Carb Question

agro1 · #1 (**permalink**) 10-18-2002, 10:51 AM

My 351W (427 stroker) has a Holley 750 on it and I was thinking of going bigger - Any thought ? Would a bigger, say an 850cfm, make that much of difference and any noticable hp increase ? Thanks in advance.

hound dog · #2 (**permalink**) 10-18-2002, 10:58 AM

According to Dyno 2000, about 6 more horsepower using my engine configuration (393) with victor jr. heads, intake, and Lunati roller and then uping the cubes to 427. Unless you have another reason for upgrading, not really worth it.
h dog

agro1 · #3 (**permalink**) 10-18-2002, 10:59 AM

Nice - thanks Dog....

mkcobra · #4 (**permalink**) 10-21-2002, 07:24 PM

you could gain even more HP for free if you havent run the car on a Dyno and turned your Air Fuel mixture. even just a few degrees of timing out can cut HP by 10 or so. I would reccomend you try tuning the 750 most would say if its a HP version carb should be good to 500-550 depending on you rev limits.

Mr.Fixit · #5 (**permalink**) 10-22-2002, 07:27 AM

You should pick upo a little HP on the top end, with the sacrifice coming from bottom end throttle response. All the stroker small bocks that make close to 500 hp, I put 850 double pump holleys with downleg boosters on them. It's realy six of one, half dozen of another. I bet you wouldn't really feel any noticable difference either way, unless your current carb is far off the tune. Spend that money on more gas.

agro1 · #6 (**permalink**) 10-22-2002, 10:12 AM

Fixit - your right...On the chassis dyno it did fine, well over 500hp at the flywheel which is plenty (for now)...and running my compression I need to save all the $$ I can for 100 octane...