I ran a sim using the "low perf/pocket port" head selection, dual plane intake with 600cfm flow, small headers w/ mufflers, and entered the cam specs from a Comp High Energy, 212/212 @ .050 with .440" lift.

The unknowns are, first, you can't get the cam profile exactly right by just entering duration and lift specs, so that could be a little off. Even so, I set the sim for a hydraulic lifter, so it's supposed to simulate a mild cam.

Also, the cylinder head selection may not be accurate. I was going for a Vortec head sim, so I set the compression at 8:1, and used the "low perf/ported" profile to hopefully get in the ballpark.

The power curve hits a max at 5000 rpm, and falls off at 5500.

Anyway, I ran this engine through Desktop Drag and used the system's existing specs of a 95 Camaro with a 5-speed. (which should be relatively close to a 3rd gen). Assuming you can get traction dumping the clutch at 2000 , the run was a 13.86 with a 2.23 60ft (using a 6" rollout).

Does all this sound reasonable based on your experience or other guys you know that built up a 305?

 

i wouldn't trust or beleive any of the more common simulator programs

 

Unfortunately those programs are really only as smart as their programmers. You are relying on the knowledge of a bunch of bench racing programmers. A 13.8 is possible with that combo; however that's saying everything is in your favour. Basically I am trying to say: you have to build it and find out for yourself.

Also note: there should be data files you can open with cylinder head flow numbers and the L31's should be in the list; or else you can manually enter the flow numbers in the flow chart.

 

i'd say that time is possible, but more likely a 14.2 area.

 

I realize that the results are just a stack of guesstimations (some of them my own) but I usually try to err on the conservative side.

The drag program, however, probably assumes a more optimized set up than real world conditions, including foot to the floor powershifts. I did set the shift time to half a second though, which seems reasonable unless you hate the car! The launch is a question mark, but getting traction off a only 2000 rpm clutch drop doesn't sound hard. The 2.23 60ft is common enough for street tires.

But, like Zippy said, it may be that low 14s are more likely, especially with my fairly conservative drag technique.

 

If there's one thing I learned from using the DragStrip program, it's not to trust it.

Actually, it's OK once you get a real number to work with.

I took actual 1/4 runs, entered them into that program, and the ONLY way I could get it to match was to build a 305 that matched the SAE ratings.

I ran a 16.534 @ 82.7 MPH and what you see here is the closest I could get.

One thing I don't understand is the 60' times. I know darn well mine weren't THAT bad. I had 100% traction, and the program shows 100% traction. That part has me puzzled

 

It looks like your rollout distance is set to "zero". (or maybe it's "8", can't tell, it's fuzzy! lol)

Rollout makes a big difference, both in the program, and in real life. I tried a G-tech, and my 60fts with no rollout were a full half second or more slower than at the dragstrip. It makes a similar difference in the software simulation also.

 

Rollout is 8.00"

You need a new monitor or new glasses.