I am building a 400sbc with a 248deg duration .555 in. lift solid roller cam(too big?), 5.7 in. rods, 64cc 2.05/1.60 Dart heads, around 10:1 CR, flattop pistons, and my question is which induction system should i use? Miniram, superram ,or something else?
I will use nitrous and possibly eventually supercharge.

This is all going in an '89 RS auto t-tops.
Also, six speed or auto? I kinda want an auto but i like six speeds also.

Any help will be appreciated.
Thanks.

 

If you dont have to pass smog, get the miniram. If you do have smog checks, get the superram.

6-speeds are a lot of fun, if you have the money, go for it. If you drag race a lot, automatics are more consistant and easier to launch.

------------------
West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Ryan,

That is a cam which is designed to make power to 7000 RPM. This is Miniram territory for sure. In addition, a cam like that will require some really fancy tuning, perhaps even an aftermarket ECM like Accel DFI, or FP Performance.

Note that you are forecasting flat-top pistons and 64cc heads. If you do the match, you'll rapidly find that your compression ratio is going to be 11.25:1 or greater, depending on which head gasket you use, and how far down the hole your piston sits. This will effectively preclude you from any effective supercharging application. Nitrous?

With a cam like that, and those cubes, you will want to make sure that the heads beathe. Are these DART heads displacing 200cc or greater on the intake tract? They better. You are going to need the air in order to make power.

In addition, if you decide to use an automatic, make sure you buy a really good quality torque converter with an estimated stall speed of 4000 RPM. Since this is going to be a drag-strip type of engine, you'll want the automatic, with a converter that can lock up at WOT in third and fourth gear. Rear gearing? You'll want 3.42's. Any higher and you'll be topping out in the quarter mile.

Don't forget, an engine with that kind of cam will probably push 550+ HP, with the right heads & tuning. This will most probably spell DOOM for your 10-bolt. This means you should begin planning for a $1500 conversion to a Moser 12-bolt assembly soon.

Here's an idea, scale back your cam. Pick something like the CC306 profile which (I think from memory) is somewhere around 114 LSA, 236/242 degree cam with about .540" of lift. You'll still power to 6000 RPM, but you'll have better low-end torque, idle quality, vacuum signal, and a butt-load of launch velocity when the engine hits 3000 RPM.

FWIW, I have a custom hyd roller cam that I recently purchased which was installed in a minirammed 383. The motor saw only three trips down the strip, all of which were supposedly 11.70's at 121 MPH, with traction problems. This is a 230/236 dur. 112 LSA cam.

BTW, Hi Kevin, Let's do lunch sometime, Hmmm???



------------------
Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

 

Hi Dan, are you planning on coming to California some time soon? Lunch would be tough if you're not, hehe.

 

your motor combo is close to mine
i use a super ram.

check out my simple page at:
http://darcom.home.texas.net/

 

Why not look into the Weiand 9901-101-1 intake???

Single plane, setup for fuel injection, has a holley bolt pattern.

Get the Lignefelter elbow, and a twin 58mm throttle body...

I am going to the track on the 14th of April..... I'll let you guys know how the setup does....

------------------
Sportsman II 72 CC heads, Pete Jackson gear drive, Performance Resources chip, Edelbrock 1 5/8" headers and Edelbrock cat back exhaust, hi-flow cats, Trans-go stage 3 shift kit, Vigilante 9.5" 2800 stall convertor, SLP cold air induction, SLP roller camshaft, 24lb ADS injectors, AFPR, 3.45 rear end gears, and other goodies...


raven