CYLINDER HEADS - Pro-Port™ Raw & Semi-Finished Heads - Small-Block Chevy

VICTOR 23° PRO-PORT RAW HIGH-PORT - APPROVED FOR NASCAR TOURING CLASSES
61429
Chamber Size (a) Int. Port Dim. (b) Exh. Port Dim. (b) Valve Sizes in/ex. (c) Single HIP'd
48cc 1.17" x 1.87" 1.34" x 1.16" 2.24"/1.64" #77559* N/A

VICTOR 18° PRO-PORT RAW
Chamber Size (a) Int. Port Dim. (b) Exh. Port Dim. (b) Valve Sizes in/ex. (c) Single HIP'd
42cc 1.17" x 1.77" 1.50" x 1.33" 2.24" / 1.65" #77509* #775069*
52cc 1.16" x 1.79" 1.50" x 1.33" 2.24" / 1.65" #77519* #775169*

VICTOR 18° PRO-PORT RAW - WITH SEATS .100" CLOSER TO DECK (no seats & guides)
Chamber Size (a) Int. Port Dim. (b) Exh. Port Dim. (b) Valve Sizes in/ex. (c) Single HIP'd
36cc 1.18"x 1.77" 1.50" x 1.34" 2.24"/1.65" #77539* #775369*

VICTOR 15° PRO-PORT RAW
Chamber Size (a) Int. Port Dim. (b) Exh. Port Dim. (b) Valve Sizes in/ex. (c) Single HIP'd
32cc 1.17"x 1.80" 1.50" x 1.32" 2.24"/1.65" #77549* #775469*

ADDITIONAL SPECS FOR PRO-PORT RAW & SEMI-FINISHED HEADS
 Valve Position   
 
   
   Intake Pierce Point Exhaust Pierce Point        
Head Valve Angle Xiv Yiv Xev Yev Spacing Valve Seats Guides
61989 15° 0.820 0.024 1.090 0.024 1.910 Installed Installed
61999 15° 0.820 0.024 1.090 0.024 1.910 None Installed
(a) Unfinished size
(b) Dimensions at port entry/exit
(c) Maximum size (each valve; may not be used together)
(*) Not legal for sale or use on pollution controlled motor vehicles.
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