volumetric efficiency

Hey guys I'm trying to figure out what size carb I need. I've got a 73 429 with d3've heads. I plan on porting the heads and the motor only has a 600cfm carb on it now. I am trying to use a calculator to figure out what size carb need but I don't understand the volumetric efficiency. Can someone help me out with this?

Figuring 6500 for a peak RPM, 429 cu in, a great carb for it would be the holley 950cfm. It would provide high end performance and yet have great street tunable manors.

It's just gonna be an around town/on the weekends truck but I would still like it to get up and go quick. Probably won't see anything over 5K rpm. Probably mainly from idle to 4000. I'm pulling everything out now so I'm still trying to piece together a good build. I'm thinking along with the head porting I'll be putting on a dual plane intake, distributor and ignition, larger valves, milled heads, flat top pistons, a somewhat mild cam, and headers. I think that's all. Until I think of something else. Lol

With the id of parameters.   A 750 would be fine.

What gear ratio/tire size and transmission/torque convertor are you going to use? Any idea on cam specs yet?

It's got 4.10 gears in it and I am clueless when it comes to cam parameters. I am still reading into the different lift, duration and other stuff that is involved in choosing a cam. As far as the tranny goes its a C6 I'm going to have a mild shift kit installed and probably just a 1500 stall.

I think you will find a 429 built the way you describe will want to rev past 5K RPM's pretty quickly, at least mine did. A 750cfm will work well, esp above 5,000 rpm. If you are really going to stay at 5k rpm or below, I don't think you will notice much difference than with a 600cfm carb on the top end, and it will be less crisp at lower rpm's.

750 ftw

Use the carb you've got.

What is the red line on a stock rotating assembly and heads?

mxer0022 wrote:What is the red line on a stock rotating assembly and heads?

my 460 I turned it 6500 with no problems with a stock bottom end the heads will depend on how they are setup I checked the bottom end few time while I ran it in my truck bearings always like fine. it made just a little over 500hp

69F100 wrote:

mxer0022 wrote:What is the red line on a stock rotating assembly and heads?

my 460 I turned it 6500 with no problems with a stock bottom end the heads will depend on how they are setup I checked the bottom end few time while I ran it in my truck bearings always like fine. it made just a little over 500hp

^^^^ the safe max RPM of the rotating assembly, and the redline of a given engine will be different, depending on the sum of the parts, the redline for the given engine will be before valve-float occurs. If you plan the redline of the engine at or below the max of the rotating assembly you will inherently increase the longevity of the engine although you can exceed it substantially (for a given time).

dfree383 wrote:

mxer0022 wrote:What is the red line on a stock rotating assembly and heads?

What kind of shape is it in? 40yo engine with unknown time and condition?

Oh it won't be stock. It's gonna be getting a full rebuild. Bottom, top and heads. Thanks for all help guys. I will be taking pics of the build as I go. I'll post up a new thread with pics of the build.