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Old 01-08-2019, 12:27 PM
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Looking for a cam recommendation for my jet boat. I have a 18' jet boat that i have been running a high compression nitrous 5.3 in for a few years now. It runs really well and i have it pretty dialed in.

i have decided to make the change to turbos and i am working on my kit.

Here are the specs for the build
Iron block 5.7 boring a 5.3 to a 3.905
Edelbrock victor JR intake
Trick Flow gen x 205 heads (58cc)
JE -19.5cc Dish pistons/Scat rods/Stock crank
will have CSU build me a carb
Plan to run either 91, or avgas if i need more boost to hit my goals.
twin rev9 72/68's
No intercooler

im looking for a cam and i do not care about idle quality. I dont mind running decent fuel if i have to but would like to be where i want on 91.

My power goals are very reasonable i feel. Im guessing somewhere in the 800-850 Flywheel HP range will get me where i want to be. I was pretty happy with the on bottle performance of the boat before, and am only looking for a little bit more. Atleast with this hull, if i upgrade hulls i want the ability to "turn it up" for more performance later on if needed

Here are a few that im looking at, thoughts or any recommendations on other cams i am open to

BTR Turbo Stage 2 or 3 cam
TSP "Bald Eagle" LS1 Boosted cam
Lil John's motorsports Stage 2 or 3 twin turbo cam

or any other recommendations?

thanks
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Old 01-08-2019, 12:56 PM
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Stock ls1 cam would make 800 flywheel with that setup.
Choose a cam based on dynamic compression and the RPM range you need. Peak power output is going to hit your goals under almost any circumstance.
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Old 01-08-2019, 01:01 PM
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I had a stock 4.8 with a pair of those turbos and the LJMS Stage 2 TT cam. Car went 8.95 @ 153 at 3325lbs. Well over 900hp flywheel on e85. Should easily meet your goals with that bigger built motor.
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Old 01-08-2019, 01:02 PM
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Originally Posted by JoeNova View Post
Stock ls1 cam would make 800 flywheel with that setup.
Choose a cam based on dynamic compression and the RPM range you need. Peak power output is going to hit your goals under almost any circumstance.
I would rather have something with some decent sound at idle. I dont mind an agressive cam. I am currently running the BTR Stage 4 LS1 cam (235/242 .621/.595 111lsa)
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Old 01-08-2019, 01:04 PM
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Originally Posted by svslow View Post
I had a stock 4.8 with a pair of those turbos and the LJMS Stage 2 TT cam. Car went 8.95 @ 153 at 3325lbs. Well over 900hp flywheel on e85. Should easily meet your goals with that bigger built motor.
Thank you for the info.

What about the power range of this size turbo? I would like the engine to start making power somewhere around the 3500 rpm range.
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Old 01-08-2019, 01:07 PM
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My little 4.8 with a stock LS1 intake would go to 7200 all day. Was pretty dead under 4500 or so, but your motor will be a different animal.
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Old 01-08-2019, 01:11 PM
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Originally Posted by svslow View Post
My little 4.8 with a stock LS1 intake would go to 7200 all day. Was pretty dead under 4500 or so, but your motor will be a different animal.
Thank you, i am completely new to Turbo's and have never messed with them,
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Old 01-08-2019, 01:28 PM
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Originally Posted by steves86ta View Post
Thank you, i am completely new to Turbo's and have never messed with them,
I predict you’ll never go back!
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Old 01-08-2019, 01:29 PM
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Originally Posted by 3 window View Post

I predict you’ll never go back!
me too lol
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