EMPI Super Vee Type 4 Stock Plus Heads — 94–96mm, 44/36mm SS Big Valves, Pair | VW Bus & Porsche 914 (98-5321-0) sub-fuel-lines What's the difference between the

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EMPI Super Vee Type 4 Stock Plus Heads — 94–96mm, 44/36mm SS Big Valves, Pair | VW Bus & Porsche 914 (98-5321-0) sub-fuel-lines What's the difference between theEMPI Super Vee Type 4 Stock PLUS Cylinder Heads 94 96mm Bore, 44 36mm Manley SS Big Valves, Pair (98 5321 0) The Stock PLUS variant of the EMPI Super Vee Type 4 cylinder head runs the same proven European sourced casting as the Stock version, but adds upgraded 44mm intake valves for better breathing on more aggressive Type 4 builds. Each head is stuffed with Manley valves, silicon bronze valve guides, hardened valve seats, heavy duty valve springs,