Page 207 - 2018 Racecar Engineering Drag Racing Parts and Accessories Catalog

Rocker Arm Studs GM LS
Choose from three different series of Valve Spring Kits
rocker studs. High Energy and Magnum rocker studs work well Designed exclusively for popular GM LS engines, kits are for use
with moderate valve lift and spring pressures. The Hi-Tech Race with hydraulic roller or some solid roller camshafts and include
studs are ideal for high RPM roller cam-equipped race cars. a carefully selected set of performance valve springs, retainers,
Base Thread Stud Stud locks, seals and spring seats.
Part No. Description Size Length Size Length
COM4500-16 High Energy Studs 7/16" .680" 3/8" 1.750" Part No. Description Application
Hyd. Roller/.625" Max. Lift
COM4501-16 High Energy Studs 7/16" .750" 7/16" 1.750" COM26918CS-KIT Beehive Valve Spring Kit Hyd./Solid Roller/.660" Max. Lift
COM26925TS-KIT
Dual Valve Spring Kit
COM4502-16 Magnum Studs 7/16" .680" 3/8" 1.750"
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" Valve Spring Compressor
COM4507-8* Hi-Tech Race BB Chevy 7/16" 1.680" 7/16" 2.000" For GM LS COM5462
COM4512-16 Hi-Tech Race BB Chevy 7/16" .750" 7/16" 1.900"
COM4514-16 Mark V/VI BB Chevy 3/8" .750" 7/16" 1.900" Easy-to-use Valve Spring
COM4542-16 † Magnum Dodge/Olds 5/16" .580" 3/8" 1.520" Compressor is designed
* Designed to be used on exhaust for aluminum heads. † Must be used exclusively for use on GM LS
with guide plates.
engines. Tool allows removing
one or two valve springs at a
Rocker Arm Adjusting Nuts time with the heads installed or
Alloy nuts provide ultimate off of the engine.
strength and locking force. Stud
girdle poly locks are ground for GM LS Valve Spring Shims
minimum runout and tapered for Used to set the desired installed height, shims are
extra strength in the locking area. engineered for GM LS engines that include 1.300”
Part No. Description Stud Size OD valve spring pockets and .520” valve guides.
COM4508-16 Stud Girdle Adjusting Nuts 7/16" Offered in .015”, .030” and .060” thicknesses. Sold
COM4508S-1 Stud Girdle Adjusting Nut With Snap Ring 7/16" in packs of 16.
COM4509-16 Stud Girdle Adjusting Nuts 3/8"
COM4510-8 BB Chevy Intake Stud Girdle Adjusting Nuts 7/16" Part No. Description
Hi-Tech Polylock For Aluminum/Stainless/ COM4717-16 Valve Spring Shims, .015” Thick
COM4600-16 7/16"
Pro Magnum Rockers COM4763-16 Valve Spring Shims, .030” Thick
Hi-Tech Polylock For Aluminum/Stainless/ COM4788-16 Valve Spring Shims, .060” Thick
COM4601-16 3/8"
Pro Magnum Rockers
COM4602-16 Magnum Polylock 3/8"
COM4603-16 Magnum Polylock 7/16"
COM4604-16 High Energy Polylock 3/8"
Beehive Valve Springs
Single Beehive Valve Springs offer more RPMs, added horsepower and increased durability. Springs eliminate damaging harmonics,
provide increased valvetrain effi ciency and allow use of smaller, lighter retainers. Well suited to street/strip or mild drag race applica-
tions. 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°
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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