Cam Help on 502
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Cam Help on 502
Ok I have done a lot of searching and reading on this topic here on OSO but can't find the info I need. I'm building a pair of 502's 9.5:1 RPM or Air Gap intakes. GM Rect Port heads pocket ported and valves have been deshrouded. Exhaust for now is a manifold with riser water dumps outside of the transom so reversion should not be a problem. What I would like to run is a 230 238 on a 110 or 112 LSA but I can not find a grind like that. So these seem to be my best choices. Which would you run.
Comp XM278H
intake 234 564
Exhaust 244 567
LSA 112
or
Comp XM270H
Intake 226 544
Exhaust 236 547
LSA 112
Any other suggestions would be great as well. I want a 110 to 112 LSA for sure.
Thanks Rob
Comp XM278H
intake 234 564
Exhaust 244 567
LSA 112
or
Comp XM270H
Intake 226 544
Exhaust 236 547
LSA 112
Any other suggestions would be great as well. I want a 110 to 112 LSA for sure.
Thanks Rob
#2
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Re: Cam Help on 502
Rob,
I have been reseaching cams for my 502 also and this is close to what you want,
Crane 761 230*in 236*ex .598 .610 112*lsa . I will have some HP500 parts for sale soon , cams, ignition moduals, heads. I know of a set of used 761 cams, new condition, pm me if interested.
I have been reseaching cams for my 502 also and this is close to what you want,
Crane 761 230*in 236*ex .598 .610 112*lsa . I will have some HP500 parts for sale soon , cams, ignition moduals, heads. I know of a set of used 761 cams, new condition, pm me if interested.
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Re: Cam Help on 502
Thanks wags but for as cheap as cams are I don't think I'd take a gamble on used ones. I did see that cam the only thing I didn't like was the big lift. Seems like it would wear out springs quick. What kind of results did they get with that cam?
Rob
Rob
#5
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Re: Cam Help on 502
I suggest that you contact Bob Madara (aka. RMbuilder) on this board and have him custom spec a cam for your application. I have been fortunate to have spent some time with Bob. This guy is brilliant when it comes to valvetrain selection and setup.
The marine market is very specialized. The component manufacturers are geared to the automotive market. Bob has the knowledge for what it takes to have a successful marine engine.
The marine market is very specialized. The component manufacturers are geared to the automotive market. Bob has the knowledge for what it takes to have a successful marine engine.
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Re: Cam Help on 502
Originally Posted by Griff
Those look like flat tappet lifts. Why not use a Crane 741 roller and make more power???
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Re: Cam Help on 502
Originally Posted by RLW
I suggest that you contact Bob Madara (aka. RMbuilder) on this board and have him custom spec a cam for your application. I have been fortunate to have spent some time with Bob. This guy is brilliant when it comes to valvetrain selection and setup.
The marine market is very specialized. The component manufacturers are geared to the automotive market. Bob has the knowledge for what it takes to have a successful marine engine.
The marine market is very specialized. The component manufacturers are geared to the automotive market. Bob has the knowledge for what it takes to have a successful marine engine.
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Re: Cam Help on 502
Originally Posted by mcollinstn
why such a tight lobe center? You gonna circle track race it?
Plus they sound way better than a 114 or higher.
#10
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Re: Cam Help on 502
Leathl,
Reed Cams makes a hydraulic roller 232*/238* @.050" lift (284*/290* advertised) .578"/.578" lift all on 112* lobes. In fact I have a pair of these cams right now and they have NOT been used and are made for a Mark-4 block. I paid about $250 each for these cams. I will sell them to you for $230 each if you like. Otherwise, I believe at least one good person to consult would be "rmbuilder" aka Bob Madara concerning cam selection.
Reed Cams makes a hydraulic roller 232*/238* @.050" lift (284*/290* advertised) .578"/.578" lift all on 112* lobes. In fact I have a pair of these cams right now and they have NOT been used and are made for a Mark-4 block. I paid about $250 each for these cams. I will sell them to you for $230 each if you like. Otherwise, I believe at least one good person to consult would be "rmbuilder" aka Bob Madara concerning cam selection.