Category Camshaft
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Pontiac stroker engines using Eagle crank, rods and pistons
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What exactly is a Pontiac "stroker engine" ? What are the advantages and disadvantages? And what is involved in building one?
Many ask themselves about the Pontiac stroker engine. What is this all about? Here are the answers!
A stroker engine is basically just an engine that has had the stroke increased to more than was originally from the factory. A stroker kit is a collection of components that make building a stroker engine possible. Sounds easy, right? Well, there are limitations to what can be done depending on which engine you are building. More on that in a minute. Why you would want to build a stroker engine is a question that first must be answered.
To understand the
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Pontiac Camshaft Cross Reference
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The following information is provided as a guide only. Every attempt has been made to accurately represent the manufacturer's specifications. Before choosing a camshaft confirm specifications with the manufacturer.
The camshaft manufacturers are sorted alphabetically and are listed in terms of duration.
Manufacturer's Name
Part Number
Advertised Duration
Duration @ .050
Lift With 1.5 Rocker Arms
Lift With 1.65 Rocker Arms
Lobe Separation Angle
Intake Centerline
Pontiac OEM
9777254
269/277
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113
112.5
Pontiac OEM
9779066
273/282
200/210
.408/.407
.449/.448
111.25
106.5
Pontiac
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Degreeing a Camshaft
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HOW TO DEGREE IN A CAMSHAFT ON A PONTIAC 326-455
For my 400 engine rebuildI chose the Competition Cams 270H camshaft. It has a lift of .470" on the intake and exhaust. With Magnum Roller Rockers it is .006" higher. The cam is designed to be positioned straight up, that is, dot to dot, on the timing sprockets. If it measures correctly, straight up will match the recommended 106 degree intake centerline of the manufacturer. (By the way, it did.)
There are several ways to degree a cam. This is my version. As indicated above, my engine is a 400. The following method worked exceptionally well for me and applies to when you have the heads off the block .
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Rocker Arm Adjustment
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Pontiac Rocker Arm Adjustment
After two decades of weekly hands-on with various Pontiac V8 engines, one area that is always given insufficient attention is the correct setting of the rocker arms.
Whether you have decided to stick with the stock type stamped rocker arms or upgrade to Competition Cams Magnum Rollers Rockers (as pictured below), or go for big buck rockers, the correct setting of valve lash is key to getting the best from your valve train . Torquing the adjusting nut per the old Chilton's to 20-25 ft pounds won't work on any heads that have been milled. This is especially true with the high lift cams of today. The valve train needs to be adjustable. Some
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