Larry, Mine is an 850cfm downleg boosters(talk to 5 different Holley or Grant tech guys and they all seem to disagree which booster and size is the best for a heavy car with my motor).They changed the names(Speed Demon, Road Demon??) now but is is the one around $450. Not the high dollar one with changeable sleeves and boosters. I think I look at it as too many variables(bleeds, boosters) are too many things I can screw up! Maybe if you know what you are doing on the dyno with a BSFC measurment you can really dial it in
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It was almost right on out of the box. Idles great. Ran faster than my 800+ cfm Carb Shop prepped Q jet even using an adapter plate to put in on the HO intake.I did have to add secondary jet extensions and fatten it up 2 jet sizes.When running no air cleaner and open headers. That lean pop doing a dry hop at night out the scoop got my attention!No choke on mine but it seems to run OK without it.
I love the glass sight for the level on the side so I don't have to get gas all over. Those clear Moroso ones on my Holley's would get cloudy to quick
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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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