77 DIMARCO
04-01-2008, 02:47 AM
i'm not even sure if i asked this question before,but if i did it's gone now.
77 dimarco runner bottom
chevy 350 .030 over,flat top pistons
202/160 aluminum heads 190 cc runners,62 cc chambers
single plane intake
holley 750 jetted up 2 in secondaries,1 in primary
15% overdrive in the box
10 7/8 x 16 prop(courtesy of tom bentley last year)((NICE prop))
the only thing other than a foot pedal for the cavitation (trim) plates i have
not yet done is the cam,i want to do this this spring.
I know not knowing what i have is probably frowned upon,but i got a smokin'
deal on a long block from a racer-freinds engine builder and the cam card got
lost the same weekend as pick-up,the only things i remember are .477 and
clevite,i don't even know if .477 is intake or exhaust.....................
current numbers on flat water(speed goes up in high chop,air out the hull)...54-56 mph @ 4300-4500 rpm,i think i need a high lift,high duration cam
but i don't know what to expect as far as behavioral changes...........
i want to get more rpm's out of her(maybe 5800-6000) but i also absolutely
have to be able to pull a skier(or three for a pyramid),i[think that i understand
that you can cut down a prop to zing the motor(like a high stall convertor in
a street car) but i don't know what effect the "big" cam will have on idle,
keeping it from stalling when engageing the trans,pulling up a skier,etc.
now for my questions,what size cam?????
what will it do?????
what's more important,lift,lobe seperation(i have glenwood wet logs),or
duration to achieve some rpms?????
i was thinking of a lunati voodoo cam kit 638-60104lk,.504" lift,276 duration,
2200-6400 rpm range but the big thing is what happens between idle
and 2200 rpm????(i think i'll be in trouble if i rip my wife's arms off the first time pulling her up this year)
anyway i know there are alot of guys that know waaay more about v-drives
than i do(this is my first v-drive and my first boat) and i would greatly
appreciate any help,the ice is almost gone from the lakes and it's time to
put a cam in the boat(i think).
thanks,
nate
77 dimarco runner bottom
chevy 350 .030 over,flat top pistons
202/160 aluminum heads 190 cc runners,62 cc chambers
single plane intake
holley 750 jetted up 2 in secondaries,1 in primary
15% overdrive in the box
10 7/8 x 16 prop(courtesy of tom bentley last year)((NICE prop))
the only thing other than a foot pedal for the cavitation (trim) plates i have
not yet done is the cam,i want to do this this spring.
I know not knowing what i have is probably frowned upon,but i got a smokin'
deal on a long block from a racer-freinds engine builder and the cam card got
lost the same weekend as pick-up,the only things i remember are .477 and
clevite,i don't even know if .477 is intake or exhaust.....................
current numbers on flat water(speed goes up in high chop,air out the hull)...54-56 mph @ 4300-4500 rpm,i think i need a high lift,high duration cam
but i don't know what to expect as far as behavioral changes...........
i want to get more rpm's out of her(maybe 5800-6000) but i also absolutely
have to be able to pull a skier(or three for a pyramid),i[think that i understand
that you can cut down a prop to zing the motor(like a high stall convertor in
a street car) but i don't know what effect the "big" cam will have on idle,
keeping it from stalling when engageing the trans,pulling up a skier,etc.
now for my questions,what size cam?????
what will it do?????
what's more important,lift,lobe seperation(i have glenwood wet logs),or
duration to achieve some rpms?????
i was thinking of a lunati voodoo cam kit 638-60104lk,.504" lift,276 duration,
2200-6400 rpm range but the big thing is what happens between idle
and 2200 rpm????(i think i'll be in trouble if i rip my wife's arms off the first time pulling her up this year)
anyway i know there are alot of guys that know waaay more about v-drives
than i do(this is my first v-drive and my first boat) and i would greatly
appreciate any help,the ice is almost gone from the lakes and it's time to
put a cam in the boat(i think).
thanks,
nate