Inliners International Forums General Discussion Hi Performance Yet another 292 cam question

Hello all,
I'm building a fresh 292 to put in my truck.
The 194 head has 1.94 intake/1.60 exhaust,port/polish with no bolt-boss removal,and screw-in studs with Z-28 springs.
The block will be bored .060 with alum.LPG pistons. The whole rotating assembly lightened and balanced.
I'd be interested to hear from anyone with similar head work (or a strong opinion)as to wht they are using (or would use) for a cam in this baby.
Thanks,
Conan

how do you intend for it to be driven? or how do you want it to behave. is it automatic trans/stick, what gears. sounds like the compression should be around 9.5 with that head. give us some more info. tom

The Z28 spring is not going to handle more then a 550 lift cam.

3/4 ton flatbed (hauls almost that much daily)
4 spd. 4.11:1 ratio
Holley 600/Offenhauser(heated)
Tom Langdon's cast headers 2-into-1 3"outlet
440lift I/E marine cam from Langdon's
She'll always be a hauler.

http://webpages.charter.net/c_walter/id24.htm

It's Looking very good. Keep us Posted.

i would look for a hydraulic cam with 215 - 222 degree duration @ .050 lift. also try to stay below .500 lift. any more duration will hurt low end. tom

Thanks Tom. I figured that marine cam had too much duration(260) for the oversized valves.It runs great with the stock head. What problems will I run into going beyond .500 lift ?
Here are a few grinds recommended in the power manual based loosely on your parameters of 215-220 duration and .500 lift.

1. Duration 194I/204E
Lift.464I/.494E
Centerline 110

2. Duration 212I/218E
Lift.518I/.530E
Centerline 109

3. Duration 210I/212E
Lift.490I/.508E
Centerline 112

Could you comment on how any of these might run in my build? All input is appreciated.
Thanks, Conan

#1 real good torque/ light performance
#2 real ggod torque/ 500 rpm over stock power range, little rough idle w109 centerline
#3 probably best choice. 112centerline gives good idle, around .500 lift keeps valvetrain from wearing too fast. it is really not needed to go bigger for street. for the little gain it really wears out faster. still have a power band 500-700 rpm over stock.
i have ran a cam with 270 advertised duration from clifford. just seemed to be the wrong cam. it was a straight grind and i would guess the .050 duration is closer to 230. head was the same as yours. tom

Conan,

Cam durations are given in two specifications, total duration and 0.050 lift duration. The total duration spec also varies from manufacturer to manufacturer, with duration starting between 0.000" to 0.006" lift.

Total duration: Usually between 240 and 270 up to about 296
0.050 duration: Usually between 170 and 220 up to about 238.

So that marine cam with a total duration of 260 may have a 0.050 duration of approximately 204 to 212.

Without measuring that 194 head and doing the math, it seems like the LPG pistons would bring a 292 well above 9.5:1 CR.
I used the LPG pistons, and 292 head with 1.50/1.94, 3 angle and lite blending. I used that 194/204 cam with new stock valve springs.
My '67 3/4 4spd weights 4600 LB empty. The week after I got it running, I changed the 4.56 gears to 3.54s. That really woke it up. It runs down the road at 75 with no effort, but it's still just a truck, not a race car. It starts pulling really strong at 1500-1600 rpm and that's what I wanted. I wanted it to run under 3,000 and I'm happy with the results.