looking for input from anyone who has tried the comp cams xtrem marine xm284hr 112 lobe separation 110 center line, 230int / 290 ex duration @.50. looking in this area for lift .547 but want to stay away from big duration. pleasure/ performance boat. p.s. fairly long no wake zone to get to the big water if that matters.

It's 230/236 @ .050. Never used it but it's slightly smaller than the 741.

https://m.summitracing.com/parts/cca-11-451-8

Sorry rob I haven't but what is the build consist of. Heads, CR, carb etc. As long as your going hyd roller I think there's better options for you but again I haven't personally used it in a build but I'm sure I've seen it here on a thread more than once. Do a quick search otherwise.

Slightly?

don't know anything abought the 741 489ci .030 over 4.25 stroke, 049 oval ports big valves intake to be discussed at a latter time. 9.4 cr holly 750 marine mech secondary.

https://www.summitracing.com/parts/c...MobileSwitchNo

The 049 heads are a good head but you might actually consider the comp cam. What size valve did you go with. You could probably run the 741. Very common proven marine cam. Heads just going to hold you back some.

Yes slightly. Which isn't an exact term of measurement. The stock 502 mag can to me would be dramatically smaller than the 741.

I had that cam in my Corsa in a bored over 427...


4.310" bore x 3.760" stroke.

TRW LF2300 pistons 16.8cc dome

781 heads with some mild porting.

2.06" intake 1.72" exhaust valves

9.0:1 - 9.3:1 Compression ratio depending on chamber size.. (not sure)

Weiand Team G Intake with a 9022 Holley 800 Carb.

Eddie Marine EMI Thunder exhaust witht he long risers...


Ran GOOD.. 68 mph


https://www.youtube.com/watch?v=2UX0wQBukI8

how was the idle?

Who makes the 741 what are the specs you guys have got me looking.