Can anyone help identify this GM cam?
09-15-2009, 11:53 AM
#1
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Location: Holtville, Southern Cali
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Can anyone help identify this GM cam?
Hey guyz. I was wondering if anyone can help me out identifying this camshaft. It is the original but I need to know what is the GM part number if possible so that I can get the the specs so that I can make a compairison. The stamp that is on the cam is 156-CPC-BC-15. Any help would go a long way. I bought a block from a junkyard and the personel didnt know what the block came out of. the only thing that could help identify is the engine casting number which is here 14093638 1987-95 350 2/4 Roller or flat tappet cam one-piece rear seal . The block has the heads with a swirl intake. I almost forgot, the cam is a roller.
09-16-2009, 11:42 AM
#2
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Join Date: Mar 2002
Location: Byhalia Ms, just south of Memphis
Posts: 381
what are the head casting #s? does it have the "spider" retainer in the middle of the valley? some 1 pc motors were still flat tappets. the heads will give a good indication if it were from an F car or not.
09-26-2009, 08:48 PM
#3
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Join Date: Dec 1969
Location: Phila., PA
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If it's got swirlies on a 350, it's an LO5 engine (350 TBI). Roller cam means it's almost certainly from a passenger car since trucks didn't get roller cams until much later- around 1995 or so.
There were different cams used in them but most got the same "peanut cam" that the little 305 TBI (LO3) engines got. Specs were something like 179/192* @ .050, 109* LSA, lift well below .400" on both intake and exhaust. A pathetic slug of a cam.
Some LO5s like Police car engines got a "hotter" cam, but even that cam was only about 192/202* @ .050 or thereabouts with lift near the .400" mark and a 112* LSA, I believe. Still nothing to write home about. A "pickup truck" cam, basically.
Even the smallest aftermarket cam is likely to look like a real fire-breather compared to the stock LO5 cam. A stock production line L98, LT1 or LT4 cam would be a monster compared to it (they're very similar cams except that the LT-series cams had more lift). Many have upgraded their TBI engines with one of these cams for a mild street driven application. They work great, but tuning of the ECM is pretty much mandatory- the TBI system is very sensitive to cam changes and anything else that significantly alters the basic breathing characteristics of the engine.
There were different cams used in them but most got the same "peanut cam" that the little 305 TBI (LO3) engines got. Specs were something like 179/192* @ .050, 109* LSA, lift well below .400" on both intake and exhaust. A pathetic slug of a cam.
Some LO5s like Police car engines got a "hotter" cam, but even that cam was only about 192/202* @ .050 or thereabouts with lift near the .400" mark and a 112* LSA, I believe. Still nothing to write home about. A "pickup truck" cam, basically.
Even the smallest aftermarket cam is likely to look like a real fire-breather compared to the stock LO5 cam. A stock production line L98, LT1 or LT4 cam would be a monster compared to it (they're very similar cams except that the LT-series cams had more lift). Many have upgraded their TBI engines with one of these cams for a mild street driven application. They work great, but tuning of the ECM is pretty much mandatory- the TBI system is very sensitive to cam changes and anything else that significantly alters the basic breathing characteristics of the engine.
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