At only 7,200 rpm. you really aren't getting into where a finely tuned header will make that much difference. I would build a nice set of 2-1/4 to 2-1/2 step. You could even do like funny car double wall to keep the heat out of the car. You can make 240mph with a 2.95 rear ratio, (tranny 1.00 I presume) 33" tire, according to Wallace. Doesn't the car weigh more than 4,000 lbs.? At your level of play, drag coefficient is really where it's at. More hp on the salt will create more tire spin if it's fighting a brick wall.

Ran your numbers again with(394 flow)= 111.24 VE and 8000rpm.
1071hp/765tq calling for a 2.182-2.307" tube 25.9-28.9 long.
HP/CI=2.51

Hey Dave, does the program show the same numbers if you change the rpm to 8000 or 8500? Might need to turn the pump faster to make hp. Thanks

Hey guys,thanks for all the feedback, I really appreciate it. I've decided to go with a two-step 2 1/4" to 2 3/8" with a 4" collector. The AlterKtion (to get rid of torsion bars and free space for the dry sump pump) should arrive next week, so I can get going on the headers. I hope to get the headers and dry sump together and stop by Best Machine on the way home to hear this beast sing! Then we'll know what it makes! Today is day 17 of the build, I've replaced inner and outer rockers, trans crossmember, and all four frame rails so far. Floor is obviously still out, and I got one wheelhouse out today with fresh one mocked in place. Finally getting something done on it! Thanks again!

What car year and body style are you going to run on the salt flats?

OK, using 8500rpm target with same 111.24 VE/394 flow gets you 2.236-2.361 tube size 25.2-28.2 length. Collector length 13.8 or 6.9. Collector Dia 4.204-4.704 AVG HP 1156/769 TQ, HP/CI 2.321

I'm going to guess 1080-1100HP@8200RPM.

I run 2 1/4 to 2 3/8s with a 4 inch merge collector on my 632 600-13 xxx headed motor

Hey Cab, I'm planning to make Speed Week in August, touch base with me before to confirm. Definitely something a car guy should do before he pops the 'chute!

I'd certainly be happy with that Tom!

Hey Dave, can you hang that 8500rpm data or send it to me? I would like to se ethe rest of the numbers. It looked like you were describing a two step header, thanks.

440GTX, what power and torque is that monster making?

here ya go

1240 hp and 920 ft pounds of torque

SHOW OFF!!


I was going to respond to this, but im not LOL

Hey Cab, building a 1969 Daytona clone for the task. I'm in Buckley, WA, come on up and have a look!

That's certainly stout 440GTX, thanks. How did you determine what type merge collector to go with, or did you just pick what you wanted? Do you have comparison with non-merge collectors by chance?

I always run a merge chuck from best machine helped me with the tubing size and talked to couple of other guy pretty much came up with the same thing

Thanks again Dave!