converting non-reference carbs to referenced

[Larry J]

Just wondering if anyone has done this themselves, I just put a weiand blower on my small block chevy and have a 80537 750cfm holley
carb and would like it to be manifold referenced
since most of my time spent boating is in midrange
and do not want to run lean, any other suggestions
on set up would be great, thanks in advance
:D

[Blown 472]

Larry J:
Just wondering if anyone has done this themselves, I just put a weiand blower on my small block chevy and have a 80537 750cfm holley
carb and would like it to be manifold referenced
since most of my time spent boating is in midrange
and do not want to run lean, any other suggestions
on set up would be great, thanks in advance
:D Got a fax number?? I will send you what holley sent me.

[Larry J]

No fax until Monday at work, do you have a scanner
and e-mail that to me, I will post it if you need
to, May go out on sumday for some testing if nice
Need to be tuned in by Memorial weekend
Thanks

[Infomaniac]

Put a vacuum gage on it and read the vacuum at your fastest cruise speed and wide open. If the vacuum is not more than your powervalve do not worry about it.

[Larry J]

ok, so I am new to holley carbs and supercharging
if my stock power valve has a 3 and 5 on it, does
that mean it closes or opens and 3.5 inches of vacuum, and should I put a different power valve
in to start, maybe a 6.5 or so to make sure that
it does not go lean as I do not plan on a motor until this coming winter, any more advise on jetting or powervalve size would be appreciated,
thanks again

[Unchained]

Infomaniac:
Put a vacuum gage on it and read the vacuum at your fastest cruise speed and wide open. If the vacuum is not more than your powervalve do not worry about it. Ron, I was going to say the same thing but I'm afraid the advise falls on deaf ears.
From what I read here some guys want the power valve open at normal cruise speed. :rolleyes:
I would be willing to bet that only 1 in 100 blower engines really need boost referencing and it would be a band aid for a poor setup.
It would have to be an application with a large blower and a small carburator to pull enough vaccuum at the carb base at WOT to let the power valve close.
Mark
[ May 05, 2003, 04:46 AM: Message edited by: Unchained ]

[Infomaniac]

Larry J:
ok, so I am new to holley carbs and supercharging
if my stock power valve has a 3 and 5 on it, does
that mean it closes or opens and 3.5 inches of vacuum, and should I put a different power valve
in to start, maybe a 6.5 or so to make sure that
it does not go lean as I do not plan on a motor until this coming winter, any more advise on jetting or powervalve size would be appreciated,
thanks again It requires 3.5 IN/HG to keep it CLOSED. As long as you have less vacuum than that at cruise and wide open, the valve will be open. Like Unchained said, you may or may not need it open at cruise. It needs to be open at wide open throttle for sure.
A 3.5 would be a number that might be suck shut. It is a very low number.
[ May 05, 2003, 06:49 AM: Message edited by: Infomaniac ]

[disco_charger]

I was told that boost referencing was not a band aid, rather a safety precaution. I have a engine set up by Mert Littlefield, and it's boost referenced. I trust in Mert...