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Old 01-13-2013, 03:07 PM   #1
Join Date: Feb 2012
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Default Carb upgrade

I need to rebuild my carb on my '97 2100sr w/ 5.7l. I am considering upgrading to a 4bbl carb. Has anyone done this? Was it worth it?

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Old 01-14-2013, 12:18 AM   #2
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Old 01-14-2013, 01:11 AM   #3
Join Date: Aug 2010
Location: Purcellville, VA.
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I have been contemplating the same thing. Mine is 96 5.7 2bbl and she will run about 53-54 with a 19P 3 blade. Not sure if I want to spend all that $ just to get 4-5 more MPH out of it and have to stop at the pump more often. I really don't think I will gain anything on holeshot, just top end.
My brother has an 85 5.7 4bbl (listed at 260hp) and his will do 58 with 2 on board with 21P 3 blade (Chapparel 200XLC which is just under 21ft and is about 2800lbs empty).
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Old 01-22-2013, 06:13 PM   #4
Lt. JG
Join Date: Sep 2010
Posts: 18

I have a 2001 3300scr with twin 5.7 and 2 barrel carbs.
Im planing on having mine converted this year to 4 barrel webers with new intakes.
Currently i have 19 pitch 19 inch SS props (Bravo 2) .
By gettin another 15 hp out of each side I can afford to go 21 pitch props.
Out of the hole I will use more fuel but once on plane and in my new sweet spot, 3 or 4 MPH faster and less rpm I should save fuel on longer cruises.
The only question I have is should i be looking at 4 blade props or stick with 3?
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