Reply With QuoteIt is a jet boat. The gas milage is going to suck regardless of what cam you have in it. Might as well go with a performance cam or at least some kind of RV cam MSD helped my olds also.
I'm trying to decide between a stock cam: 276/278 duration, .474/.472 lift.
And a aftermarket grind, I was thinking something along the lines of the Crane Powermax H-284-2 with 284/292 duration, .480/.496 lift.
Of course a stock cam is dirt cheap, but if it's going to drink fuel like a climbing cargo jet no matter what cam it has, I might as well put a real cam in it and make some power.
I should note that I'm gonna be running in the ocean. 90% of the time speed will be limited by conditions or space (inside the break-water)
It is a jet boat. The gas milage is going to suck regardless of what cam you have in it. Might as well go with a performance cam or at least some kind of RV cam MSD helped my olds also.
Thanks Moneysucker
I'm deffinately going to run some kind of ignition box. I'm leaning towards a Crane HI-6 since I've had one in my Mach 1 for 3 years and it's never skipped a beat.
Anyone tried a Crane unit in a boat?
MSD is the way to go. A 6AL Box, dist and coil all from MSD cant be beat.
As far as cam goes, Im soon to change mine to a Comp cam recommended by Dwayne at HTP. He says that its the best performing cam in a 455 that he has ever seen. He has built plenty of 455's over the years so im sure he knows. Its Comp part number 42-225-4 i think. Good luck.
I really like the looks of that cam that taylorman is talking about, I looked it up on comp's website: .541/.544 lift, 240/246@.050, 110 sep. I wish I'd seen this when the I was building mine. I went slightly more conservative with a Lunati 00083 .496/.520 224-234@.050 112 sep(reversion?). it sounds GOOD! and pulls hard to 5300, Thats all I get. 67 MPH. And yes it gets really shitty gas milage, Who knew?
fog
if your looking for a cam id stay away from anything that has bigger then a 110 lobe sep a 112 is not good for jet boats stick with around 108.my cam is a 548 lift and 248 258 at 50ths. its got a hell of a hole shot and tops out at 66.2 mph on the gps.
What piston's, intake, and heads are you all running?
This link will guide you
http://www.mondellotwister.com/Camshafts.htm
I run the JM-29 and love that lopeie sound.
Taylorman, I run Speed-Pro: L2323F-060 Forged pistons, Heavily ported C heads, and a gasket matched Torker. 850 Demon DP carb.
fog
Originally posted by CrdStang
I'm trying to decide between a stock cam: 276/278 duration, .474/.472 lift.
And a aftermarket grind, I was thinking something along the lines of the Crane Powermax H-284-2 with 284/292 duration, .480/.496 lift.
Of course a stock cam is dirt cheap, but if it's going to drink fuel like a climbing cargo jet no matter what cam it has, I might as well put a real cam in it and make some power.
I should note that I'm gonna be running in the ocean. 90% of the time speed will be limited by conditions or space (inside the break-water)
I used that cam spec in a 440 mopar on the street(69 Charger) and loved it.But I agree with the other guys,you can go more than that. When it comes to a jet boat,gas mileage depends on how you drive.I had an 78' Tahiti/454/750 holley with 18 gallon tank, years ago. I could run all day on a tank cruising,or burn a tank in a hour hauling a$$.
my2 cents.......
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