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No matter which camshaft you choose remember, Wrench…Drive…Enjoy…. The cam companies all have their own "grind numbers". Anytime you replace a camshaft you must also replace the lifters. This number is ground into the cam and can't be altered without physically changing the camshaft lobe profiles. Too much lift and you can make contact with the pistons not only ruining parts but your day as well. Neal Litherland is an author, blogger and occasional ghostwriter. This also refers to the term overlap which is the amount of time both the intake and exhaust valves on one cylinder are open at the same time. Camshaft, in internal-combustion engines, rotating shaft with attached disks of irregular shape (the cams), which actuate the intake and exhaust valves of the cylinders. Typically camshaft manufacturers list this measurement by multiplying the cam lobe lift by the stock rocker arm ratio, usually 1.5:1. A camshaft with 106 degree lobe separation angle will have more overlap than one with 112 degrees. Step 16: Install the camshaft gear onto the new camshaft. It’s okay to reach out to the camshaft manufacturers for advice (you’re not asking for directions). Lobe lift refers to the distance that the camshaft can move the pushrod in turn “lifting” the valve off of the seat (opening the valve). It is typically located in the center of the cam between the lobes. There is a limit to the amount of air an engine can move and opening the valve further than needed becomes counterproductive. Match the number to a Chevrolet camshaft part number listing. The main focus of this article will be on a conventional OHV (overhead valve), cam-in-block engine configuration using two valves per cylinder, as shown above. Valve lift is computed for stock rockerarm ratio (1.73:1 for 400, 351-C & Boss 302: 1.60:1 for all others) Source of information: Ford Performance by Pat Ganahl, an excellent reference book on Ford performance engines Old Lunati Camshaft Part Numbers. Re: Where can i find camshaft Id Numbers . is this standard? Thanks author: message: admin. Also at the rear journal were GO8 with the letter M inside the O. Ted went on to give the spec's for the Melling RYB-10 camshaft. A crankshaft is a shaft driven by a crank mechanism, consisting of a series of cranks and crankpins to which the connecting rods of an engine are attached. (It is why a camshaft's RPM Range is based on its duration.) The roller cam will have much more rounded lobes, like the big end of an egg. Do not rotate camshaft or crankshaft with timing belt removed and cylinder head fitted. 114* LSA . Roller lifters have rollers that ride on the cam lobes and provide less resistance and more power. Meanwhile, a spring exerts a tension pulling the valve toward its closed position. Camshaft Number Lookup . Using a Dial Indicator and Degree Wheel, find the opening and closing points of the valves at 0.050 in. Most Cam Cards will list duration. A cam lobe forces a valve open by pressing on the valve, or on some intermediate mechanism, as it rotates. How To Identify Camshaft Numbers Long duration camshafts also create more Valve Overlap. This information is required to calculate the ignition point and injection point, among other things. camshaft application chart notes: comments mech/ dur @ .050” adv. More on that another day. Gene Stoehr. On this page, you can find out how a fault on the camshaft sensor can manifest itself, and which steps should be taken during troubleshooting. As I said before it’s extremely important to match the cam to the engine and its intended purpose. Most cam companies include an intake centerline number, which is the position of the intake lobe centerline (in crankshaft degrees) relative to top dead center on piston number one. The camshaft in your engine may be the most complicated piece of steel in your engine. It's a 'Camshaft Machine' brand replacement cam for the GM part number 3863151 small block Chevrolet hydraulic lifter camshaft (350 HP 327) 222*@.050" cam lift..447" lift. Less duration tends to produce more low end torque with a better idle but reduces the ability to make power in the upper rpms. You must always use the lifter type that the cam was ground for as each lifter type requires a unique camshaft design. It's the cam part number and grind number . The hydraulic lifters on the other hand are more of a set it and forget it option but you will be limited in the amount of rpm they can handle. However, at low rpm, the open valves reduce the pumping pressure of the piston. 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