1966 1967 1968 1969 1970 1971 1972 1973 1974 ALL BOWTIE HEAD

Part Number: 25534351

ALL  BOWTIE HEAD - Part Number 25534351
Bowtie Head Small Port Vortec Bare. GM performance parts most powerful bare cast iron cylinder head for street or racing applications features revised intake and exhaust ports and includes 2.00-inch stainless intake valves P/N 25534407 and 1.55-inch stainless exhaust valves P/N 25534408. Deck surface thickness is 0.450-inch with 66-cc combustion chambers, 185-cc intake and 65-cc exhaust ports. All Vortec intake ports are taller and narrower than early model Chevrolet heads. Valve cover mounting hole accommodate both early perimeter-style and newer center-bolt mount. Intake mounting holes accommodate early six-bolt and newer four-bolt Vortec-design intakes. Head includes screw-in rocker studs P/N 12552126 and large valve pocket machining. It will accept up to .530-inch-lift camshafts without modifications. Head assembly includes valve springs P/N 1551483, valve seals P/N 10212810, and spring caps P/N 10212808. Note: Must use raised runner design intake manifold (six-bolt style) or Vortec design (four-bolt style). Use with Vortec intake gaskets P/N 12529094 or dual-pattern intake gaskets P/N 12497760 for early model raised runner or Vortec intake manifolds. GM Performance Parts cylinder heads are created with GM premium-engineering, then cast and machined to our exacting manufacturing standards. GMPP cylinder heads are available as bare castings or complete cylinder head from service replacement castings to all-out competition applications.
Small Port Vortec Bare 1966 1967 1968 1969 1970 1971 1972 1973 1974

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