25534431 Vortec Bow-Tie Large Port Cylinder Head, Complete
GM Performance Parts' latest and most powerful iron cylinder head with "Large Port" for Street or Racing. This Vortec design Special Performance cast iron cylinder head features revised intake and exhaust ports and includes 2.00" hollow stem intake valve P/N 12555331 and 1.55" sodium filled exhaust valves P/N 12551313. The deck surface is .450" with 65 cc combustion chambers, 206 cc intake and 77 cc exhaust ports. All Vortec intake ports are taller and narrower than early model Chevrolet heads. The valve cover mounting holes are for both early model flange and late model center. This head also includes intake manifold mounting holes for both early model 6 bolt main and late model 4 bolt Vortec design. The head has screw in rocker studs P/N 12552126, large valve spring pocket machining, and will accept up to .530" lift camshafts without modifications. Heads are identified with the Bow-Tie logo on the exterior of the head below exhaust flange and Vortec logo on top of intake port area. They also feature GM logo cast into bottom of intake ports. Includes valve spring P/N 12551483, valve seal P/N 10212810, and spring cap P/N 10212808.
Technical Note: You must use a raised runner design intake mainifold P/N 10051103 (6 bolt mounting), or Vortec design 12366573, 12496820, 12496821, 12496822, and 12499371 (4 bolt mounting) with this head. You can use production Vortec intake gaskets P/N 12529094 (torque spec. 11 ft-lb/ 15Nm) for mounting Vortec design heads or use P/N 12497760 (torque spec. 30 ft-lb) with conventional material when using on early model raised runner or Vortec design intake manifolds, this gasket has both 6 bolt and 4 bolt Vortec attaching holes. Head casting P/N 25534371C.

 

looks like a cast iron version of the vortec "fast burn" heads. price?

 

www.gmpartsdirect.com has them for $457 each. That's only $915 for the pair. The kicker is, they want nearly $200 for shipping and handling. Still probably cheaper than your local GM dealer.

 

kinda steep. for that price you can pickup some AFR's for a little more. i was hoping they were less.

L31 vortec's it is......... as soon as the HSR for vortec heads is out......

 

that amount ($457) is what the DEALER pays to get them.

GMpartsdirect is a dealer.

100% of the money they make is that "shipping and handling" minus the actual shipping cost.

note that its always the same percentage of the "price"

 

MrDude_1 - I understand that. I paid nearly $30 "S&H" for my GM t-top weatherstrip kit. But still, its much cheaper than your local dealer.