Chevy Performance 19417591 Features:

• 78cc D-shaped exhaust ports raised .200 in.
• .400 in. deck (can be milled up to .060 in.)
• No heat riser
• Raised, machined rocker rails
• New “time-serts” prevent oil migration through rocker studs
• Dual bolt patterns for perimeter-bolt and center-bolt valve covers
• Dual bolt patterns for Vortec and early-model intake manifolds

Chevy Performance 19417591 Notes:

• Requires angled spark plugs (5/8 in. hex, 3/4 in. reach, tapered plugs)
• Use head gaskets with stainless-steel fire rings
• Use intake manifold gasket 809-19301685
• Requires Fel-Pro exhaust gasket 375-1470 (may require minor trimming)

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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