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509 cams and lifters help.
I have 2 502 mags I rebuilt last year
looking for more power they dyno at 440 hp at 4700 536 tq at 3400 the way they sit now there now 509,s with gill performance exhaust 509 088 heads converted to holly 850 body carbs factory 502 mag cams oem lifters dont remember springs 1.7 rockers with stud girdles I need to talk to someone about a good cam selection with lifters and springs please and thank you. https://cimg6.ibsrv.net/gimg/www.off...7e085c5af2.jpg https://cimg0.ibsrv.net/gimg/www.off...d9910e5f76.jpg |
Crane 168731 or 168741 cam.
Comp 929 springs GM lifters should work What intake? Can't tell 100% by the pic. |
The famous 741 cam would be my choice as it's proven over and over again in that cubic inch range. If you wanna wake it up find a good set of 305 to 315 cc aftermarket heads. Not sure what HP your looking for however 600 plus is easily achievable. |
Crane 741 cam and Isky 8005 springs would be my choice.
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Originally Posted by Griff
(Post 4665475)
Crane 741 cam and Isky 8005 springs would be my choice.
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A cleanup on the heads and a larger intake valve will help with the cam upgrade. The 2.19 valve is small for a 502 bore.
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the heads really are holding it back,a set of engine quest heads and a crane 741 cam will get you 600 hp with 9.5 to 1 c/r.
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Originally Posted by sutphen 30
(Post 4665498)
that or maybe,the 8.1L cam thats 240/248 double swap,,works really well in warmed up 502's.
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Originally Posted by getrdunn
(Post 4665558)
what's the lift on that cam? |
That will wake it up! |
The stock lifters can be used on a 741? |
What gen engines are these? If I'm not mistaking though the mags where baby hyd rollers. If time for engine rebuild OT might consider replacing regardless. |
Originally Posted by sutphen 30
(Post 4665498)
that or maybe,the 8.1L cam thats 240/248 double swap,,works really well in warmed up 502's.
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Originally Posted by Bajaorlando
(Post 4665812)
The stock lifters can be used on a 741? |
Originally Posted by Baja Rooster
(Post 4665880)
The stock ZZ502 lifters were a great fit on my 525EFI cam which has identical specs to the 741. I don’t know if the base circle is different though. My lifters had very few hours on them so I reused them. |
Cam
What can is the 8.1L cam???
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http://www.cpgnation.com/comp-cams-xtreme-marine-525-efi-camshaft/
No need to reinvent the wheel. 525EFI cam works great for 502/509 builds. Comp grinds it if you can't find a Merc takeout. Your 088 heads are what needs attention and upgraded. Power is in the heads. |
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