Pontiac 350 HO #48 heads, porting marks?

1 year ago
27
1968 Firebird 350 HO Firebird 400 Firebird 400 HO classic cars hotrods

Wondering if others have noticed similar porting marks on Pontiac heads, also #48 heads us two types of valve angles, 2.11 (intake) 30° and the exhaust are 45° (1.77).

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