LTX402

Got it dynoed last month made 534/508 on e50 and on 93 it made 518/490. We never got it higher than e50 on the dyno because i came with too much 93 in the tank but i suspect theres not much power left between e50&e85. I put the gm performance truck intake on before going it needed to be modified some to work with the lt2 intake and lt5 tb. Overall im very happy with the numbers but coming from a turbo setup to this was somewhat underwhelming because of the stock converter the truck gets out of the hole hard but nothing like the old turbo setup.. nothing a 3600 stall shouldnt help ive got it sitting in my garage waiting to be installed. with the tight converter this setup ran 12.3 at 113 with a 1.87 60’.. the old turbo setup ran a 11.49 at 120 mph with a 1.71 60’. The turbo setup was able to stall the zl1 converter much higher being that the torque was instant when building boost on the brake. I look for this setup to run about an 11.9 at 116 and a 1.7 60’ once the converter is in.. we shall see.. still great times for a stock motor with just a cam and boltons im very satisfied with it. Ps the burnouts are much more vicious in the na setup for some reason

Stay tuned i plan on getting an lt4 blower but not gonna run a crazy amount of boost probably just enough to make about 650 wheel like my turbo setup was. It took 14 psi on the 5.3 with an lt5 cam It will probably only take 5-6 psi on this setup with the cam and all the displacement. As of now its running very good cant get on a dyno until december so still on 93 only but i smoked a scatpack last weekend so its making some decent power already just dont know exactly how much

Got the truck running the same weekend i made my last post… Its on a basemap my tuner made but it drives suprisingly well already its very snappy and powerful already as well. As far as i know after talking with btr im the only person to use the 225 cam with the oem zl1 6 speed converter. It surges just the tiniest bit when coming to a stop but i expect that will be cleaned up once it goes on the dyno I also expect it to feel even more powerful once its got a full tune and its on e85

Been a while since i replied… You all are wrong while it was designed off the lt2 cam it is not the same and has considerably more duration than the normal lt2 cam. Also the lt2 cam has afm the l8p cam does not.. With that being said I wasnt able to keep waiting around for it to drop i went with the btr 225 cam instead. Should make better power but wont have the poor mans l8p i had oh well will be evn rowdier. Engine is going in this weekend. Final Setup will be l8t btr 225 cam btr pushrods btr 660 springs che trunion kit lt2 intake manifold lt5 tb 4” custom intake speed engineering longtubes 3.5” custom exhaust and a udp underdrive pulley will be on e85 should clear 500 wheel na

Yea there are actually a set of gm cnc heads from the hot cam package that id like to use maybe next year when i have a little more budget to work with.

Longtube headers L86 or lt2 manifold anything is better than the l83 manifold LT5 throttlebody underdrive pulley if youre willing to spend ported head money just boost it

Yea theyre the same as the lt1/2/l86 the only difference between those heads and the l8t heads are the springs. The l8t uses the same weaker springs as the l83 because they use the same cam. Im going to be using much nicer springs in my poormans l8p though .660 dual platinums along with some chromoly pushrods i plan to rev it higher than they reved the actual l8p being that mine will have the lt2 intake lt5 tb a monster intake pipe and longtubes. I expect it to make about 500 whp on e85. Should be nice and tame im coming off a 650whp turbo l83 build

I just bought an l8t for 4k when im done mechanically it will be an l8p. Going to be using the following in it: l8p cam Tsp .660 dual platinum valve springs with titanium retainers Tsp Hardened pushrods CHE trunion upgrade Lt2 intake manifold Lt5 tb 4” cai 1 7/8” Longtubes 15% underdrive pulley flex fuel sensor. Mind you the l8p put down 523 to the crank on 91 with the truck manifold and headers Im hoping for im hoping to make another 100hp to the crank with the extra mods and e85 ill post results when its finished

factory plugs work but youll have to port the snout of any manifold you put it on to allow the blade to open all the way

ah i see im not really familiar with nitrous but i know plenty of people dont like using plastic manifolds with it while others have no issue at all using them

thatll work my man thats what gwatney reccomends you do if you go to a larger tb i know of a guy with the lt2 manifold with a 103 mm tb and a 200 shot of nitrous so they must be able to withstand some torture

l86 87mm. wanted to go with the lt5 but gwatney said porting it wasnt a good idea with boost because the remaining material was so thin

contrary to what all the know it alls with stock trucks above say it performs about the same as the l86 manifold from what i can tell on the butt dyno the only noticeable difference is the vacuum it pulls on the boost gauge. Truck still fries tires through 3rd gear