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Old 01-25-2003, 04:32 PM
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Post 1.94/1.50 Head

What is the max lift on a pair of completely stock 1.94/1.50 heads. They are new rebuilt heads that were built to stock gm specs.
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Old 01-25-2003, 06:46 PM
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what casting nos.? most will take .480 some will take .500 if the springs will take it. most stock castings won't flow much over .480 and more is usually a waste of effort.
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Old 01-25-2003, 07:27 PM
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I agree with Bob, Usually if you can place a paper clip in-between the springs when the valve is all the way open, you will be ok. A 480 lift cam with stock heads is plenty, its not the lift that gets your power, its the valve timing, duration, and compression that makes the biggest differances I feel.
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Old 01-25-2003, 07:39 PM
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I agree that around .480 is ere a stock 1.94 will be peaking.
As for the lift and duration as far as I see it lift is just as important in that each head will flow best at a certain lift.I personally would wanna find were peak flow would be and go slightly beyond that so that you see peak flow wile the lobe is going up and wile the lobe is comeing down.Say the head maxes at .470 go like .485
Thats my .02 worth of stock in General Electric
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Old 01-25-2003, 08:25 PM
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I have a set of 461's on an engine with .501 lift cam. No problems, just upgraded to 110 lb seat pressure springs.

Chris
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Old 01-25-2003, 09:25 PM
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So are you guys saying that if the springs max lift is .470 I can go with a cam with more lift like .485 or something like that. Won't that damage the springs. I'm kinda confused. Can someone explain it all for a retard like my self.
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Old 01-26-2003, 03:22 AM
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no, if the springs max rating is .470 thats all you can go, you will bend things above that. The other is about the valves ability to lift and the heads flow, with the correct spring and clearences.
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Old 01-26-2003, 10:31 AM
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Yea you wanna match the springs to the cam.To light a spring will cause valve float at higher rpm to heavy a spring will cause excesive wear.
As far as .480lift thats aprox were a stock 1.94 head peaks (flow wise),anymore lift will just be lifting past the heads peak and little or no performance will be seen from the excesive lift.
Pretty much w/ a stk 1.94head keep lift to around .480 then install the correct springs or check your existing ones for pressure and coil bind.
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Old 01-26-2003, 12:15 PM
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Thanks for all the help guys. I understand now. I guess I'm kinda slow at some things. Thanks again.
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