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07-08-2019, 03:07 PM | #1 |
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valve spring pressure
350 sbc, flat tappet hydraulic cam(stocker motor) Thinking I have valve springs going causing car to not turn over 5500rpm. I used an on car spring tester. I got 110ish to just open valve and around 250ish at .500 lift(1/2" measurement), tested with that valve closed and I could spin pushrod with my fingers. Looking at Pac 1409x , it shows like 150/390. I'm thinking the springs are gone??
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07-08-2019, 04:47 PM | #2 |
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Re: valve spring pressure
There is a design difference between beehive and conical springs. Read this link before making your decision.
https://www.chevyhardcore.com/tech-s...sign-dynamics/ I run PAC 1427 conicals in my SBF 302 with N351 heads. They are right below the 1409s you are looking at. BB Chevy stock elim springs. They are 200/500 at 1.85 with my .597 lift cam. 6500 in the 1/8 all day. BTW I'm solid roller all the way. If you are stock, make sure the springs you choose are allowed.
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Dale Shearon 68 Mustang 6394 |
07-08-2019, 04:51 PM | #3 |
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Re: valve spring pressure
What type of lifters Schubeck? or a stock type,if so are they shimmed for limited travel?.It will matter on the spring pressure you can run. gsa612
Last edited by gsa612; 07-08-2019 at 04:57 PM. |
07-08-2019, 06:19 PM | #4 | |
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Re: valve spring pressure
Quote:
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Phil Molski S/C 1623 |
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