12bolt Tom

09/04/2026

Sub par products, has anyone else had this problem not knowing what caused it?

08/11/2026

Been working on this project a while. New roller rocker arms for Chevy inline 6. They are normally bulky and not fit under a stock valve cover or work with stock studs or pushrods.
These were developed to cure that.
These are made to use with:

1 stock valve cover

2 stock 3/8 studs

3 stock pushrods

Lift is limited to .530 These are not made for BIG pressure springs

Works with our Performance spring kit and .550 springs

USA Made High Quality Roller Rockers

1.75 ratio for Chevy Inline 6 cylinder

For use on 3/8 stud press in type (factory style)

Under cut trunion for large springs

Relieved near pushrod for clearance.

High strength aluminum body

Large diameter trunion bearings for long life.

Front/rear rocker radiused to help clear valve cover.

Set of 12

If bigger lift is needed, use our 7/16 stud rockers

The internal baffle in valve cover will need to be squished in the middle slightly.
https://www.12bolt.com/store/p1462/Roller_Rockers_1.75_Harlan_Sharp_3%2F8_STUD_Chevy_153_250_292.html

08/10/2026

New batch cleaned up. Let's get busy making chips

08/05/2026

My good friend Ron Porcelli stopped by today. Driving his one of a kind 55 Chevy . 292 powered. Blown and injected.

05/07/2026

Loaded up. 5 292 and 3 250.

04/19/2026

This is just a beginning Dyno pull. Before carb adjustments were made . As tested was 300plus hp

04/19/2026

04/07/2026

Need help. Need positive identification of this intake manifold. 12Bolt decals delivered to the helper. Notice the angle on the head/intake fl**ge and 6 ports.

04/03/2026

Setup for the open house. Hope to see you guy's tomorrow.