Goto 540 or Tweek out the 489
05-02-2022, 06:45 AM
#21
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I’d guess about 40 hp or so going up 10* and similar lift.
05-02-2022, 10:44 AM
#22
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Originally Posted by SB
I’d guess about 40 hp or so going up 10* and similar lift.
05-02-2022, 11:02 PM
#23
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I just read about a thousand post on failed Marine Kinetics cams. Now I am nervous. I did not have a catastrophic failure before my rebuild and it did hold up for several years. But I did have a ton of valve leakage on the leak down test before rebuild. I had 8 rocker arms that needed rebuilt. Not sure if they were exhaust or intake. I was burning at least a quart of oil per day trip at the end. I am now getting regular oil analysis and this should give me a heads up. I had at 4 of them done last year and it was better after I added the oil thermostat. Any advise?
05-03-2022, 06:58 AM
#24
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More round table talk….
Another note: if you are truly at 10.3:1, the cam you have is too short in duration. The cam you have was trying to achieve more cylinder pressure , which you don’t need nor want now.
Note#2: You where reving 5500rpm. My guess is that was just passed max power. 224 is a tow truck cam for near 500cid.
Somewhere 236-240 at .050” intake duration is where your motor will want to eat. Prob 240
You have an exhaust to handle it?
Another note: if you are truly at 10.3:1, the cam you have is too short in duration. The cam you have was trying to achieve more cylinder pressure , which you don’t need nor want now.
Note#2: You where reving 5500rpm. My guess is that was just passed max power. 224 is a tow truck cam for near 500cid.
Somewhere 236-240 at .050” intake duration is where your motor will want to eat. Prob 240
You have an exhaust to handle it?
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getrdunn (05-03-2022)
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jeffswav (05-03-2022)
05-03-2022, 07:50 AM
#26
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Originally Posted by getrdunn
The last 496 builds I had custom comp grinds.
244/248 with dart 310 cc heads. Peaked at 6k. Just a reference….
244/248 with dart 310 cc heads. Peaked at 6k. Just a reference….
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jeffswav (05-03-2022)
05-03-2022, 10:06 AM
#27
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Originally Posted by SB
More round table talk….
Another note: if you are truly at 10.3:1, the cam you have is too short in duration. The cam you have was trying to achieve more cylinder pressure , which you don’t need nor want now.
Note#2: You where reving 5500rpm. My guess is that was just passed max power. 224 is a tow truck cam for near 500cid.
Somewhere 236-240 at .050” intake duration is where your motor will want to eat. Prob 240
You have an exhaust to handle it?
Another note: if you are truly at 10.3:1, the cam you have is too short in duration. The cam you have was trying to achieve more cylinder pressure , which you don’t need nor want now.
Note#2: You where reving 5500rpm. My guess is that was just passed max power. 224 is a tow truck cam for near 500cid.
Somewhere 236-240 at .050” intake duration is where your motor will want to eat. Prob 240
You have an exhaust to handle it?
Last edited by jeffswav; 05-03-2022 at 10:11 AM.
05-04-2022, 10:38 PM
#28
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SB (05-06-2022)
05-05-2022, 12:26 PM
#30
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Originally Posted by jeffswav
Anyone have experience with this cam?
https://www.cpperformance.com/p-1675...-camshaft.aspx
https://www.cpperformance.com/p-1675...-camshaft.aspx
This would be a little easier on VT
623 hp at 6k on my 496’s - same duration!
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jeffswav (05-06-2022)
