The Cylinder Head Specifications;
Casting # 2658920
* The heads were milled, to achieve a 57.3 CC 'combusuon chamber volume'.
* Martin-Wells (Well-Tite) 'hardened seats' were installed.
* Bronze Valve Guides
* The intake and exhaust ports were 'gasket/port' matched, and the high-spots 'casting flashes' were removed.
* No porting, other than 'only' going a 1/4" depth into the port for 'smooth-transition' blending.
* Minor 'rounding/blending' at the 'valve guide boss' inside the 'bowl area'.
* Intake Ports were equally matched to a 131 CC 'volume'. (4 CC's over 'stock' measurement)
* Exhaust Ports were equally matched to a 64 CC 'volume'. (4 CC's over 'stock' measurement).
* Intake 'Valve Seats' were cut '5-Angles' == 70* - 60* - 45* - 37* - 20*
* Exhaust 'Valve Seats' were cut '5-Angles' = 70* - 60* - 45* - 30* - 15*
*Seat Width = .040" Intake ~ .060" Exhaust
* All 'sharp edges' were radiused, and smooth-sanded with 400 Grit Wet-Dry Sandpaper,
while using a light film of Marvel Mystery Oil as a lubricant.
* Valves are Ferrea #5000 Series 'stainless steel'. 'High Performance Street/Strip Series' with 'swirl polish finish'.
* Intakes = 1.78" with 3/8" Stem
* Exhaust = 1.50" with 3/8" Stem
* Valve Angles = 45* with a 30* back-cut (.025" wide) on the Intake Valve
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Note; We didn't want to perform a 'full blown' Port & Polish Job on the Cylinder Heads, as we wanted to see what
we could get performance-wise out these heads.
Note; A 'gasket/port' match was neccessary, and 'rounding/blending' of the valve guide boss was required, to
promote a smooth flow and to increase the port velocity on these relatively stock port cylinder heads.