Page 211 - 2020-2021 Racecar Engineering Drag Racing Parts and Accessories Catalog

2020 DRAG RACING

Rocker Arm Studs GM LS Valve Spring Kits
Choose from three different series of rocker studs. Designed exclusively for popular GM LS
High Energy and Magnum rocker studs work well with engines, kits are for use with hydraulic
moderate valve lift and spring pressures. The Hi-Tech Race studs are ideal roller or some solid roller camshafts
for high-RPM roller cam-equipped race cars. and include a carefully selected set of
Base Thread Stud Stud performance valve springs, retainers, locks, seals, and spring seats.
Part No. Description Size Length Size Length
Part No. Description Application
COM4500-16 High Energy Studs 7/16" .680" 3/8" 1.750" COM528-KIT Thumpr Valve Spring Kit Hydraulic Roller Including COM54-703-11
COM4501-16 High Energy Studs 7/16" .750" 7/16" 1.750" COM26918CS-KIT Beehive Valve Spring Kit Hyd. Roller/.625" Max. Lift
COM4502-16 Magnum Studs 7/16" .680" 3/8" 1.750" COM26925TS-KIT Dual Valve Spring Kit Hyd./Solid Roller/.660" Max. Lift
COM4503-16 Magnum Studs 7/16" .750" 7/16" 1.750" COM26926TS-KIT Dual Valve Spring Kit Hyd./Solid Roller/.675" Max. Lift
COM4504-16 Magnum Ford Studs 5/16" .680" 3/8" 1.750"
COM4505-16 Hi-Tech Race Studs 7/16" .680" 3/8" 1.750"
COM4512-16 Hi-Tech Race BB Chevy 7/16" .750" 7/16" 1.900" Valve Spring Compressor For GM LS
COM4514-16 Mark V/VI BB Chevy 3/8" .750" 7/16" 1.900" COM5462
COM4542-16 † Magnum Dodge/Olds 5/16" .580" 3/8" 1.520" Easy-to-use Valve Spring Compressor is
†Must be used with guide plates.
designed exclusively for use on GM LS
engines. Tool allows removing one or two
Rocker Arm Adjusting Nuts
valve springs at a time with the heads
Alloy nuts provide ultimate strength and lock- installed or off of the engine.
ing force. Stud girdle poly locks are ground
for minimum runout and tapered for extra strength in the locking area.
GM LS Valve Spring Shims
Part No. Description Stud Size
COM4508-16 Stud Girdle Adjusting Nuts 7/16" Used to set the desired installed height, shims are engi-
COM4508S-1 Stud Girdle Adjusting Nut With Snap Ring 7/16" neered for GM LS engines that include 1.300" OD valve
COM4509-16 Stud Girdle Adjusting Nuts 3/8" spring pockets and .520" valve guides. Offered in .015",
COM4510-8 BB Chevy Intake Stud Girdle Adjusting Nuts 7/16"
COM4600-16 Hi-Tech Polylock For Aluminum/Stainless/Pro Magnum Rockers 7/16" .030" and .060" thicknesses. Sold in packs of 16.
COM4601-16 Hi-Tech Polylock For Aluminum/Stainless/Pro Magnum Rockers 3/8" Part No. Description
COM4602-16 Magnum Polylock 3/8" COM4717-16 Valve Spring Shims, .015" Thick
COM4603-16 Magnum Polylock 7/16" COM4763-16 Valve Spring Shims, .030" Thick
COM4604-16 High Energy Polylock 3/8" COM4788-16 Valve Spring Shims, .060" Thick

Beehive Valve Springs
Single Beehive Valve Springs offer more RPMs, added horsepower and increased durability. Springs eliminate damaging harmonics, provide increased
valvetrain efficiency, and allow use of smaller, lighter retainers. Well suited to street/strip or mild drag race applications. Sold in sets of 16.
OD ID Load @ Checking Height Load @ Open Height Coil Bind Matched Retainers Lock
Part No. In. In. Lbs. In. Lbs. In. Ht. In. Steel Titanium Angle
COM26056-16 1.454" .731" 160 1.800" 420 1.150" 1.100" COM703 COM785 10°
COM26113-16 1.061" .738" 93 1.570" 198 1.020" .952" COM700 COM702 7°
COM26120-16 1.445" 1.000" 155 1.880" 377 1.280" 1.230" COM795 COM794 10°
COM26125-16 1.101" .650" 120 1.640" 275 1.040" .970" COM700 COM702 7°
COM26906-16 1.282" .655" 92 1.800" 304 1.250" 1.181" COM774 COM772 7°
COM26915-16 1.290" .885" 105 1.800" 293 1.200" 1.085" COM774 COM772 7°
COM26918-16 1.290" .885" 130 1.800" 318 1.200" 1.085" COM774 COM772 7°
COM26981-16 1.240" .650" 110 1.700" 292 1.175" 1.115" COM787 — 7°
COM26986-16 1.412" 1.000" 123 1.750" 284 1.175" 1.040" COM787 — 7°
Single Outer Valve Springs
OD. ID Load @ Checking Height Load @ Open Height Coil Bind Matched Retainers Lock
Part No. Description In. In. Lbs. In. Lbs. In. Ht. In. Steel Titanium Angle
COM901-16 Outer Spring With Damper 1.494" 1.040" 101 1.650" 242 1.250" 1.160" COM740 COM730 10°
COM910-16 Outer Spring With Damper 1.354" .940" 85 1.850" 275 1.350" 1.280" N/A N/A N/A
COM911-16 Outer Spring With Damper 1.525" 1.035" 122 1.900" 306 1.400" 1.200" COM741 COM732 10°
COM926-16 Outer Spring With Damper 1.475" .992" 108 1.800" 316 1.300" 1.140" COM740 COM730 10°
COM936-16 Outer Spring With Damper 1.539" 1.055" 149 1.900" 325 1.350" 1.225" COM741 COM732 10°
COM940-16 Outer Spring With Damper 1.464" 1.025" 89 1.900" 232 1.300" 1.200" COM740 COM730 10°
COM941-16 Outer Spring With Damper 1.260" .876" 135 1.750" 359 1.250" 1.130" COM750 COM728 10°
COM942-16 Outer Spring With Damper 1.437" .974" 115 1.700" 284 1.200" 1.125" COM747 COM730 10°
COM972-16 Outer Spring With Damper 1.460" 1.010" 125 1.800" 308 1.250" 1.195" COM740 COM730 10°
COM975-16 Single Inner Spring .953" .697" 55 1.500" 127 1.000" .950" N/A N/A N/A
COM980-16 Outer Spring With Damper 1.230" .821" 91 1.700" 229 1.250" 1.260" COM742 COM728 7°
COM981-16 Outer Spring With Damper 1.254" .820" 105 1.700" 295 1.250" 1.150" COM742 COM728 7°
COM983-16 Ovate Spring 1.250" .836" 105 1.700" 310 1.200" 1.150" COM751 — 10°
COM984-16 Outer Spring With Damper 1.430" 1.010" 94 1.750" 219 1.250" 1.150" COM740 COM730 10°

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