I know these are pretty New , But has anyone got any experiences with these springs ?
Are they reliable like the original PRCs ?

Whats the pressures like ?
Installed height pressure ?
Open pressures ?

Need a spring that will take just under 670 lift for my 408 with L92 heads . .
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Precision Race Component EHT .675" Spring Kit
Item#:
199-675SpKit
Price/ea.
$349.99


Precision Race Components EHT Dual Valve Spring Kit Includes The Following Items:

The Precision Race Components Double Valve Springs Rated To .675" Lift
Precision-Machined Titanium Retainers
Hardened Machined Spring Seats
New Viton Valve Seals

This spring kit is the top of the line double valve spring kit on the market. These valve springs offer over double the valve spring life of other spring kits on the market! You can get double the valve spring for a fraction of the price!

 

I run them on my TFS heads....235 243 620 623 111+3 LSL comp cam...set them up at 1.795-1.800....i think they were 165 or 170 on the seat and 470 open...cant remember

 

https://ls1tech.com/forums/generatio...pring-kit.html

 

i have them with my ms4
everything seems great they solved my problem with valve float at high rpms that i had with 660 springs

 

Glad to hear they solved your problems...thanks for the feedback! We can tell people all day that they're a better spring, but it's "regular Joe's" comments that tell the story

 

I see they don't have locks advertised in the package. Do you have to use the factory ones or what?

 

used my factory locks with mine, Thats what Texas speed recommends using also

 

Alright, sounds good! Thanks!

 

Anyone else? Getting ready to do a ecs blower cam install

 

We've probably shipped 4000-5000 of these springs so far. They really are impressive, I ran a 2.100 stainless valve to 7400rpm at .708" lift with these things! I have no doubt this spring will support a L92 valve at .670"