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Old 12-30-2010, 02:54 PM
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Original Cam SPecs for a 77' 350 K10 truck

My Father in law needs head gaskets in his 77' 350 farm truck, I have an edelbrock performer intake that is sitting, so thats going on it and because I have nothing better to do in my spare time as a mechanic I am looking at the generic Performance cam 420. 442. lift. to throw. DOn't ask why I am doing it I just feel like it.

Is it worth it performance wise the cam new costs me 62.00 dollars, and I have lifters just sitting to go in so the extra 6.23 for a felpro cover gasket has me wanting to do it.


What I want to know is roughly what was stock lift on a 4 bolt truck motor just to compare lift to lift? Thanks

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Old 12-30-2010, 04:14 PM
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It was .410" lift I believe.
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Old 12-30-2010, 04:16 PM
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lift would have been around 0.390 and short duration. around 180 degrees
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Old 12-30-2010, 04:33 PM
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In that timeframe the stock 350 in a truck was only rated at about 160 HP, and the stock cam was very conservative. I've seen the specs a couple of times, and I think duration was about 185 at .050. The "hot" cam of that era was the GM 929 cam, and even that was only 195/202 at .050.

You can probably go up to about 204/214 (like the Edelbrock 1102) without losing the low end torque you need (heavy truck). Anything beyond that is probably not worth it unless want to do other mods.

Bruce
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Old 12-30-2010, 07:44 PM
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thanks guys, I figured the truck was under a .400

this is the spec I am going to use
ro-2000 Perf. Cam; Hyd., (050) Duration at .050 Lobe Lift, 214 Exh., 204 Int., 112 Degrees Lobe Separation, 0.443" Exh. Valve Lift, 0.42" Int. Valve Lift
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Old 12-30-2010, 11:45 PM
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The cam and intake combo is ideal for the trucks purposes. Anytime I`ve did a stock rebuild that`s the cam I use. That same cam still gets recommended alot on this board by myself and others.
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