streetknight2

iTrader: (10)

I posted this on YB too, so if you responded there you don't have to again. I've asked tons of ?'s already lol, but this is my goal, so I want to know what would be the best engine for me to get.

I have a 3100lb Fox body mustang. I want a carb. that's my only stipulation. What's my best bet to be able to run mid 6's 1/8 mile in a 3100lb car.

LQ4, LQ9, LY6, LS1, etc.

I'm willing to use nitrous to reach the goal if need be. Was hoping to do one of these stock long block with a cam and spring change, but whatever I need to reach the goal.

Sorry for beating a dead horse. Thanks again.

menchaca

iTrader: (1)

i have stock shortblock 5.3 that was given to me with a 02 ls6 cam with 806 heads because 1 of the 5.3 heads had dropped a valve.so it is probably 9-1 or less compression.i put this motor in last thursday and took it racing saturday and ran a 6.7 at 104 mph off the trailer with no tuning.this was with a 150 shot and a 850 quick fuel carb which i know is too big but that is all i have.the car weighs 3000 with me in it.the car has a powerglide and 9'' rear with 3.70 gear.i know it will run 6.5 with tuning.

$O$OE

iTrader: (14)

6.0, L92, 4150 950cfm Carb, Custom cam, glide/3speed, and good suspension. I think it can do that N/A. (6.50)

xpndbl3

iTrader: (23)

3100 is too heavy for a mustang, start lightening it up !

Doug G

I think any one of them can do it if built with the right combo of parts.

But with just a cam/spring swap ???? maybe an LS3 or L92 if you can get the weight down... now if spraying all it comes down to is how many shots it will hold.

$O$OE

iTrader: (14)

With ARP hardware down in the shortblock, I think it can handle a 150 all day with good tuning.

streetknight2

iTrader: (10)

So, I would be better off going with a LY6 from the get go if I can find one?

bitterman

Its a hard call

Id go either

LQ9 and purchase l92 heads (Flywheel cut as needed)

Or go ly6 and do what you need to up the compression ratio. 9.67:1 wont be enough I'm sure. If you mill the heads and use a thinner head gasket you might get close to were you want but I expect will will have to fly wheel cut the pistons. Might be better off just putting new pistons in?

I went ly6 but my goals are not nearly as aggressive as yours.

B

speedtigger

iTrader: (16)

I can share my choice. I went Lq9 with PRC CNC ported Stage1 heads. The compression ratio is 10.9:1 with unmilled heads and the heads only cost $1150 fully assembled and flow 312 CFM. I thought that was a good inexpensive solution.

streetknight2

iTrader: (10)

Did you use PRC 6.0 or 5.3 heads? Just wondering as one of the cam experts on here recommended me to use the Stage 2.5 5.3 heads on the 6.0 to get the compression up.

Best deal I've found is $1200 on a LQ4 in my area and $1500 on a LY6. If I'm gonna have to pay that much, I wanna make the right choice.

Doug G

LY6 has the better heads (L92 heads) to start but I guess it comes down to mileage/use the motor come out of....Whats worse ??? a Taxi or a work truck ????

Your $$$ and call

speedtigger

iTrader: (16)

I used the 243/799 heads which are factory on LS6 & LS2 motors. They have a 64 CC Chamber. I don't see why you could not use the 5.3 heads to increase the compression with your dish piston LQ4.

toxic99

Could do t without the arp bolts, all day long with good tuning. But wouldn't hurt to throw better bolts in. An aggressive cam and big stall with gear would prolly get you in the 6.80-7.0 range at that weight. Throw some heads on there like speed suggested and possible 6.50s with really good tuning. If not, 150 shot would get you there no problem.

streetknight2

iTrader: (10)

Some of you are getting tired of me and multiple threads I know, but gonna post here too.

For the exact same money I can end up with a stock LY6 with a cam or a LS1 with PRC stage 2.5 5.3L heads and cam.

Would I still be better off going LY6 looking at it this way?

Thanks again.

xpndbl3

iTrader: (23)

yes

streetknight2

iTrader: (10)

I was on my way to pick up a LY6 for 1500 with 80k on it, but I just found a 01' LQ4 for 350, but mileage is unknown. Which way should I go? I know where a set of L92's are for 650

ZONES89RS

iTrader: (25)

To compare, my 89 RS, 2001 6.0, stock long block, with a 6 speed, runs 7.1 all day with the car at 3150 and me 300, 3450 down the track, now if you lighten up that stang, and I am taking a **** you are not as big as me, imagine my motor in your car, which is cam only, drop the weight to 2900 pounds, and automatic that will be faster than my manual, if you are say 150-200, that is 3050-3100 pounds down the track, I would imagine 6.7 or faster in that lighter chassis. Then there is the option for better heads that will male even more power across the board, net a couple more tenths and you would have 6.5 car or so.

We have a member that went 9s in the 1/4 with a stock 6.0, milled stock 799 heads, and a cam, but his stang was heavily gutted. Impressive none the less.

streetknight2

iTrader: (10)

I found a LQ4 pretty cheap, so I picked it up. Now just have to figure heads out. I found a set of L92's used....but I found some LS3's too and don't know which is better.

xpndbl3

iTrader: (23)

IIRC the LS3 heads would have the hollow valves or some variant of them....do more research on it.

streetknight2

iTrader: (10)

Well I bought the LS3 heads, should be here by the first of the week. Next on to getting cam picked out. And I made a big deal about choosing heads lol.