Racing Springs

Pac Racing Springs is the world's premier valve spring manufacturer.  Nascar, Drag Racing, F1, rally and Sprintcars to everyday street performance engines use PAC Racing products to provide unsurpassed performance in all forms of Motorsports.  Innovative designs produced by skilled springmakers from the highest quality materials ensure the highest performing springs available.

Part #	Spring Diamters				Spring Loads		Spring Rate	Max Coil Bind	Max Lift	Comments
	Large End		Small End		Installed Height (Valve Closed)	Open Load (Valve Open)
	OD	ID	ID	OD
PAC 1218	1.290	0.885	1.055	0.650	130 @ 1.800	318 @ 1.200	313	1.140	0.600	Performance LS1 Ovate beehive valve spring for applications up to 0.600 lift.
PAC 1518	1.290	0.885	1.055	0.650	130 @ 1.800	318 @ 1.200	313	1.140	0.650	High performance LS1 spring that features additional processing for increased durability for high lift applications up to 0.650 lift
PAC 1235	1.210	0.805	1.035	0.630	135 @1.800	350 @ 1.200	358	1.160	0.600	Chrysler Hemi 5.7L & 6.1L valve spring for up to 0.600 lift
PAC 1223	1.105	0.742	0.943	0.580	90 @ 1.470	252 @ 0.970	324	0.900	0.500	Ford 4.6L 4 valve springs for up to 0.500 lift. Drop in design to fit without machining
PAC 1233	1.025	0.662	0.930	0.567	105 @ 1.670	270 @1.120	300	1.606	0.550	Ford 4.6L 3 valve springs for up to 0.550 lift. Drop in design to fit without machining
PAC 1220	1.445	1.000	1.095	0.650	155 @ 1.880	377 @ 1.280	370	1.210	0.600	BB Chevy spring for flat tappet & hydraulic roller applications
PAC 1283	1.250	0.845	1.085	0.680	110 @ 1.750	328 @ 1.150	363	1.080	0.600	SRT Viper V10 performance ovate beehive spring for applications up to 0.600 lift. Drop in design that fits stock retainers and seats.
PAC 1295	1.589	1.135	1.185	0.731	150 @ 2.000	385 @ 1.250	313	1.180	0.750	Large ovate beehive spring with higher load & lift for applications up to 0.750 lift
PAC 1409	1.250	0.845	1.055	0.650	150 @ 1.800	390 @ 1.250	436	1.190	0.550	Stock Eliminator - recent Rule changes allow the use of the latest technology which allows for a spring with reduced end size for a small lightweight retainer
PAC 1520	1.445	1.000	1.095	0.650	155 @ 1.880	377 @ 1.280	370	1.210	0.650	BB Chev spring features additional nitriding process for increased durability for high lift up to 0.650 lift.
PAC 1523	1.105	.742	0.930	0.580	85 @ 1.500	263 @ 0.950	324	0.880	0.550	Nitrided version of PAC 1223

Drag Race Springs

Part #	Spring Diamters				Spring Loads		Spring Rate	Max Coil Bind	Max Lift	Comments
	OD Outer	OD Outer	OD Middle	OD Inner	Installed Height (Valve Closed)	Open Load (Valve Open)
1200 Series features PAC Spring's Standard HP processing without scrificing performance.
PAC 1224	1.625	1.175	N/A	0.851	275 @ 2.000	810 @ 1.150	629	1.100	0.850	Dual spring - Bracket - High lift
PAC 1225	1.550	1.100	N/A	0.788	250 @ 2.000	765 @ 1.200	644	1.150	0.800	Small Dia. Dual Spring
PAC 1226	1.550	1.100	N/A	0.706	275 @ 2.000	805 @ 1.200	663	1.150	0.800	Small Dia. Dual Spring with Damper
1300 Series are premium processed with Nano-Peened™ surfaces for enhanced durability & exotic heat treatment for minimal load loss
PAC 1326	1.550	1.100	N/A	0.706	275 @ 2.000	805 @ 1.200	663	1.150	0.800	Small Dia. Dual Spring with Damper
PAC 1358	1.645	1.195	0.871	0.635	350 @ 2.150	1004 @ 1.200	688	1.130	0.950	Triple Spring - Bracket race
PAC 1349	1.645	1.195	0.871	0.635	385 @ 2.200	1074 @ 1.200	689	1.130	1.000	Triple Spring - High Lift
PAC 1350	1.645	1.195	0.871	0.635	440 @ 2.200	1129 @ 1.200	689	1.130	1.000	Triple Spring - Pro Stock/ Top Fuel
PAC 1351	1.667	1.195	0.871	0.635	450 @ 2.300	1240 @ 1.250	752	1.160	1.050	Triple Spring - Pro Stock
PAC 1352	1.681	1.195	0.871	0.635	480 @ 2.300	1315 @ 1.250	795	1.190	1.050	Triple Spring - Pro Stock
PAC 1353	1.695	1.195	0.871	0.635	500 @ 2.300	1500 @ 1.200	900	1.140	1.100	Triple Spring - Pro Stock
Next generation springs feature all of the material & processing features of the 1300 searies with smaller diamters for minimal weight increased valve train stability & high RPM's
PAC 1354	1.550	1.050	N/A	0.726	425 @ 2.300	1440 @ 1.300	1015	1.230	1.000	Dual Pro stock Intake Spring
PAC 1355	1.500	1.050	N/A	0.726	420 @ 2.175	1200 @ 1.175	780	1.130	1.000	Dual Pro Stock Exhaust Spring
PAC 1356	1.500	1.050	N/A	0.726	300 @ 2.100	1002 @ 1.200	780	1.130	0.900	Dual Drag Spring
PAC 1357	1.500	1.050	N/A	0.726	375 @ 2.150	1116 @ 1.200	780	1.130	0.950	Dual High lift
PAC 1360	1.522	1.050	N/A	0.726	400 @ 2.250	1252 @ 1.300	895	1.190	0.950	Dual High lift - Short version 1354
PAC 1362	1.725	1.225	0.871	0.635	475 @ 2.300	1515 @ 1.200	945	1.134	1.100	Triple Spring - Pro Stock
PAC 1363	1.725	1.225	0.871	0.635	525 @ 2.350	1565 @ 1.250	945	1.134	1.100	Triple Spring - Pro Stock

Endurance Springs

Part #	Spring Diamters				Spring Loads		Spring Rate	Max Coil Bind	Max Lift	Comments
	OD Outer	OD Outer	Damper	OD Inner	Installed Height (Valve Closed)	Open Load (Valve Open)
PAC 1385	1.564	1.150	Yes	0.744	250 @ 2.000	670 @ 1.200	525	1.140	0.800	Dual spring with damper for high lift roller applications
PAC 1395	1.574	1.150	Yes	0.744	265 @ 2.000	705 @ 1.200	550	1.150	0.800	Dual spring with damper for high lift roller applications