Wishmaster

if I switch to 1.6 rockers..with my cam..what will that make the duration/lift? does that change much and will it affect much?

YenkoST

1.6 rockers compared to 1.5 rockers will add .030 of lift(approx) and as far as duration...it adds about 2 degrees to both intake/exhaust if you put 1.6 rockers on both.

Wishmaster

I told him that may use NO on this motor but forgot to ask if the cam will be ok for that...will it? or do cams have to be spec'd out for nitrous use?

YenkoST

Usually NOS cams are +8 degrees from Intake to Exhaust duration and on a 113-114 LSA....but you may want to call just to make sure.

Rottluver

I know you can use nitrous on stock motors (cams) but if you are building a motor (or upgrading yours) I would call and ask as I suspect thy use custom grinds.

Wishmaster

I asked him and he said that I can throw as much NOS to the motor as I feel comfortable with..the cam will be just fine...

Rottluver

Sounds like you are set for some fun then.

Wishmaster

without the NO what kind of number you think I will put out? HP/TQ

Im not looking for a dyno queen,,I want accellaration and the guy from camshaft innovations said the cam was designed for that..

Jerm93z28

all cams are designed for accelleration.

Wishmaster

here's some info on my cam....can you guys explain? does this seem like it will get the job done?


Cubic Inch and Engine Type 383 CID Small Block Chevrolet
Camshaft Type Hydraulic Roller
Firing Order STD SBC
Cam Bearing STD SBC
Lobe Separation 113.5
Overlap at .050” 2.2 Degrees

Camshaft Measurement Intake Exhaust
Duration at .006” 281.5 286.5
Duration at .020” 255.5 260.9
Duration at .050” 226.0 232.1
Duration at .200” 145.4 151.7
Lobe Lift .34961” .35323”
Rocker Ratio 1.52 1.52
Gross Lift .531” .537”
Lash HOT HYD HYD
Designed Lobe Centerline 110.9 ATDC 116.0 BTDC
Open at .050” 2.1 BTDC 52.1 BBDC
Close at .050” 43.9 ABDC 0.1 ATDC
Lift at Top Dead Center .0587” @ 110.9 In. Cente .0591” @ 116.0 Ex. Center

Spring Recommendation Hopefully the AFR springs work. If not, contact me for a spring kit.
Cranking Compression 189 PSI
Vacuum At Idle 15.7 Inches
Idle RPM 850 RPM
Peak Torque RPM 4400 RPM
Peak Horsepower RPM 5500 RPM
Torque Convertor Stall 4000 RPM to 4500 RPM (Flash In High Gear At 5-10 mph)
Starting Shift Point RPM 6300 RPM
Starting RPM To Cross 6600 RPM
NORES: Visit my site and read about how to install the camshaft by the “Lift at TDC”.

YenkoST

That's not a lot of overlap...who knows...maybe its the way to go but I've read for a performance cam....you should go between 40-60 degrees of overlap.

ws6transam

That looks like a fine stealthram cam, Wishmaster.

About the only thing I see that is odd might be the flash point for that torque converter, for which I must whip out my " non-scientific rule of thumb". If you consult your torque converter manufacturers, I think you will find that they recommend a stall speed that hits at about 800 RPM below peak torque.

This recommendation appears to hit directly on peak torque for the flash point. That'll make for some monstrous torque on the launch for sure. I guess if it were me, I'd get the higher stall speed if the car is equipped with sticky tires and skinnies out front. Otherwise, I'd pick out a really good lockup converter that will stall at approximately 3600 RPM when hit with 475 ft.lb of crankshaft torque.

Wishmaster

well Im going to have to live with what I got..I cant afford a new stall right now.....I think I get one free re-stall....but then again, how do I know what the stall will stall at? Ive heard that a converter setup to stall at 3000 on a 305 might stall alot higher on a bigger cubed motor....so I guess I just have to wait and see what happened when I hit the gas