Single or Dual plane?

-
6

66dartman

Well-Known Member
Joined
Apr 25, 2005
Messages
1,164
Reaction score
11
Location
Littleton, CO
For my 408, which will be 11.9 compression, eddy heads, 244/252@.050 solid with 540 lift,
3.91 gears, 3000 converter and 750 mech sec. I am aiming for 6000-6200 trap rpm and about 450 hp @ 5800' altitude. The rpm air gap works well on the 360 and 318 engines I have had in this car, I am aiming for 11's up here in the stratosphere with the 408.
 
Stay with the RPM, The torque will help with the gear and converter, IF.... thats an if you gain any horsepower, it will not be worth the torque loss.
 
A lot of the 408 and 416's use the air gap and make big power. Probably because it works in the lower RPM range that the strokers like. What RPM range is the 244/252 cam spec'd for? If it's 6500 or below try the Air Gap.
 
I think the DP is the better choice for what you're doing and the cam you have but the M1 SP is a very good piece too. The carb will be more of a limit than the intake IMO.
 
I will echo everyone else and say to stick with the dual plane as well.
yes lower rpm is where the average strokers do most 6-6500 and below.

plus more swept volume likes longer runners go's along with what I just said above

once you move the cam out of the range of a dual plane [really big cam] then the single will show more, relitive to what rpm you drive/race in is where you want the power to be.
 
If you want it to turn off like a switch under 3K go with a single plane.
 
StrokerScamp said:
If you want it to turn off like a switch under 3K go with a single plane.
Click to expand...

Ha ha ha ha, that's funny, but has alotta truth to it.

Moper M1 single would be the best single for it if you run a plastic fantasic with it.
 
The dual plane if its an air gap could be an issue for you in cold weather. When I visited Colorado years ago it snowed on September 1st. I don't know what the average winter temp is there but the car my take a long time to warm up with an air gap at the same time leaving a lot of raw fuel to wash the cylinder walls down. Depending on how much you drive the car and if you fully warm it up every time you drive it this may not be much of an issue if you are prepared to change the oil very frequently.
 
Thanks guys. I will stick with the air gap for now. One of the guys I race with has a 408 with a super victor on it and it runs 12.30's, which is where my 360 ran. I hope to make use of the 4" stroke's low end torque and use less rpm to get the 11's I'm looking for.
 
You must log in or register to reply here.
-

Back
Top