Holley 4150 (9381) 830 Jetting
#1
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Holley 4150 (9381) 830 Jetting
I know this is a sacrilege but I am going to detune the 500HP clone in my 22 Classic Donzi to make her more manageable around the marina.
502, 9.5/1, Dart heads, Gil exhaust (Long risers), Crane HP500 cam retarded to 111* ATDC
Currently running a HP500 World Products single plane high rise.
Going to a GM dual plane aluminum high rise.
Currently running 78s and 6.5 power valve in Primaries, 91s w/plugged power valve in Secondaries.
Sea level
Does this jetting sound about right for the dual plane?
THANKS!
502, 9.5/1, Dart heads, Gil exhaust (Long risers), Crane HP500 cam retarded to 111* ATDC
Currently running a HP500 World Products single plane high rise.
Going to a GM dual plane aluminum high rise.
Currently running 78s and 6.5 power valve in Primaries, 91s w/plugged power valve in Secondaries.
Sea level
Does this jetting sound about right for the dual plane?
THANKS!
#2
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I know this is a sacrilege but I am going to detune the 500HP clone in my 22 Classic Donzi to make her more manageable around the marina.
502, 9.5/1, Dart heads, Gil exhaust (Long risers), Crane HP500 cam retarded to 111* ATDC
Currently running a HP500 World Products single plane high rise.
Going to a GM dual plane aluminum high rise.
Currently running 78s and 6.5 power valve in Primaries, 91s w/plugged power valve in Secondaries.
Sea level
Does this jetting sound about right for the dual plane?
THANKS!
502, 9.5/1, Dart heads, Gil exhaust (Long risers), Crane HP500 cam retarded to 111* ATDC
Currently running a HP500 World Products single plane high rise.
Going to a GM dual plane aluminum high rise.
Currently running 78s and 6.5 power valve in Primaries, 91s w/plugged power valve in Secondaries.
Sea level
Does this jetting sound about right for the dual plane?
THANKS!
#3
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What sre you having problems ‘around the dock’ with, specifically ? Maybe just a carb or ignition issue ? I know the non marine 830’s can be pain in azz to tune for some reason. Marine 800’s like that came on hp500’s are straightforward. Once those are fixed/tuned correctly Can even mellow idle out more between shifts with a Daytona Sensors box probably.
#6
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i assume your talking gms copy of a edelbrock performer rpm intake, if so, thats a GREAT intake for a 502, you'll see a 20 to 40 or MORE foot lb of tq increase in usable powerband at the sacrifice of 5 to 8 hp from 5500 to 6000 that most boaters never even reach. I discourage my customers from ever single planes on 502s and smaller unless they want to pump compression to octane limit, put a huge cam in that also sacrifices tq and spin it 6k, Smitty
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#8
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What sre you having problems ‘around the dock’ with, specifically ? Maybe just a carb or ignition issue ? I know the non marine 830’s can be pain in azz to tune for some reason. Marine 800’s like that came on hp500’s are straightforward. Once those are fixed/tuned correctly Can even mellow idle out more between shifts with a Daytona Sensors box probably.
i assume your talking gms copy of a edelbrock performer rpm intake, if so, thats a GREAT intake for a 502, you'll see a 20 to 40 or MORE foot lb of tq increase in usable powerband at the sacrifice of 5 to 8 hp from 5500 to 6000 that most boaters never even reach. I discourage my customers from ever single planes on 502s and smaller unless they want to pump compression to octane limit, put a huge cam in that also sacrifices tq and spin it 6k, Smitty
THANKS, for the help guys!
Last edited by RickR; 06-22-2022 at 07:54 AM.
#9
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Idle too high or she loads up. I will look into Daytona Sensors
Plan on keeping it.
Yes, similar intake. 5800 RPM motor but usually prop for 5600. PLENTY of torque for a 3800# boat. I don't mind a little off the top end if it will keep people from shaking their fist at me in the marina
THANKS, for the help guys!