Was playing around on desktop dyno '03 the other night, looking for a cam that would best suit a TBI 350, with headers/mufflers.

I realize that this program is not entirely accurate, and I have no idea as to what this cam would really be like, but here are the specs of the best I could come up with.

(this is all in seat-to-seat timing, never quite got the .050" timing down right)

Intake / Exhaust
Duration:250 / 270
lobe centerline: 114 / 106
max lift @ valve .480" for both.

cam lobe center angle: 110 (112 is fine as well)
Valve overlap: 40

Ramp rate is set at 3. Not ENTIRELY sure what that means, but it is mild in terms of valvetrain acceleration.

Events:

IVO: 11
IVC: 59
EVO: 61
EVC: 29.

Is there something similar to this, or could one be ground *relatively* cheaply?

 

well depending on what is done to the motor as in compression and cylinder head flow. For a stock or near stock 305 that camshaft would be too big. I have seen most members here recomend and lt1 camshaft which has a duration at .050 of like 204. For a relatively stock 305 i wouldnt run much bigger than that.

 

Well, I actually have a 350 tbi in my truck... Would it bee too much for it?

Headers would go along with this cam, but otherwise leaving the heads and intake untouched. Stock engine, I do not even know if the block has the roller cam lifter retention spider bosses. It may have the bosses, but I will bet $50 they are not tapped. This is a 350 tbi out of a '93 suburban...

 

This would be a rather mild cam. 250/270 would probably end up somewhere around 206/218 @ .050 for a hydraulic flat tappet cam which is what I believe should be in a 93 350 truck engine. I would call one of the major cam vendors and price a custom grind and ask for their suggestion of stock grinds to suit your requirements.

 

350 tbi truck motors have the nipples in the blcok for the roller but are not tapped, you can tap them tho. I would look into one of crane emissions cam for computer controlled vehicles in there.

 

*snicker* Emissions.

I do not actually have specs on the stock cam... I think this one is mild but would show an improvement...

Thanks.

I did come up with some .050" timing. Duration there was 200/240 IIRC.

Was wondering if it would be worth messing around with or if an off the shelfer would be best...

On DD'03, this cam with headers/exhaust was making 375 ish lb/ft from 2K all the way to 4000K, and falls to 350 lb/ft at 4500rpms. I realize this is optimistic, but it should still be a bit better than stock.

I'd hate to give up too much torque below 2500, as it is still a truck. Just wanting to make a bit more torque for a bit longer, say close to 5000 or 5500 rpms.