Best to know which vehicle carried which engine. The LQ9 would be found in Cadillacs, Silverado SS, Silverado/Sierra HO and Silverado/Sierra VortexMax. The LQ4 is a bit tricker but pretty safe in the 2500 and 3000 class pickups and anything in Denali.
I would recommed you type in LS or Vortec into Wikipedia and do some research. I would like to say that all of the "newer" GM engines are part of the LS family and share many components. The LS1,2, 3....and such, became infamous as performance engines but are the "car" version of the 8 cylinder while all the other 8 cylinders are truck versions and come in many configurations.
so other then compression they are the same? how do they the up compression?different heads or different pistons? or both? im going to swap heads on the engine so if thats how they did it i guess the easier to come by lq4 would be the rote to go? i also want to run a procharger or to sell the D1SC i have and go turbo but that wont be untill after i get it in the car and running. its also going to be a carbed setup.
I would guess pistons as I would bet the heads are the same. I could be totally wrong about that though....The LQ4 should be more abundant and less expensive so good choice there. Cams on all of these truck engines are pretty mild so minus intake (you're going carb so this wouldn't apply) it would be your best, and easiest, bang for the buck.
My standard disclaimer applies here "I could be totally wrong" but the bottom ends are identical and I don't believe there has be any bad year compared with any other years. I would concentrate on finding the lowest milage engine and go from there.
ok thanks guys lq4 it is, im looking to get an engine to drop in to a 86 mustang. i want to get all the parts and do the entire swap in the spring(if not sooner). how strong are the stock parts? crank rods pistons? ive heard i should change out the rod bolts. what about main bolts?
the funds are a problem haha this is a tight budget build. but with out skimping. i would like to make it a 10.0 car. im thinking about boosting it i had a D1SC on my truck(dakota)and loved it and i still have the d1sc and have to find out if it will work on a 6.0 with just a reclock.
I was planning on upgrading rod bolts. Just going to be ported heads, fast 92mm ported intake and cam. Have performa built 4l60e and 4600 stall level 2, full lengh kook headers 8.8 with 3.73s maybe 100 shot later on. Does any one no someone that can spec out a cam to run with my combination.
My heads are patriot performance with 2.05 intake valves and has 64cc chambers 227c runners. Any one have ideas for cam to run drive ability not as important as overall performance on the strip. Will b LQ4 short block