Pac Racing Springs Valve Spring, 1200 Series, Ovate Beehive Spring, 313 lb/in Spring Rate, 1.140 in Coil Bind, 1.290 in OD, LS-Series, Set of 16 (PAC-1218)

Yeah boi pac1218 springs for the win. Great product. Plus they come with stickers so you can show off how cool you are without having to open your valve covers at the local car shows..

Installed on my ls1 with 585° lift cam no issues great quality, would recommend

Had about 3 hours of run time and possibly 8 miles running great on a fresh 5.3 heard a pop. Clatter boom catastrophic damage thanks to a broken spring. update after more research the issue wasn't the springs it was the head shop.

I have had these on my 5.3 with sloppy stage 2 cam for a while now with zero issues.

I installed the Pac Racing valve springs on my 2011 Corvette Grand Sport (LS3) when I replaced the stock 1.7:1 rocker arms with a set of Comp Cams 1.8:1 Ultra Pro Magnum rockers. I've logged about 1000 miles since the installation and the engine behaves all the way to 6500 RPM. I bought these springs based on recommendation by others running this combination and they seem to be a good match.

Arrived on time and as advertised. Installed them on my cam only 5.3 but haven't ran it yet. I have a set of these on another cam only 5.3 and they work very well.

Great springs installed very easily.

Used PAC springs on several LS builds. Great product.