Conversion Kit Fits

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit    RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit

Set of (16) RAS3 studs and set of (16) poly locks from Spotts Performance. US MADE SCREW IN Studs and. These replace Press In Studs on 389 and 421 heads. Very Popular for 64-66 GTO's and Big car 421's.

High quality studs are 1/2 course thread at base and stronger then factory 7/16 threads at top. Heads will need machine shop to pull studs and tap to 1/2 thread. Do not hand tap your heads!!! Your studs may not be perfectly straight when installed. In the past, I've had to tap and heli coil for a 7/16 base thread, machine stud boss and then cut down the base of the screw in stud. To allow rocker arms to fit under stock valve covers. Studs do not have oil thru holes on certain pre 64 heads. Simply use rocker arms with oil hole (see may other auctions).
On oil thru stud applications. I also plug the block with 2- 1/8 npt pipe plugs at deck to keep oil away from heads. This set up will allow factory valve covers to fit! This kit is for all stamped steel rocker arms (factory with oil thru hole). And also roller tip rocker arms.
Some aluminum and stainless steel rocker arms will work as well. Not all aluminum rocker arms will allow the use of these poly locks. The item "RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit" is in sale since Wednesday, November 18, 2020. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Rocker Arms & Parts".

The seller is "fbpaul" and is located in Hatfield, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation, Ukraine, Cayman islands.

  • Interchange Part Number: Fits most all press in stud heads
  • Surface Finish: Silver Zinc plated Grade 8
  • Manufacturer Part Number: Grade 8 Conversion Screw in Stud
  • Country of Manufacture: United States
  • Part Brand: For Pontiac Press In Heads
  • Other Part Number: RAS3 and poly locks


RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit    RAS3 Pontiac 421 GTO 389 Screw in Rocker Arm Studs and poly locks Kit