454 Oval Port Dyno/Drag Test
 

I put together a 4.310 x 4.00 BBC 467 Cu In, 10.3 compression, 781 oval port heads, 1.88/2.190 valves, Performer RPM air gap intake, 4150 carb with a 1 inch open spacer. Hyd roller cam 238/248/.578/.608/110, 1.7 rocker ratio. My goal is a 9 sec pass in my Chevelle. Here's some pictures of the build.

Re: 454 Oval Port Dyno/Drag Test
 

This combination produced this power @ 900 feet elevation, 29.27 barometer, 84 degrees, 30% humidity, 2500 DA.

Re: 454 Oval Port Dyno/Drag Test
 

9 sec. Run may depend on the weight of the car.

Re: 454 Oval Port Dyno/Drag Test
 

My car weighs 3500 pounds race ready, but I do have a weight box, probably be in 2800 DA conditions for the test which is coming this weekend, this is a expedited dyno/drag test.

Re: 454 Oval Port Dyno/Drag Test
 

Did you run the engine to a higher rpm to see when it falls off ?

Re: 454 Oval Port Dyno/Drag Test
 

Under those conditions, 10.35-10.40

Re: 454 Oval Port Dyno/Drag Test
 

Excellent question, no I didn't but we both know it going to have to go 7000 RPM at the line, and I've run that valve train that high before in a 496 before. BTW I'am a BIG fan of the work you do with your Camaro! I'am thinking you've noticed my dyno data other have not. Here's a simulation of a 496 with the same cam and valve train.

Re: 454 Oval Port Dyno/Drag Test
 

Thanks for the input, Tx conditions are horrible due to the GOW, its not very often we get excellent conditions, maybe one race a year. This is what I think I will have to work with this weekend. When I lived in Colorado it was always about the baro, when I moved to Tx its always about the humidity, the killer of HP.

80 degrees
78 Humidity
120 GOW
29.5 Baro
2400-2800 DA
475 Elevation

Re: 454 Oval Port Dyno/Drag Test
 

Looks innocent.......

Re: 454 Oval Port Dyno/Drag Test
 

That's what I was thinking, climbing slowly so only another hp or two at 6500, so, 606hp, maybe holding to 6700 but I don't see any jumps in power above 6500rpm.

Re: 454 Oval Port Dyno/Drag Test
 

Your so correct on the humidity killing horsepower. We do get mind shaft conditions in March and around November LOL. Hard to burn all that moisture, great build and information.

Re: 454 Oval Port Dyno/Drag Test
 

Thanks, You get mineshaft air in Houston, we are at 475 feet elevation, I have yet to see mineshaft air in Tx, never seen a 30.0+ baro yet to this point where I'm at. I'm going to Extreme Sunday, so we're going to know what I got here. Of course the day I dyno tested this engine the humidity was 30%, I wanted wet conditions for my dyno testing because that's always what I get at the track. Any predictions.......anyone.

BTW the quickest and fastest I've ever run was @ Houston! 600 DA 30.0 baro

Re: 454 Oval Port Dyno/Drag Test
 

Its done @ 6400 RPM, but it will hang on to 7000 RPM.

Re: 454 Oval Port Dyno/Drag Test
 

Test is done.

80+ degrees
70% humidity
59 GOW
29.30s baro
459 track elevation
15 MPH strait on head wind


1.33 60 foot
4.01 330
6.31 660 (3 in a row)
106.29 MPH
3490-3500 pounds

Re: 454 Oval Port Dyno/Drag Test
 

Thanks so much for the simulation! And I knew this was going to be the results when I couldn't get into the 6.20s, I saw the 6.31 on the board from the driver seat on the first pass and I knew I was in trouble, then another 6.31 on the second pass, we then dry iced the intake as it was heat soaked, but ice got mixed in with the dry ice, and of course the water came, we tried to pick out the ice and run it, after the burnout they shut us down, it was heart breaking, we went back to the pits and cleaned up the mess, by this time there was no more dry ice, as we got the intake cleaned up the heat came right back into the intake, a horrible mistake was made that day and it cost me the 9s, we made a final pass, of course the power adder freaks were out and in the lane next to me, I went into the beam first and waited for the power adder, he finally lit both bulbs, I rolled in, but to slow for the starter, he red lit me, I ran through no time due to the red light, But we had the draggy in the car and it read 6.31.........................

By this time I've had enough, 200 mile drive home, to late to make the road house, screwed again in the TX conditions, but the best part of this whole thing is your simulation, thanks so much!
Thanks to Larry Meaux for the simulations!

Re: 454 Oval Port Dyno/Drag Test
 

Three 6.31's....I know you want more but I'd be happy to bracket race that!! (of course, then my bad lights are more obvious when I have a bad package) LOL

Re: 454 Oval Port Dyno/Drag Test
 

What kind of exhaust. It?s a nice well working car I see.

Re: 454 Oval Port Dyno/Drag Test
 

Thanks, 2 inch Hooker with 8 inch extensions.

Re: 454 Oval Port Dyno/Drag Test
 

NEW BEST

60 foot 1.31
330 foot. 3.97
660 foot 6.29