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Weekend Racer 12-15-2023 10:25 AM

SS/valves springs
 
Time to replace valves springs. Plan on PSI DR424RML. SBC, SS engine iron head. What are yours tought ?
Thank You!

Hacksaw 12-15-2023 02:25 PM

Re: SS/valves springs
 
Seems too light on pressure to me. At 250 lbs. on the seat, if you lose 20 after break in .....

SpeierRacing 12-15-2023 04:45 PM

Re: SS/valves springs
 
I use a PAC 1356 on all new heads or freshens I do. On my personal engine I used a Manley 221420 but set them up taller because I have more lift.

Rick J 12-16-2023 07:54 AM

Re: SS/valves springs
 
Quote:

Originally Posted by Weekend Racer (Post 690200)
Time to replace valves springs. Plan on PSI DR424RML. SBC, SS engine iron head. What are yours tought ?
Thank You!

Not near enough info to make a recommendation -

Valve weight ?
Lobe duration @ .020" minus lobe duration @ .050" = ?
Rocker ratio ?
Peak rpm @ the stripe ?

Weekend Racer 12-16-2023 10:28 AM

Re: SS/valves springs
 
You have PM

Weekend Racer 12-16-2023 11:02 AM

Re: SS/valves springs
 
Quote:

Originally Posted by SpeierRacing (Post 690214)
I use a PAC 1356 on all new heads or freshens I do. On my personal engine I used a Manley 221420 but set them up taller because I have more lift.

You have PM

Rick J 12-16-2023 11:19 AM

Re: SS/valves springs
 
Quote:

Originally Posted by Weekend Racer (Post 690233)
You have PM

Replied

Matt@PAC 12-21-2023 10:14 AM

Re: SS/valves springs
 
Quote:

Originally Posted by Weekend Racer (Post 690200)
Time to replace valves springs. Plan on PSI DR424RML. SBC, SS engine iron head. What are yours tought ?
Thank You!




Feel free to share specs or call in for a recommendation.



866-799-9417 or 248-621-0480

Larry Hill 12-21-2023 10:22 AM

Re: SS/valves springs
 
^^^^^^^^^^^^ Matt is always very helpful!


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