* Specific Edelbrock RPM Head Part Number: Edelbrock makes several variations of their RPM heads, and the bolt pattern and recommended torque may vary slightly.
* Head Gasket Type: The type of head gasket used (e.g., composite, MLS) will influence the torque procedure.
* Head Bolt Material: The material of the head bolts (or studs) will determine their yield strength, and thus the torque specification.
* Manufacturer's Instructions: The *most crucial* source of information is the instructions that came with *your specific* Edelbrock RPM heads. These instructions will give the correct torque sequence and values for your particular setup.
Where to Find the Correct Information:
1. Edelbrock's Website: Check Edelbrock's website. You might find installation instructions for your specific head part number as a PDF download.
2. Edelbrock's Tech Support: Contact Edelbrock's technical support directly. They will be able to provide the correct information based on your head part number and other engine specifications.
3. The Instructions that Came with the Heads: If you purchased the heads used, try to find the original instructions.
General Guidance (But NOT a Substitute for the Manufacturer's Instructions):
While I can't give you the exact torque pattern, it's generally accepted that head bolt tightening for most engines follows a phased approach:
* Initial Tightening: A low torque value to seat the head gasket.
* Intermediate Tightening: A higher torque value to further compress the gasket.
* Final Tightening: The highest torque value, often done in stages using a specific pattern (e.g., crisscross or a specific sequence numbered in the instructions).
Always use a calibrated torque wrench and follow the manufacturer's instructions precisely. Improper tightening can lead to warped heads, blown head gaskets, or other serious engine damage.
