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I plan to be removing my 340hp engine to do some detailing and replace the pilot bushing. One project I have considered is replacing the "097" cam with a more efficient profile while the engine is out ( engine only has 5000 mi on it ,runs well). I have seen posts I belive on this, but can't seem to find them. Is this worthwhile, which cam,what other parts, and where could I find some good instructions for a first attempt at cam r/r for someone with good mechanical skills. Thanks all!
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Re: 63 cam
If you want to go to a hydraulic cam the L79 "151" cam advanced 2 degrees is a good choice. If you want more Comp Cams 270 grind packs a lot of power. Be conservative on the cam if ya want to NCRS judge since the "roll" becomes more pronounced as you go for more power. The stock 097 solid cam you now have is some what a high rev and no bottom end. A solid lifter cam with around 220 degree at .050" and 110-112 lobe spacing or hyd of 225 Degree at .050" and 110-112 lobe spacing would feel similar in response. The L79 cam is a bit milder than this with it's 222° @ .050" and 114 spacing. -
Re: 63 cam
I've run extensive computer simulations on both OEM and some aftermarket cams and the LT-1 cam makes the best street high performance torque curve. It produces as much low end torque as the 151 cam, which is more than the 097 and more top end power than either the 151 or 097 cam. The 30-30 cam (346) makes marginally more top end power, but 20 percent less torque at the bottom end, which is too high a price on a street engine.
The LT-1 cam cannot be simulated from it's published specs, but once I took a lift-crank angle diagram I was able to characterize it for the simulation programs and it's the best. I highly recommend it for all solid lifter engine rebuilds including 283s.
The LT-1 cam was the culmination of 15 years of Chevrolet development work on small block valve timing, and it shows. It has an asymmetrical profile, which is easy on the valvetrain. The centerlines are very unusual compared to most cams, but the simulations show it to be the best available that will be comfortable with the standard OEM valvetrain components.
I've submitted a lot of posts over the last three years on this cam, so you might search the archives under my name to find some of them.
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