454 Oval Port Dyno/Drag Test

[HP HUNTER]

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.

[HP HUNTER]

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

[Mike Gray]

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

[HP HUNTER]

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.

[Glenn Briglio]

Originally Posted by HP HUNTER

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

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

[Gary Evans]

Originally Posted by HP HUNTER

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.

Under those conditions, 10.35-10.40

[HP HUNTER]

Originally Posted by Glenn Briglio

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

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.

[HP HUNTER]

Originally Posted by Gary Evans

Under those conditions, 10.35-10.40

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

[HP HUNTER]

Looks innocent.......

[goinbroke2]

Originally Posted by Glenn Briglio

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

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.