Holley/Demon Carb stumble
I was looking through some dyno sheets.......
I have one sheet with a 410, mild solid roller, rpm heads, Victor intake, QF-850 carb.
524tq/538hp....... it’s still quite rich.
I don’t know exactly which QF 850 was used( I do know it wasn’t the SS-850), but on this run the jetting was 74/85.
No air bleed info.
I didn’t run this motor, but it’s richer than I would have preferred it, and I’m sure there was a little power left on the table.
That carb, with those jets, on that motor......... used a TON of fuel...... and the bsfc numbers were not very good.
So....... I’d say it’s going to be pretty easy to get one of these too rich.
Also, if you rewatch that video I posted, the the Holley Brawler ended up with fairly small jets in it(70/80)on that combo.
Granted it’s only 750, but the venturi diameter is very close, so I wouldn’t be expecting a big difference in the jetting requirement.
Like I said, with 74/85 on the 850 here, it was still quite rich.