www.TAPerformance.com does not yet show anything on their web site but word is that the first two sets have been through first machining. programs are still being fine tuned.
the new head will support a 2.050" intake valve and a 1.600" exhaust. yes, you read that right, a plus 2" intake valve into the stock 350 piston bore. unknown if it will be necessary to fly cut the top of the bore to relieve shrouding.
final head weight is not known ( and, obviously, more porting will take more weight off ) but the raw casting is 30lbs vs the factory cast iron at 51lbs. delta of 21lbs per head * 2 == 42lbs saved AND THAT IS A MINIMUM. this is BEFORE machining, so the finished heads will be lighter yet.
couple that with an aluminum Stage 1 intake which is 16lbs vs the stock cast piece at 53lbs for a 37lbs savings and that will REALLY drive the assembled weight of the 350ci to rock bottom levels.
then you take the exhaust manifolds off and put headers on and save even more!
so the full assembly will be *a minimum* of 80lbs lighter than the factory OEM engine.
Buick small block engine weights
350ci == 460lbs
340ci == 404lbs
300ci == 400lbs
215ci == 328lbs
350ci short block + aluminum heads and intake == 380lbs assembled? noice!