Offshoreonly.com - 509 cams and lifters help.

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Bajaorlando

12-29-2018 04:57 AM

The stock lifters can be used on a 741?

getrdunn

12-29-2018 12:08 PM

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.

getrdunn

12-29-2018 12:15 PM

Quote:

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.

Thats good to know and doesn't seem t oget talked about much. What's est peak hp in a 502-509 with that cam? 5,700/5,800? Just taking a stab at it.

Baja Rooster

12-29-2018 12:47 PM

Quote:

Originally Posted by Bajaorlando (Post 4665812)

The stock lifters can be used on a 741?

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.

mike tkach

12-29-2018 04:31 PM

Quote:

Originally Posted by Baja Rooster (Post 4665880)

base circle is the same,only thing different is the lsa,74 1 is 112,525 efi cam is 114.

tripps

12-29-2018 07:16 PM

Cam

What can is the 8.1L cam???

Ryan00TJ

12-29-2018 07:18 PM

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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