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Roller Cam Upgrade

Old 01-18-2009, 01:30 PM
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Default Roller Cam Upgrade

I am thinking about switching out my flat tappet for a roller cam. I have done a lot of reserch and have I think I have it narrowed down to a few diffent cams.
Heres is my current setup.
Gen V 489 Stroker with 8.9 compression all forged internals
Holley MPI with 42lb injectors laptop progamable
EMI exhaust with long risers and O2 sensors
Large Oval 820 Heads 2.19/1.88, gasket matched and ported
I do not have any flow numbers but they are very similar to 049/781 except for a smaller 110CC chamber
My current cam is a

Lunati 30219
540/550 lift
230/235 duration
114 LSA

Here is what I have been looking at

Crane 268761
598/610
230/236
114 LSA
4/7 swap

Crane 169621
Same as the 268761 no 4/7 swap

Crane 139671
610/632
236/244
114 LSA

The 168731 looks like a good cam but I need 114 LSA for MPI

Any input would be appreciated.

Last edited by jeffswav; 04-17-2009 at 08:34 AM.
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Old 01-18-2009, 05:14 PM
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I have two cams out of Hp500 one carb one EFI with lifters . The carb cam is 222/230 576/598 .$ 275.00 plus shipping. The EFI cam is 230/236 598/610 dyno time only $ 450.00 plus shipping.
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Old 01-18-2009, 07:58 PM
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Contact RMBUILDER ([email protected]) and have one custom made for your application. He has done several for me with great results. He can set you up with everything you need.
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Old 01-18-2009, 10:59 PM
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Originally Posted by 1BIGJIM View Post
Contact RMBUILDER ([email protected]) and have one custom made for your application. He has done several for me with great results. He can set you up with everything you need.

I agree..."RMBUILDER"/Bob Madara of Marine Kinetics in N.Y. 585-654-8583. He is the cam guru and helped a lot of guys with custom cam combinations for marine offshore hi-perf engines----and it wont cost you anymore than a new "off the shelf" cam that you will pay from popular manufacturers.

Also, no offense to anyone, but you probably should not pay more than .50 cents on the dollar for a USED cam (i.e. $175 or so).
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Old 01-19-2009, 09:21 AM
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I sent Bob an email. I will wait and see what he thinks. I am in no hurry I have a few months before for boating season.
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Old 01-19-2009, 09:49 AM
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I just got off the phone with Bob. He will be getting back to me in a few days.
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Old 01-19-2009, 06:46 PM
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Originally Posted by jeffswav View Post
I am thinking about switching out my flat tappet for a roller cam. I have done a lot of reserch and have I think I have it narrowed down to a few diffent cams.
Heres is my current setup.
Gen V 489 Stroker with 9.3 compression all forged internals
Holley MPI with 42lb injectors laptop progamable
EMI exhaust with long risers and O2 sensors
Large Oval 820 Heads 2.19/1.88, gasket matched and ported
I do not have any flow numbers but they are very similar to 049/781 except for a smaller 110CC chamber
My current cam is a

Lunati 30219
540/550 lift
230/235 duration
114 LSA

Here is what I have been looking at

Crane 268761
598/610
230/236
114 LSA
4/7 swap

Crane 169621
Same as the 268761 no 4/7 swap

Crane 139671
610/632
236/244
114 LSA

The 168731 looks like a good cam but I need 114 LSA for MPI

Any input would be appreciated.
I would use the 500efi cam and be done with it, you should be close to 500hp, wouldnt go any bigger than that Crane 268761
598/610
230/236
114 LSA
4/7 swap
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Old 01-19-2009, 06:57 PM
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Another vote for Bob Madera... the guy really knows his stuff.

My dyno guy has been building circle track motors for 50 years and is very respected in my area. When he dynoed my last motor with one of Bob's cams in it, he was so impressed that he called Bob, and started using his cams in all his marine motor builds.

Chris
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Old 01-19-2009, 07:58 PM
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Originally Posted by KAAMA View Post
I agree..."RMBUILDER"/Bob Madara of Marine Kinetics in N.Y. 585-654-8583. He is the cam guru and helped a lot of guys with custom cam combinations for marine offshore hi-perf engines----and it wont cost you anymore than a new "off the shelf" cam that you will pay from popular manufacturers.

Also, no offense to anyone, but you probably should not pay more than .50 cents on the dollar for a USED cam (i.e. $175 or so).
I am using Bob Also this winter, As for offending me no you have not. but a new cam shaft from Summit $435.99 Lifters $565.45 , 3 hours on a dyno for $450.00. Less than $0.50 on the dollar.
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Old 01-20-2009, 01:51 AM
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I thought it was priced hig at first also, until I saw it came with the lifters. With lifters, its a very good price.
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