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Old 06-06-2010, 01:11 PM
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Hyd roller cam with iron heads.

I have a question about running a hyd roller cam with my cast iron heads. I am running a set of 291 double hump heads. They have changed to 2.02 intake and 1.60 exhaust. They have screw in studs. I have changed out the 1.25 stock springs for .600 max lift single springs with damper. I have been running a .525 solid lift cam, but would like to upgrade to a hyd roller around the same lift. My question is can I do this with the springs I have on my heads? They are on a 383 stroker motor with an Eagle rotating assy. Thanks for your time.

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Old 06-06-2010, 02:13 PM
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If the springs were correctly set up for the solid flat tappet. They will usually work on a hydraulic roller of similar specs.
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Old 06-06-2010, 02:22 PM
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Hell yeah i dont see why not............
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Old 06-06-2010, 02:44 PM
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Thanks guys. I have been told that to run a roller cam that I needed to have atleast 1.40 od double springs on my heads.
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Old 06-06-2010, 02:53 PM
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I'd call the cam company. They are the best ones to ask for the particular cam. Just have the spring pressure and size ready for them and tell them the specs of the cam you are wanting to put in.
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Old 06-06-2010, 02:55 PM
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Thunder is absolutely right. Call the cam company, choose your cam, and match the springs to the cam. Whether heads are iron or aluminum does not matter. Good luck.
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Old 06-06-2010, 03:02 PM
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Thanks again. My only concern was the OD size. But i figured that if the cam is not more than .600 max lift that it should be fine. The springs I have are 130 lbs. of seat preasure. Going to take them to the machine shop tomorrow to have them checked just to make sure before i buy a cam.
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Old 06-06-2010, 06:32 PM
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It is not so much the diameter of the spring or its max lift rating as deciding factors. The spring seat pressure and open pressure and spring rate have to be correct, those are the three things to look at.
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