Help me identify a holley tbi unit
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Joined: Jul 2001
Posts: 212
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From: Christiansburg, VA
Car: 1992 Camaro RS
Engine: 355
Transmission: T56
Axle/Gears: 3.73:1
Help me identify a holley tbi unit
Hello,
I purchased a holley TBI from ebay (950-24S) which is supposed to be a 900cfm with 75pph injectors. However, I suspect it's a 700cfm with 65pph injectors. Is there a way to identify which unit I have?
Notes:
1.5" throttle bores
Injectors have a yellow ring
Injectors have 4247 and 5717 stamped on them
Thanks for the help!
I purchased a holley TBI from ebay (950-24S) which is supposed to be a 900cfm with 75pph injectors. However, I suspect it's a 700cfm with 65pph injectors. Is there a way to identify which unit I have?
Notes:
1.5" throttle bores
Injectors have a yellow ring
Injectors have 4247 and 5717 stamped on them
Thanks for the help!
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Re: Help me identify a holley tbi unit
Holley used to color code the injectors (yellow ring). However, I don't recall what the flow is.
If the bores are truly 1.5", then it is a 2.8l or 3.1l TBI unit.
The 4.3l, 5.0l, & 5.7l TBI units have 1-11/16" bores (stock GM). And flow about 500 CFM @ 1.5" Hg
The 7.4l units have either 48mm or 2" bores, not quite sure on the stock ones. And flow about 650 CFM @ 1.5" Hg
RBob.
If the bores are truly 1.5", then it is a 2.8l or 3.1l TBI unit.
The 4.3l, 5.0l, & 5.7l TBI units have 1-11/16" bores (stock GM). And flow about 500 CFM @ 1.5" Hg
The 7.4l units have either 48mm or 2" bores, not quite sure on the stock ones. And flow about 650 CFM @ 1.5" Hg
RBob.
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