stuck_on_stupid

iTrader: (5)

hello I have a question. I hope im in the right section. I was looking for some ls3 heads for my build im doing and came across this . i am selling my 821 ls cylinder heads. these have been completely rebuilt with all new seats, seals, ls9 intake valves, ls7 springs, retainers, keepers, ls7 rocker arm set up. i also have brand new .051 mls head gaskets. these heads work on any ls engine with a 4 inch bore or larger. perfect for turbo, supercharger or nitrous. asking $950.00 for everything. serious calls only!!. can ls7 rockers fit on ls3 heads. im being told they cant. is he telling the truth? should I pick these up? also this is my first build. new to building motors. this will go on a lq4

Gunslinger09

Nope the LS7 rockers will not work. The 4inch bore of the LQ4 will barely accommodate the LS3 style heads.

A.R. Shale Targa

iTrader: (2)

As you state the 4" bore barely unshrouds a 2.165" intake valve and the OP
says the heads have the LS9 2.20" intakes....plus an LQ4 with the dished
pistons will be low on compression compared to the LQ9 flat-tops. Certainly
less than ideal.