]
#3068626
08/16/22 08:33 PM
08/16/22 08:33 PM
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Joined: Jan 2003
Posts: 6,136 Melbourne , Australia
LA360
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Melbourne , Australia
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Based on comments made in previous posts, 60mm cores for Hemi engines are pretty common. The Fuel guys run them.
What do you consider to be "big" in regards to lobe lift?
Alan Jones
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Re: Cam Core Dia for Big Lift
[Re: LA360]
#3068661
08/16/22 09:55 PM
08/16/22 09:55 PM
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Joined: Jan 2003
Posts: 3,504 DFW
mr_340
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I have an older SS block that is machined for a 2.500" cam tunnel bore, Ford 2.125" cam journals. Ford Performance sells the five roller bearings at a good price. The stock front journal is about 50mm, so 55mm or 60mm are the next steps up in roller bearings after the BBF journal size. I'd check on availability and prices on cams before machining the block.
Floyd Lippencott IV
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Re: Cam Core Dia for Big Lift
[Re: Dragula]
#3068707
08/17/22 12:13 AM
08/17/22 12:13 AM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
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I Win
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I've read both 55MM and 60 MM cam cores and bearings being use for all out BB after market race blocks As already ask how much lift do you want to use? What rocker arm ratio? Lots of way to make things happen your way
Last edited by Cab_Burge; 08/17/22 12:15 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Cam Core Dia for Big Lift
[Re: Dragula]
#3068754
08/17/22 08:24 AM
08/17/22 08:24 AM
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Joined: Jan 2003
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JERICOGTX
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A coated cam bearing, and using a heavier weight oil will be your best bet for a Drag Week combo. Oil temp, and valve spring cooling is the key to surviving Drag Week. Also using bushed components, instead of needle bearings is another DW must use type deal. making a car work on the track is completely different than one that needs to drive 250-300 miles per day. The drives take out more cars, then the track.
69 GTX
68 Road Runner
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Re: Cam Core Dia for Big Lift
[Re: JERICOGTX]
#3068756
08/17/22 08:32 AM
08/17/22 08:32 AM
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Joined: Mar 2003
Posts: 9,099 Rogue River, OR
Jeremiah
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I like the Durabond coated cam bearings.
I was advised not to exceed .500 lobe lift and 900psi open spring pressure on a stock journal size cam core.
Something about the base circle getting small IIRC?
What are the first sogns of camshaft flex? Would you see it in the bearings first?
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Re: Cam Core Dia for Big Lift
[Re: Jeremiah]
#3068796
08/17/22 10:20 AM
08/17/22 10:20 AM
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Joined: Jan 2003
Posts: 8,021 Tulsa OK
Bad340fish
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I run a .730ish lift solid roller with a heavy spring on my small block. A recent inspection after 5 years revealed my cam bearings looked horrible. 3 drag weeks, 150-200 passes, and 5000-7000 miles maybe? I just went back with standard but will likely have this engine apart again before 5 years.
68 Barracuda Formula S 340
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Re: Cam Core Dia for Big Lift
[Re: Bad340fish]
#3068804
08/17/22 10:28 AM
08/17/22 10:28 AM
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Joined: May 2004
Posts: 12,384 Taxes & Virus's R-US, NY
Dragula
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I run a .730ish lift solid roller with a heavy spring on my small block. A recent inspection after 5 years revealed my cam bearings looked horrible. 3 drag weeks, 150-200 passes, and 5000-7000 miles maybe? I just went back with standard but will likely have this engine apart again before 5 years. Yeah, that is what I am afraid of....No good way to inspect them either....I put 2000 miles on mine last summer, and zero so far this year, but...
Last edited by Dragula; 08/17/22 10:28 AM.
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Re: Cam Core Dia for Big Lift
[Re: Dragula]
#3068857
08/17/22 12:23 PM
08/17/22 12:23 PM
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Joined: Jan 2003
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Al_Alguire
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Whats big lift? As mentioned 55 and 60MM are pretty common. If it is a wedge much harder to come by at times. Hemi/Predator stuff much asier to find as the blown alky guys use the bigger cores. IMO most any cam selection over .800 will greatly benefit from a larger than stock core, there is a surprising amount of flex with BIG lift cams and the normal big lift springs they require. Getting the block machined would be your next issues. But Weston Machine can handle it and do it right and he's in NJ so not that far away for you.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Cam Core Dia for Big Lift
[Re: Bad340fish]
#3068879
08/17/22 02:08 PM
08/17/22 02:08 PM
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Joined: Mar 2003
Posts: 9,099 Rogue River, OR
Jeremiah
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I run a .730ish lift solid roller with a heavy spring on my small block. A recent inspection after 5 years revealed my cam bearings looked horrible. 3 drag weeks, 150-200 passes, and 5000-7000 miles maybe? I just went back with standard but will likely have this engine apart again before 5 years. What spring pressures are you running? 260-280 on the base and 700-740 on the nose (open)?
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Re: Cam Core Dia for Big Lift
[Re: Jeremiah]
#3068883
08/17/22 02:16 PM
08/17/22 02:16 PM
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Joined: Jan 2003
Posts: 8,021 Tulsa OK
Bad340fish
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Shimmed like I have them they are probably 250 on the seat, not sure what open is but I doubt it is as high as you mention. I lose a lot of lift due to the 59* lifter angle and the offset intake pushrod so they are shimmed up a fair amount to be .050-.060 from coil bind. These springs did two drag weeks and still checked out within spec on seat pressure, did a third with them and retired them for a larger cam and the comp 955 spring that is a little heavier.
68 Barracuda Formula S 340
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Re: Cam Core Dia for Big Lift
[Re: Al_Alguire]
#3069317
08/18/22 05:52 PM
08/18/22 05:52 PM
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cuda499
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Whats big lift? As mentioned 55 and 60MM are pretty common. If it is a wedge much harder to come by at times. Hemi/Predator stuff much asier to find as the blown alky guys use the bigger cores. IMO most any cam selection over .800 will greatly benefit from a larger than stock core, there is a surprising amount of flex with BIG lift cams and the normal big lift springs they require. Getting the block machined would be your next issues. But Weston Machine can handle it and do it right and he's in NJ so not that far away for you. 100% Al, couldn't agree more. FWIW I just finished a block that i had 55mm cam core done with needle bearings. I had bullet make me a 55mm cam and we used a jessel key way lifter that uses a bushing instead of needle bearings. after it was machine, there was a couple places that had less the .200 of material left.
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Re: Cam Core Dia for Big Lift
[Re: cuda499]
#3069339
08/18/22 07:11 PM
08/18/22 07:11 PM
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Joined: Jan 2003
Posts: 9,986 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I currently run a stock cam core, .868 gross lift, .510 lobe lift, stainless valves, 7500 rpm max. Flex when checking lash showed an increase of . 005 to . 006 in lash around the base circle from flex and compression. I would love to see a spintron video of what is going on at 7500 rpm! A move to a bigger cam core, higher rocker ratios and Ti valves is all in the interest of a better race valvetrain.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Cam Core Dia for Big Lift
[Re: gregsdart]
#3069484
08/19/22 10:41 AM
08/19/22 10:41 AM
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Joined: Jan 2004
Posts: 4,564 Motor City
6PKRTSE
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I have a 55MM camshaft with roller cam bearings and over .800 lift in my street/strip Hemi.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Cam Core Dia for Big Lift
[Re: 6PKRTSE]
#3069499
08/19/22 11:11 AM
08/19/22 11:11 AM
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Dragula
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I have a 55MM camshaft with roller cam bearings and over .800 lift in my street/strip Hemi. How many street miles on it? Are you ever afraid of the roller bearings finding their way into somthing else?
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Re: Cam Core Dia for Big Lift
[Re: Dragula]
#3069535
08/19/22 12:15 PM
08/19/22 12:15 PM
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Joined: Jan 2004
Posts: 4,564 Motor City
6PKRTSE
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I have a 55MM camshaft with roller cam bearings and over .800 lift in my street/strip Hemi. How ma ny street miles on it? Are you ever afraid of the roller bearings finding their way into somthing else? Over 5 years and thousands of miles. So far so good.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Cam Core Dia for Big Lift
[Re: 6PKRTSE]
#3069539
08/19/22 12:20 PM
08/19/22 12:20 PM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
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Your example is perfect showing not all parts respond and perform the same What brand did you buy and use? Did you have the rear cam bearing enlarge also for the 55MM or leave it stock and use a stock Babbit type rear stock bearing their?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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