Don't know about your speed shop guy, but the first problem that he, & your
dyno friend did not identify was that you installed too big a carb, a common
problem within the hot rod fraternity. A 500 cfm Edelbrock or Carter would
have been almost perfect for your engine. The 600 is really too large,
better suited to a 350 Chevy.
I am running a 500 cfm Edelbrock on 302 CI of Buick with much larger valves
& a heavily ported set of heads & it gives all the performance you could
hope for. Easy starting, good idle, & plenty of go.
Bigger carbs reduce air/fuel velocity & performance. Rule of thumb is 100
cfm per liter of displacement. Of course this is a starting point, affected
by compression, heads, cam, etc.
Jim Stuart
-----Original Message-----
From: owner-mgb-v8@autox.team.net [mailto:owner-mgb-v8@autox.team.net]On
Behalf Of T. S. White
Sent: Saturday, December 06, 2003 10:00 AM
To: James Nazarian
Cc: v8
Subject: Re: some observations
I thought I would toss in my experience on the carb and HTOB. I have a
289 in my TR3A. At the suggestion of a friend and a dyno tuner I
installed an Edlebroch AFB 600 CFM. I then had the engine dynotuned.
The result was entirely disappointing. The carbs only redeeming quality
was that it idled well. At a car show I spoke to a speed shop guy that
divuldged that the AFB has a generic fuel curve that doesn't fit any
engine well. I have since switched to a Holley Street Avenger with much
better performance characteristics.
I called Howe before installing my HTOB. The technitian there actually
recommended setting it up with a little slack.
--
Best Regards,
Tom
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