Re: LS-7 #990 head
It funny that you mention that,because I always thought that the 188 head was the later 990 head,but I went on to Mortec while I was posting yesterday to see if they showed the 188 head as being gen V or VI compatable and it showed the 188 head as the early head and the 088 head as the later one.so thats what I posted,but maybe I should have followed my gut on this one.I have a GMPP book from the late 90's that I can check sometime next week,but I was pretty sure it has the new 990 head as being the 188 head.You engine sounds like a 9.25:1 454,and I like to use that combo for street/strip engines,I call it the 2399 shortblock in reference to the TRW number for those pistons.One of my secret street combos is the GMPP 110 cc roval head on a zero deck 461 with those pistons,and it is a setup that spanks all the 502's around town.The LS6 pistons have another good feature,and that is that the dome isnt too big on the exhaust side of the chamber,so you can still run a fairly stout cam even if you whack the 118cc heads to get more compression.With the cam you claim to have you could whack those heads .040" and zero deck the block at the next rebuild and have close to 10:1.The #445 block isnt a "true" LS6 block in the sense that it isnt one of the notoriously thick castings,but it will serve you well up to .060" overbore,and some can go a bit more.The hot LS6 crate to have was the mid 70's#289 blocks,and they would bore way out there.By the late 80's,the LS6 crate motor was just a stepping stone to the 454HO crate motor that was to come,but it is still a great street peice.I will let you know if I find the information I was loking for on those heads.
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