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#1
09-13-2005, 09:20 AM
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Finding Base Circle of Cam
I am adjusting my valves soon on my .030 over 400. I have HS 1.5 roller rockers, Comp Cam 292 Magnum Hydraulic Camshaft and lifters, #13 heads milled .010. and stock length 5/16" pushrods.
I am going to use the Pontiac Street Performance method of adjusting with engine off. I am doing this with the manifold on and valve covers off. I am locating TDC with finger in spark plug hole and feeling compression stroke. How do I know that I am on the BASE circle of the cam when adjusting? Does it need to be exactly on the base? Any help is greatly appreciated. Thanks! |
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#2
09-13-2005, 09:28 AM
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This site might help you 68blkbrd. I followed these steps and although it took some time my car ran great. With the car on top dead center this method will help you find the base circle.
http://www.angelfire.com/fl4/pontiac.../valveadj.html Robert
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4. |
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#3
09-13-2005, 07:06 PM
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A foolproof method is as follows:
For each pair of valves on an individual cylinder - rotate engine until intake valve closes. Adjust exhaust valve. Rotate engine more until exhaust valve just begins to open. Adjust intake valve.
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---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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