Is this too much cam for a TBI truck?

[y5mgisi]

heres cam specs
Basic Operating RPM Range: Idle-5,500 RPM
Intake Duration at 050 inch Lift: 204
Exhaust Duration at 050 inch Lift: 214
Duration at 050 inch Lift: 204 int./214 exh.
Advertised Intake Duration: 262
Advertised Exhaust Duration: 272
Advertised Duration: 262 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.420 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.442 in.
Valve Lift with Factory Rocker Arm Ratio: 0.420 int./0.442 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Quantity: Sold individually.

Camshaft, Hydraulic Flat Tappet, Advertised Duration 262/272, Lift .420/.442, Chevy, what do you think?

 

[b454rat]

What size motor?? The bigger the motor the "less" the cam will be. Meaning on a small motor the cam will sound bigger, and the bigger the motor the cam will have less lope to it. I ran a 268 cam in my TBI 406. Dunno the specs off hand, but cams was Comp Cams Xrme Energy 268. Didn't have any problems.

 

[y5mgisi]

nevermind i found out that its a fine cam for tbi. Its a 350 though just so you know.

 

[K5er4Life]

that would be a fine cam, Im running something very similar to that in my 383, but do plan on doing a bit of tuning though.

 

[Russell]

Yep, that'll work great in a factory EFI application! Good choice!

 

[y5mgisi]

actualy SierraClassic, it was you in another thread that i found telling someone there cam was fine that had the same specs as mine. So thanks you answered my question before i even asked it.

 

[Russell]

Just be aware that that cam is a bit more geared towards a higher end engine, and you'd probally want to go with the bigger 454 throttle body, and an aftermarket intake to allow the engine to breath a bit better. Any stock 350 TBI I've had fell flat on its face at about 4800 rpm, which is a fair bit below the powerband of the cam you've selected.

Its a big mistake that guys make, putting way too much cam in for an EFI system. I'm personally looking at an XE256H Comp Cams Computer camshaft, which makes power from 1000 - 5200ish rpm. Even considered an XE249H, but I think that its worth getting the slightly bigger cam, simply becuase I'm running a slightly more exotic TPI setup, which can be made to flow a bit easier than a TBI setup.

If you want to run stock EFI systems, your goal needs to be building an engine that is geared for low end grunt, and is built to operate within the restrictive abilities of the stock EFI system itself. If you want a high performance engine that is built to make big power, and rev really high, you want to consider an aftermarket EFI system, or a Gen III engine swap.

Yes, the stock systems can be made to make big power, but it costs big bucks, and takes a large amount of time to get it tuned properly.

 

[JEBSR]

That is damn near identicle specs to my LT1 L89 cam in my rig and I have no problems with it at all.

 

[Russell]

That would be a roller cam though, big difference between roller and hydraulic lifter cams. Roller runs far smoother and works very well with EFI, even with far more aggressive profiles.

 

[y5mgisi]

Also, What does this thing do? could it be a part of my problem? Its the ONLY thing i havent replaced.

ESC module used on 1985-88 model tpi's. Later years will not have one as the spark control is embedded on the prom.

 

[Russell]

That one backs off your timing when knocking is detected by the knock sensor

 

[y5mgisi]

oops! meant to post this in the other thread! My bad. But thats good enough. thanks for all your help so far Russell!