SUPA BAD Posted July 23, 2004 Report Share Posted July 23, 2004 Does the 4.9 v8 have a conventional cooling sytstem if it does the the new GM performance VORTEC heads will fit im not sure about the VORTEC manifold but the heads will fit IF it is cooled by a conventional system. If its reversed then there is no hope. It might add up to 30 more hp. Link to comment Share on other sites More sharing options...
Randy_W Posted July 23, 2004 Report Share Posted July 23, 2004 Vortec heads fit traditional small block Chevys, period. They won't work with LT-1's, LS1's or any Cadillac derived motor. Link to comment Share on other sites More sharing options...
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