camshaft replacement

stevejohnsonMember

Hello i have a question about camshafts,i currently have a 351 cleveland in a 73 pantera that was rebuilt some time ago to a boss 351 spec with a solid lifter camshaft and high compression pistons and closed chambered heads that have ben modified to use adjustable rocker arms,i want replace the cam with a nice hydraulic camshaft that was mentioned on this site georges 275/285 street profile,having low vacuum issues with the current solid lifter cam by comp 282/292 adv duration and 570/590 lift.is there anything i have do besides lifters that i need to do when going from Solid cam to Hydraulic cam.rocker arm are comps 1.73 roller tip.appreciate any comments.

1/13/219:24 AM

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Original Post

stevebuchananMember

You could stay with a solid lifter cam and just get a milder grind from Comp Cams along with new lifters. The milder grind would likely solve the low vacuum problem. This might be the most practical approach.

If you go hydraulic you might consider the roller lifter setup. I have it in one of my Panteras and the power band is very friendly. There is plenty of vacuum at idle along with gobs of power when the throttle is opened.

But any of these changes takes careful engineering in regard to pushrod length, geometry of the rockers, and spring rates. These are just examples of the complexities. Converting to the hydraulic roller has additional complexities including the retaining system that keeps the lifters from rotating in the bores.

All of this is actually above my pay grade the experts on our forum can likely provide better guidance.

1/13/218:54 PM

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