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-   -   NEW GMPP VORTEC heads !! (

terror385 07-11-2004 09:26 AM


check this :D


SB Chevrolet Bare Large Port Vortec Bow-Tie Cylinder Head

GM Performance Parts' latest and most powerful iron cylinder head 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.


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 25534351C.

Complete Large Port (206 cc) Vortec Bow-Tie Cylinder Head
Price: $539.95

Bare Large Port (206 cc) Vortec Bow-Tie Cylinder Head
Price: $293.95

Complete Small Port (175cc) Vortec Bow-Tie Cylinder Head
Price: $499.95

Bare Small Port (175cc) Vortec Bow-Tie Cylinder Head
Price: $269.95

coldknock 07-11-2004 09:48 AM

Well ain't that just dandy, I was looking for a set of heads a little while back. Before my engine decided to grenade.

I'd wait for someone reputable to publish accurate flow numbers from those heads before I spent $1100 on a set. Don't even come with rocker studs.

On the other hand they would probably work very well on one of those HT383 shortblocks. I wonder they'll put the two together as a package.


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