Home - Return to Previous Page
Additional Images

Press In Stud Conversion Service, to 7/16 Screw In Studs, Pontiac Cast Iron Heads, Set/2 1100H-STUD-CONV

Cast Iron Heads Stud Conversion Service(Set/2)
Customer supplied heads sent to us for machining services
Convert press in studs to Pontiac 7/16 screw in studs
Pricing: $245.00

Customize Your Item

- Choose Head Shipping Options -
 * required
- Choose your head milling -
 * required
- Choose your studs -
 * required
- Choose Guide Plates -
 * required


This conversion service is for converting press in studs to 7/16 screw in studs. The press in studs are much weaker than the screw in and can be pulled out when running a performance cam. Previously the only option was to pull studs and tap to 1/2" and use an aftermarket 1/2" stud that had to be cut down due to excessive length. Now we can perform the services so your heads have stronger factory style screw in studs.

Steps for the conversion

We clean heads and pull existing studs if needed

Our CNC program will precisely measure the exact stud location

It will mill the boss height when needed for use with or without guide plates on 389/421 heads

The boss is milled lower to accommodate the screw in 7/16 stud with the hex bottom.

The hole is enlarged by precisely boring it to the proper size

It is then thread milled

Helicoil inserts are installed that accepts the 7/16 screw in stud


For 67 and later/ 14 degree heads you can use stock guide plates or CCA-4851-8


If you need other head services or parts contact us after ordering and we will be glad to get you a full quote before shipping to us.

We can even arrange to ship your heads Butler for the CNC Head Porting Services.

Choose one of the options for shipping to us.

Return shipping will be automatically calculated at checkout. Shipping option to us is only for Cont. US only


Heads will be inspected and we will contact you if any optional services are recommended



Shipping Information

  • Item Requires Shipping
  • 125.0 lbs.
  • This item ships in its own box.

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.