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Roger_Kilcrease

  • Karma: +0/-0
Building a Chevy 454 PLEASE HELP!
« on: March 16, 2015, 06:40:31 pm »
I have a 454 crate motor, block #14015445 (1975-1987) 4.2 bore with a 4 bolt main.

I think it's a Mark 4 engine. The cylinder heads are oval port with a casting #14092360.

What is my best combo with 1) camshaft 2)manifold 3)carb  with the least cost/ most power and reliability?

Any insight would be appreciated!
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mobboss

  • Karma: +15/-0
Re: Building a Chevy 454 PLEASE HELP!
« Reply #1 on: March 16, 2015, 07:02:08 pm »
First before anyone replys you are going to have to give some info on your boat and what you plan on doing with said boat as well as your wants and how hard you want to push your boat.


There is a ton of combos that will work but you have to be honest in what you really want and can afford.


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Roger_Kilcrease

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Re: Building a Chevy 454 PLEASE HELP!
« Reply #2 on: March 16, 2015, 07:20:50 pm »
I have a 1974 21' Pantera day cruiser which includes a jacuzzi pump with a place diverter in mint condition.

Will mostly be used for family fun (think wake boarding, cruising) with high reliability.

Won't be pushing it too hard for the next two seasons, may want to upgrade components down the road.

Willing to spend UP TO $2500.00 at this time.
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mobboss

  • Karma: +15/-0
Re: Building a Chevy 454 PLEASE HELP!
« Reply #3 on: March 16, 2015, 08:02:22 pm »
Now that is honest as hell!!!


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Flusher

  • Karma: +84/-0
Re: Building a Chevy 454 PLEASE HELP!
« Reply #4 on: March 16, 2015, 08:21:11 pm »
Is it running now?  What are your performance goals?  If the engine is sound, maybe some pump mods would be a better choice.  We avoid Jacuzzi, but the performance can be improved upon.  Might give Jack at MPD a call and see if he is still working on Jacuzzi.  Just thinking bang for your buck.  It's difficult to make noticeable performance gains with bolt-on parts unless that bolt-on is NOS or a blower.

If you like to tinker and want to learn about your engine, pick up a nice Cloyes adjustable timing set, degree wheel, and indicators and spend some time degreeing your cam.  Advancing it will build more cylinder pressure and rock the power curve about peak torque, favoring lower RPM.  Retarding cam timing will build less cylinder pressure and slightly favor power above peak torque.

My concern is that your engine probably has flat-top or dished pistons.  That will equate to low 8:1 compression ratios.  A bigger cam, heads, intake, carb, etc. without the compression to back it up, you could end up with a fuel hog that doesn't have the performance you expect.

A moderate investment of a set of Crane Gold high-ratio rockers would like a little more cam, but you could open a can of worms with valve springs and retainer clearance.

Good luck,

Joe
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

 


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