cam info

[freddiejip]

Looking for some insight on cams and what it all means. I know enough to get myself in trouble but need a lot more schooling. I'm running a 379 sbc and wondering what to do. Afr 220 heads, 13.5 compression, super victor 2 intake and a Barry grant 825 carb. It's in a pull truck and I would like to be able to run 8,000 plus and have the power to keep the rpms up at the end and not get sucked down. Any knowledge you guys are willing to share would be great. Thank you

[wyrmrider]

motor already built?
what cam?
where do you need more?
what rocker arms?
how did you measure compression, cc the heads?
what's your quench
what kind of cam?
for no bs
http://jonescams.com/tractor-pull/

[lada ok]

I'm afraid I don't know much about the ' GO ' gear your talking about, BUT. ... sounds like you need good torque and HP @ 7 - 8000 rpm

Here's a guess, say about 546 hp @ 6900 - 7100 TQ band should be reasonable, beyond those revs ?
Maybe careful gear selection and tampering with the tq curve ex / in pipe lengths, cam position etc would help

IN 290* 36-74 70-32 EX 282* @ 0.006" lift .610"

you might be able to use a more aggressive lift rate on the EX lobe as the valve is much smaller

Hopefully someone else will pitch in, I'm possibly of track here ?

[freddiejip]

Solid roller cam. My big issue right now is at the big end of the track where it really bites in and I don't have enough to grunt out that few extra feet. Any info on duration, lobe separation, ramp speed. What it all does and what each part of it benefits or how it can hurt. Looking to learn

[wyrmrider]

go to the suggested website
post all of the required information here

[pdq67]

Please call UDHarold here at 662-562-4933 and ask him what you need.

He will tell you just exactly what you need!!

And if you do, please say hello from ol' pdq67 for me.

pdq67

[lada ok]

Please call UDHarold here at 662-562-4933 and ask him what you need.

He will tell you just exactly what you need!!

And if you do, please say hello from ol' pdq67 for me.

pdq67

please let us know the result ... ta

[freddiejip]

270/272 duration
.432"/.424" lift
112° lobe separation
This was through jones

[wyrmrider]

and also what does jones say?

[freddiejip]

That's what he told me he would grind for my motor

[wyrmrider]

and how does it work?
any test results yet
what were you using?
????

[freddiejip]

No test results as my pulling season is over. I originally started this topic trying to learn what each aspect of the cam spec did for performance like too much lift, not enough lift, duration, lobe separation not enough or too much

[wyrmrider]

Best to work with mike on a pull truck and most everything else unless you have lots of experience and/ or customers experiences where you can call your own shots
pioneers are the ones with arrows in their backs

[rm81malibu]

No test results as my pulling season is over. I originally started this topic trying to learn what each aspect of the cam spec did for performance like too much lift, not enough lift, duration, lobe separation not enough or too much

Would be good to see that discussion. How about posting the old cam specs for comparion to the one spec'd above?

[wyrmrider]

also were your heads out of the box or ported and what exhaust?
Is there a tranny
if so what is your rpm drop when you shift- what does the rpm drop down to?