i just picked up the engine n tranny last night, but as many others b4 me it seems to be a lq4. i pulled the spark plug to check if the piston top was dished or flat but as i ran a screw driver over the top it kinda felt dished but on another board somebody had posted some pics of their flat lq9 pistons vs the dished lq4's and the ones look alot more like their flat lq9 pistons it "supposely" came out out of a 06 silverado ss truck, so it looks like im going to have to do a little bit more research to find out exaclty if i have a lq9 or lq4. I picked both tranny and engine up for $1500 if its not a lq9 i can always turn around and sell it. Iwill post pics later tonight.

i originally planned on going with a bb 454 that i intended on stroking to a 496, the reason for this was 1. i wanted a loud abnoxious chopping idle and 2 because i wanted the hit the magical 500hp mark.

As i did some research and asked a few questions i was assured by a few ppl that i could achieve my goals with a fuel injected motor, so since i found this deal i pulled the trigger. But now I am left with a few questions and hope that you guys can help me out figuring out the solution to my problem.

does any body know what it will take take to to get the
comp cam "Big ***** Thumpr' cam in there???? I know its a huge cam and there are better and easier ways to achieve my hp goal, but like most people in this world, id like to have my cake and eat it too. I definetly WANT to have a louuddddddddddd RUFFFFFFFF iddle but at the same time i would love to get on the gas peddle and know that i can hit 500 hp when i feel like it.
here are the cam specs


BIG *****’ THUMPR™ - Street/strip, needs 9.5:1 CR, 2800+ stall, intake, gears, & headers, very rough idle.
2600 to 6800

54-602-11
291THR9
291 311
235 249
.573 .558
109°


Is it feasable to reach 500 hp with this particular cam N/A?

would it be easier to just port out the stock 317 heads or to swap to the l92's to gain the extra horse power?

is it even possible to run this cam with the l92's???? any feed back would be greatly appreciated

(like i said i know they are other ways of doing it but i want the guaranteed sound and i would love to achieve the 500 hp call me hard headed)
______________

 

If you have the vin, there is an "n" in the 8th or 9th spot I believe.

 

a 500hp lq4 is cake. just swap in a cam (thumper cams arnt that great for power.), i consider either a custom grind (pat g) or a tsunami from TSP, or something simmilar. that particular cam has way too tight of an lsa for a fuel injected application, the exhaust duration is WAY too long. thats a 14* split, no where near ideal for a set of 317's.

for best power, i'd have the heads milled to get the compression up to around 11:1 if it isnt an lq9.

depending on what intake setup you're planning on running, 430 - 440 to the wheels should be cake, for cheap too.

 

i understand they are better & easier ways to achieve the goals i have set, the challenge is doing so with this particular cam.


some pics

 

flycut if nessary put a trex/ms4/texas giant and a ported fast 90/90 and some ported #243's or ported #317's milled get your compression at 11.1 1 7/8 lt's tsp sells some that are cheap and get the job done from what ive heard

ps i think you will need a 6 speed to hit 500 to the wheels and 500 to the crank that alot easier lol

 

If you are dead set on using that cam. I think you may need to step up to a set of aftermarket heads to hit 500 rwhp. Why not get a custom grind with some more lift to take advantage of a good flowing set of heads? I'm running a 228/232 on xer lobes with a 111 lsa and it rumbles quite nicely in my 6.0l setup.

 

if i can get 500 hp to the crank itll be happy, i just really want this cam because i get the guaranteed ruff choopy idle that i want. i cant say the same thing about any other cam, besides maybe a lunati cam.

 

whats the difference between milling and porting??

how much more performance would you get out of porting some 317 heads over some ls2 heads?

how much do machine shops usually charge to fly cut your pistons & to port/mill your heads???

 

check the vid in my sig and tell me what you think

 

can someone please let me know which one of these pistons from the first picture belongs to the lq4 engine and which one belongs to the lq9?!?!?!?!

http://www.performancetrucks.net/for...ght=lq9&page=2

 

Hi ,
you can get a choppy,killer idle with a cam that makes good power.The people on this site are quite knowlegable when giving advice.The ***** thumpa cam will give you a sick idle but that is about it.It will not be the best choice for your H.P goal of 500.The 500 is easily acheivable with a better designed camshaft and will still idle like a dragster.

 

WWOWW!!!!

greaattttttt sounding car thats exactly what im looking for

what cam did you use?

 

^^228/232 u dont need a huge cam to get that sound

 

Your choppy idle is gonna depend on your LSA I love the way 110's sound personally!

238/242 with .600's or so of lift with a set of as cast trickflows for dirt cheap with a compression rate of 11.2 -11.5 will definately get you over 500hp!

Goodluck!

 

How do you feel about the trick flows vs porter 317 vs stock l92's?

 

trickflows and afr's are pretty much the best LS heads. I think 317's are like 243 ZO6 heads but with lower compression. Milling is just getting the deck of the head shaved down to increase compression, porting is getting the heads totally gone over for better flow.

L92's are supposed to be real good alternatives to the aftermarket castings but it seems like they lose some low end torque. Vengenance says there as cast trickflows 220's make power like a cnc 215 for less money. Plus if you go stroker you can get them ported later.

 

if you decide to go that route how much $$ are you talking???

ive looked into some stroker kits and the cheapest ive found is around $2700 and somebody told me that if you stroke out these blocks you also have to resleeve them is that true?

 

I dont know if you do your own work but stroking can get exspensive. As far as resleeving, you dont have to do that when you stroke. you resleeve when you bore an aluminum block. I'm pretty sure iron blocks dont have sleeves at all so if you have an LQ4 you wouldn't have to worry about that.

You can get a rotating assembly from a sponser like Texas speed for about 1700 and take your engine out to a 408 from 364. From there 500 crank HP would be pretty simple considering alot of people are making 500 flywheel power with 346's.

To save some money you could do a head cam setup on your stock shortblock. some cnc'd 243 heads and a custom cam from Pat G or Pred Z should get you 500 flywheel hp pretty easy. Check the dyno section for some combos, if you have the money to spend you could make 500 at the wheels with a 408.

good luck with your build.

 

thanks GREAT info!!!

 

Vengeance has the 220cc Trickflows as-cast versions for 1699.00! They are awesome and flow I think just 5-10% less than the Full CNC'd versions. I think they are an awesome bang for the buck IMHO.