Editing Vortec L31 cylinder head (section)
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===Small port Vortec head === * p/n 25534351 (bare) * p/n 25534421 (assembled) ;Based on info from GMPP<nowiki>:</nowiki> GM Performance Vortec small port Bowtie cast iron cylinder heads are machined for 2.00" intake valves and 1.55" exhaust valves and have bronze valve guides. Combustion chamber volume is 66cc nominal, deck surfaces are 0.450" thick, and port volumes are 185cc intake and 65cc exhaust. The valve cover rails are machined for both perimeter and '86-up centerbolt style valve covers. These heads are machined for 3/8" screw-in rocker arm studs, and have valve spring pockets machined for larger than stock (1.25") SBC springs, and will accept up to 0.530" lift camshafts without modifications. They are identified with the Bowtie Emblem on the exterior of the head, below the exhaust flange, and the Vortec logo on top of the intake port area. They also feature the GM logo cast into the bottom of the intake ports.
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