Building up a Vortec 4.3
09-07-2010, 09:50 PM
#11
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Hi Guys,
Thanks for the info. The brothers that own the machine shop had the same to say about the motor. Sounds like it can be done but will be costly and that reversion thing…… dose not sound like fun. Think I’m going to keep it close to stock and use it to move to a larger boat next spring.
Thanks,
Speed.
Thanks for the info. The brothers that own the machine shop had the same to say about the motor. Sounds like it can be done but will be costly and that reversion thing…… dose not sound like fun. Think I’m going to keep it close to stock and use it to move to a larger boat next spring.
Thanks,
Speed.
09-10-2010, 05:03 PM
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Ok guys,
Looks like it’s coming down to up grading the cam or keeping the stock one. Here is what I have so far.
1997 4.3 vortec , (started life as a 225HP motor, not sure if that maters) pistons are now 60 over, Edelbrock Performer Intake and marine series 600 CFM Carb. Would adding a mild cam over the stock cam make much of a difference without the heads and valve work I keep reading about?
Thanks,
Speed
Looks like it’s coming down to up grading the cam or keeping the stock one. Here is what I have so far.
1997 4.3 vortec , (started life as a 225HP motor, not sure if that maters) pistons are now 60 over, Edelbrock Performer Intake and marine series 600 CFM Carb. Would adding a mild cam over the stock cam make much of a difference without the heads and valve work I keep reading about?
Thanks,
Speed
09-10-2010, 06:43 PM
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you could go to 1.6 Pro Magnum rockers and use the stock cam.. I don't think many cam companies stock 6 cyl blanks, unless Bullet or Crane have them.. you can get COMP to custom grind one from their blanks if you know the lobe profiles you want.. the Brodix heads would really wake it up..
09-11-2010, 08:25 AM
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the heads would be great, but trying to do this without putting much $$ into it. i have to add the intake and carb (previous owner lost them??) but the more i look around is sound like the cam alone will not do much so I may stick with the stock one.
Thanks,
Speed
Thanks,
Speed
09-11-2010, 08:40 AM
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let's see what fkboatman comes back with.... 
in your case just the intake, carb, IMCO exhaust, and 1.6 rockers would be it.. make sure you get the non guide plate rockers...
in your case just the intake, carb, IMCO exhaust, and 1.6 rockers would be it.. make sure you get the non guide plate rockers...
10-01-2010, 05:37 PM
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I have onlt seen one company that makes exhaust for the 4.3...
http://www.imcomarine.com/ca_store/i...roducts_id=805
I looked into this same thing 6-8 years ago and found it way to expensive to get any real gains from it. You will be much better off getting a used 350 or even a 454 and keep those stock and still have more HP than you could ever get out of a 4.3.
http://www.imcomarine.com/ca_store/i...roducts_id=805
I looked into this same thing 6-8 years ago and found it way to expensive to get any real gains from it. You will be much better off getting a used 350 or even a 454 and keep those stock and still have more HP than you could ever get out of a 4.3.
