the right carb?

[Rhinolined360]

470 truck avenger lmao I would go with the 670 truck avenger no lower than that! come on!!!!!!!!!!!!!!!!

[zero cool]

470 truck avenger lmao I would go with the 670 truck avenger no lower than that! come on!!!!!!!!!!!!!!!!

It's a 304...

I ran a 670 on my 360 and I'd recommend a 770 for a well built 401. But for a 304, the 670 is overkill. You'd have to down tune the 670 so much that you would hardly ever get into your secondaries. And at that point, you may as well just toss a MC2150 2bbl on it.

A 304, unless you're running at 5K RPMs or more on a regular basis, will run great with a 470.

[dbesade]

470 truck avenger lmao I would go with the 670 truck avenger no lower than that! come on!!!!!!!!!!!!!!!!

It's a 304...

I ran a 670 on my 360 and I'd recommend a 770 for a well built 401. But for a 304, the 670 is overkill. You'd have to down tune the 670 so much that you would hardly ever get into your secondaries. And at that point, you may as well just toss a MC2150 2bbl on it.

A 304, unless you're running at 5K RPMs or more on a regular basis, will run great with a 470.

Just a note that the 304's came with the 1.07 venturi MC2100.. the MC2150 isn't all the much bigger than the MC2100, with a performer intake, the MC2100 will cause cause a performance hit rather than just going with a decent 4 BBl

-Dave

[jeepsr4ever]

Do your carb math and then add 30% to your required CFM and you have the perfect CFM requirement for your engine.

[Mudrat]

To help dummies like me .... an on-line Calculator

Or simply, a 360 that's .030 over needs, with NO OTHER MODS, ~581 CFM with a 100% VE (volumetric efficiency) and a top end of 5500 rpm. But who's perfect? At 90% VE that same engine only needs 465 CFM, or with MCs math - it works out to 605 CFM.

So the lesson for today class, polish ur heads, clean-up the intake and exhaust flow paths, go bigger on the bump-stick and let that puppy breathe!!



VE = Volumetric efficiency in internal combustion engine design refers to the efficiency with which the engine can move the charge into and out of the cylinders. More correctly, volumetric efficiency is a ratio (or percentage) of what volume of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions. Therefore, those engines that can create higher induction manifold pressures - above ambient - will have efficiencies greater than 100% (blowers, etc...). Volumetric efficiencies can be improved in a number of ways, but most notably the size of the valve openings compared to the volume of the cylinder and streamlining the ports. Engines with higher volumetric efficiency will generally be able to run at higher RPM and produce more overall power due to less parasitic power loss moving air in and out of the engine.
-Wikipedia®

[Rhinolined360]

I used the holley carb selector for the 304 http://www.holley.com/applications/C...bSelection.asp
it came out to the 470cfm lol that sucks

[Mudrat]

I used the holley carb selector for the 304 http://www.holley.com/applications/C...bSelection.asp it came out to the 470cfm lol that sucks

Well by straght numbers that would work, but AMC engines like to breathe easy - thus MC's 30%-over rule. I kinda went small myself, I have 600 CFM sitting on a built 360 - shoulda gone 750 (758 CFM at 100% VE) probably

Oh, well. Live and learn

[ironman_gq]

will a 500 be large enough I dont plan on revving past 5500 and would really like to keep most of the power down around 1000-3000rpm

[dbesade]

will a 500 be large enough I dont plan on revving past 5500 and would really like to keep most of the power down around 1000-3000rpm

I have a Performer 1406 (600CFM) from from the bulltear store.. works very well on my 304 and I even got 17-20 MPG on the road pouncing around town..

-Dave

[Mudrat]

I have a Performer 1406 (600CFM) from from the bulltear store.. works very well on my 304 and I even got 17-20 MPG on the road pouncing around town..

-Dave

That's 'cause you have a light foot Dave . . . NOT!!!

The only thing more scary than riding with Dave on-road was riding with MC off-road in the Green Machine we stole at the FJOA Scramble

By the way Frank - GREASE is STILL your friend