newb olds ?'s

« **on:** March 15, 2009, 07:51:25 PM »

hey hows it going. im new to this whole jet boat hobby and this web site. i just had some ?'s about the olds 455 like tips and what not to just have a fun cruiser for the lake this summer. i just bought my first boat a 21' 74 witch craft daycruiser i got two 455 with it and cant wait to get home and start playing with. any advise and comments on the bost and motor would be appreciated thanks. ill post some pics of the boat when i get home next week as im a truck driver.

« **Reply #1 on:** March 16, 2009, 08:49:14 PM »

Quote from: 74wtchcrft on March 15, 2009, 07:51:25 PM

hey hows it going. im new to this whole jet boat hobby and this web site. i just had some ?'s about the olds 455 like tips and what not to just have a fun cruiser for the lake this summer. i just bought my first boat a 21' 74 witch craft daycruiser i got two 455 with it and cant wait to get home and start playing with. any advise and comments on the bost and motor would be appreciated thanks. ill post some pics of the boat when i get home next week as im a truck driver.

Keep it simple and pay your attention to the oiling system (we'll happily help you,we bulid a half dozen or so a season ) Olds work well with Mild cam ,8.5 to 10.25 compression , dfdp 750 Holley ,msd dizzy and Edlbrock performer, Big (10 qt ) oil pan, oil resticted upper end and high pressure low volume O'pump . I'f you keep the RPMs below 4500 K and drive it conservetively you'll have a ball Good luck and welcome! JBP

« **Reply #2 on:** August 24, 2009, 08:41:59 PM »

Quote from: jet boat performance on March 16, 2009, 08:49:14 PM

Keep it simple and pay your attention to the oiling system (we'll happily help you,we bulid a half dozen or so a season ) Olds work well with Mild cam ,8.5 to 10.25 compression , dfdp 750 Holley ,msd dizzy and Edlbrock performer, Big (10 qt ) oil pan, oil resticted upper end and high pressure low volume O'pump . I'f you keep the RPMs below 4500 K and drive it conservetively you'll have a ball Good luck and welcome! JBP

Bringing this back from the dead, I'm thinking about picking up a 455 for my SJ. What kind of power can you get from the combo you just listed? Have any cam recommendation for an otherwise stock motor with a performer intake and mentioned carb?

« **Reply #3 on:** August 25, 2009, 12:15:37 PM »

I would be very interested in hearing the answer to this also.!!

I just bought a boat with a fresh 455, but it has a Tunnel Ram with dual Edelbrock 600's
9.75 to 1 compression
.40 over KB pistons
286 Isky cam
10qt pan,
big valves, etc.

It dyno'd at 450 hp & 550 torque

It almost seems like to much carb though.. wondering what the difference would be if i swapped out the T-Ram & duals for a Performer intake & a single 750 dp Holly.

I'm sure Tom @ JBP will be back by here soon. (or anyone else whos got some info/experience)

« **Reply #4 on:** August 25, 2009, 12:19:05 PM »

Quote from: Chili on August 25, 2009, 12:15:37 PM

It almost seems like to much carb though.. wondering what the difference would be if i swapped out the T-Ram & duals for a Performer intake & a single 750 dp Holly.

The diffrence would be lots of gas mileage and better bottom end performance.

74wtchcrft

newb olds ?'s

jet boat performance

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RickinDayton

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Chili

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Marcsrollin

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