2014 ARP Catalog

GETTING THE CORRECT ARP HEAD STUD/BOLT FOR THE APPLICATION

Today, there are literally dozens of different cylinder head and engine block combinations for the more popular applications, and new offerings coming out all the time. It is virtually impossible for ARP’s engineering staff to obtain detailed information from all of these various sources, so it may be necessary for customers to calculate exactly what they have so the correct cylinder head studs or bolts are used. Whether it’s a small block Chevy engine or a Honda VTEC, the procedure remains the same. The illustration on the right shows the nine differ- ent variables that come into play when determining the proper fastener for a particular position. Many cylinder heads have different column heights, etc. at various posi- tions, and additional variables come into play when using aftermarket engine blocks (some of which have “blind” tapped holes for attaching the heads that are shallower than OEM). It is therefore critically important that you determine exactly how many different bolt/hole combina- tions exist for the cylinder head installation. A. Depth of cylinder head counter bore_ ________________ B. Diameter (o.d.) of head counter bore _ _______________ C. Column height (net thickness of head) _______________ D. Diameter (o.d.) of bolt hole in head _________________ E. Head gasket thickness (uncompressed) _ ______________ F. Depth of counter bore in block _ ____________________ G. Length of thread in block _ ________________________ H. Depth of hole from surface to bottom _______________ I. Thread size and pitch _ ____________________________ FASTENER CALCULATIONS You must have the following data:

CYLINDER HEAD/BLOCK CROSS-SECTIONAL DATA

TYPICAL V8 & MOST 4-CYLINDER WITH 1 OR 2 DIFFERENT COLUMN HEIGHTS Column Height =

Column Height =

TYPICAL V8 WITH 3 DIFFERENT COLUMN HEIGHTS

Column Height =

Column Height =

Column Height =

Earnhardt Childress Racing R07

Bryan Fuller uses ARP hardware on all his custom rides

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