carb sizes?
Thread Starter
|
Posting Guru
Joined: Jan 2005
Posts: 1,051
Likes: 0
From: Douglas, Georgia
carb sizes?
At the moment I have a stock 302. Within the next year, intake/cam and heads will be on the upgrade list.
Within 2 years I'll have a stroker kit in the engine.
A guy locally has a speed demon 650cfm carb he's selling dirt cheap, it's a rebuilt unit and he needs the cash.
I feel this is too large for the stock 302 and on the edge when stroked. Should I grab it up, or will it hurt the stock engine performance too much?
thanks,
Drew
Within 2 years I'll have a stroker kit in the engine.
A guy locally has a speed demon 650cfm carb he's selling dirt cheap, it's a rebuilt unit and he needs the cash.
I feel this is too large for the stock 302 and on the edge when stroked. Should I grab it up, or will it hurt the stock engine performance too much?
thanks,
Drew
Senior User
Joined: Jan 2008
Posts: 301
Likes: 0
i put a holley 670 avenger on a stock 302 in a maverick only other mods it had was a action- plus intake and a dual exhaust with flowmaster connected to manifolds not headers and it ran very well,,but make sue its a vacum sec. carb ,,hope this helps
Elder User
Joined: Oct 2005
Posts: 677
Likes: 0
I think a 650 would be a good choice if the price is right.... just make sure if has vas secondaries if you are doing offroading.... double pumpers suck offroad if you want throttle control.... like pipman76 says.
My experience with carbs is a 650 will work okay with a stock 302 as long as you adjust the jetting, and depending on what rmps intend on operating that stroker, might be a great carb for it as well. Carb selection is more a function of rpms then engine size..... holley's website has a carb calculator, and it will give you a good idea of what is recommended.
My experience with carbs is a 650 will work okay with a stock 302 as long as you adjust the jetting, and depending on what rmps intend on operating that stroker, might be a great carb for it as well. Carb selection is more a function of rpms then engine size..... holley's website has a carb calculator, and it will give you a good idea of what is recommended.
Posting Guru
Joined: Oct 2009
Posts: 2,066
Likes: 4
From: Rogue River, Oregon
I know there's world of difference between street an dirt, but I run a pair of Holley 390 cfm carbs on my Mustang and it runs better than any 600 cfm carb I've ever run. I use straight linkage, meaning both carbs work at the same time, and throttle response is instantaneous, mileage is acceptable (13mpg) and aside from a slightly worse idle, there are no drawbacks. Now keep in mind that although 390+390= 780, with vacuum secondary carbs, it doesn't mean that I have 780cfm on my 302. Vacuum secandaries need engine vacuum to open to capacity, and while my motor screams on top, I doubt that the secondaries are fully opening, but the motor is still getting all it needs, as the plugs look tan and dry.
But I think the most important things in carb selection for a small block Ford are to get vacuum secondaries, a generous accel pump shot and GOOD ignition. Even the perfect carb is worthless with weak ignition.
But I think the most important things in carb selection for a small block Ford are to get vacuum secondaries, a generous accel pump shot and GOOD ignition. Even the perfect carb is worthless with weak ignition.
Thread
Thread Starter
Forum
Replies
Last Post
9228.bobcat
6.0L Power Stroke Diesel
4
Nov 30, 2013 08:27 PM
