as some of you know, the 6.0l had some bad juju or something the first time i put it together. killed nearly every bearing in the motor, had to have the crank ground, and the block align honed. i had ProLine Racing Engines in Woodstock put the shortblock back together as i didn't have the guts to try to do it again. too much money wrapped up in this stuff to tear it up quickly.

i hurt the 4l60e the day before i found out i hurt the motor. after being plagued with bad experiences trying to make an OD transmission work with the power we're looking at with too little money, i've decided to do something different. i picked up a th400 core to work with over the winter. in the mean time, my dad offered the powerglide out of his car so i can go race.

i also decided to ditch the injection. this decision has been met with mixed reviews...i know carbs better than most anything else. i understand how they function, and how to make them perform well. off the injection came, sold the stuff all over north america, and got an intake/carb/msd 6010 box.

here's a quick pic from tonight. i have driven it, though it was just up the street and back. no romping on it or anything, just simply checking function. i have about an hour of run time on the motor now, so i'm going to dump the oil tomorrow and start working on drivability tuning maybe by the weekend. gotta get an interface for the msd box for my computer still.

 

welcome to the dark side friend....

 

where did the trick recover jug go, that one looks .......well bad compared to the rest of the good lookin engine compartment. shulda used a turbo 350 with a long tailshaft cant say it wont take it lol

 

the recover jug cracked down the side

steve, where are your coils man?

 

Damn! A Proline motor. That should take any of the doubt out of the bottom end. Now your gonna be classified as a high roller. J/K the motor looks real good in there.

 

in a box, motor is no where near running yet.

 

Those intakes kinda remind me of the old Tarantula intake,
or even half a tunell ram. LOLol!!

 

Looking good, you made the right move.....thought we lost ya there for a while, whew.

 

carbs...

 

I thought carbs were unhealthy...wait you meant caburetors. Nevermind.

 

i got to play with the msd controller some tonight. the software is really easy to use. but without going to the track i have no idea where to start. it seems to really like timing though so far as i can tell at idle.

what you guys think? 232/240 .595/.609 114+4 with 11.5:1 compression. running on 93 octane. right now i'm running 34* of timing "locked out" after 500rpm. i got it set at 15* before then to help with hot starts.

 

mine is 12 under 500rpm
then 24 at idle with the map adding another 8. Right now total timing is at 30, some people run as much as 36-38 but I won't add that much until the dyno/track tells me it needs that much. Hopefully in 2-3 weeks I'll have enough time to sort through mine and get it all done.

 

yeah, i did get kinda distracted by the whole street car thing. i can still drive this thing, it's really not bad, even with an 8" 4500 stall converter. i can't wait to get the dead spot out of the tip in and see what it will really do.

 

I'll put my carb setup against any EFI setup at the track. Only difference is I will have even fuel/air distribution while most efi setups won't on all cylinders. Even the faster cars are running carb intakes with efi conversions on them. Been using them since I was little, no way I'm going to switch now for a strip orientated car. Lower air intake temps, better distribution, more flow, wilder cams compared to EFI, what's to miss again?

 

ah, ok. right now i'm not running a MAP. i can see the benefit of it though for idle quality. how do you have yours mounted on the intake?

 

50cc pump shot up front with a bigger squirter will get rid of the tip in stumble. These motors need a lot of pump shot to get up and going. Let me know if you have any other carb issues, I've pretty much dialed these things in over the past 2 seasons. Great fuel economy and crisp throttle response and great even WOT a/f ratio pulls.




take that 1/8" npt fitting off that vic jr and run a barb brass fitting off with with a hose ran to the MAP mounted on the firewall. Any GM map will work that is 1 bar, I'm using a stock ls1 sensor, but they're all the same. I had to drill/tap my super victor for the fitting since that intake doesn't have a provision like the vic jr did. Plus you can monitor vacuum while making pulls down the track to see if there's a restriction.

 

ok, i'll grab a 50cc conversion for it from work this weekend. i noticed that i went from a 31 to a 35 up front and it helped a bit. then i put a 37 up front and went from a 31 to a 35 out back and it improved a bit again.

what are you running for fuel pressure? i think i'm only running about 5.5ish right now. i got a piece of garbage mr. gasket fuel pressure gauge right now that bounces around really bad with anything over 4psi.

 

I'm running 7 on the carb, and 4.75 on a jet'd flow device on that solenoid thingie there

 

okie dokie. i'll set her to 7 along with the larger pump diaphragm

 

you can set it to whatever you want as long as you tune it for that float/fuel psi setting. What matters most is that it doesn't dip down low during a WOT pull in 2nd with that glide. My old holley blue couldn't keep up n/a with my old vortec combo and I'd start with 8.5psi and be down below 2psi at the top of 3rd. Now with this magnafuel setup I've never seen it drop more than .25 psi on the gauge in the cowl while spraying or n/a.

 

what about powervalve sizing? my engine will pull about 15" vacuum at idle. right now i think i'm runing an 8.5" power valve

 

see what the 50cc pump shot does for that transition area at tip-in. If it doesn't clean it up entirely and you have a lean spike on the wideband then you might have to play with that power valve. Drive around with a vacuum gauge duct taped to the windshield and see what normal part throttle cruise reads, then adjust for that tip-in and smooth acceleration if needed. I can tell immediately on the wideband, you might have more of an issue if you don't have one. I run a 4.5 power valve for this cam and a 6.5 for the last one, but you have a better idle vacuum reading than anything I run

 

i have a single plane efi setup. 12:1 a/f all the way across the board on the dyno. runs pretty well at the track, too.

all that stuff you just mentioned is false. i know of a '02 fbody with stock tb, intake, and injectors. had a nos nozzle fogger on it with a standalone fuel system.... that car ran mid 9's. and still fired up and ran like a stocker.

 

my thread is not about efi vs. carb...ya'll quit it

 

Looks good Matt. With shooting for single digits, I would say dropping the 4L60 was a good idea. I've got a couple doing it, only issues have been occassionally rolling the sprag; that said I'm still far from trusting in their reliability at that level. - Getting the glide to work well will be difficult w/o spending the $ on dialing the converter in to your combo.

I'll one up all of you with the MFI.....bring it!


- LOL

 

that brings a smile to my face for sure! can't wait to see what it'll do with that thing in the car!

i'm going to just try to go race with the 'glide. it's not the best for this combo. i'm putting a th400 together this winter though.

 

AWWW CRAP Shagwell---
I just drooled all over the screen!! LOLol!!


xpndbl--mw66nova--
Would a 750 dbl pmp on a bigblock be ok with the 50 squirter you're talking about? Or does the cam have more to do with that for the transition from primary to secondary?

Your motors are " All strip? " Ours will be mostly street.
The LS // LT bug hasn't got me yet, but the pics & performance you guys post may some day bite me!!

 

strange, i have a far wilder setup and have no need for a 50 cc accelerator pump. in neutral i have 5 inches of vac. @ 1400 rpm lol. just borrow shaggys setup there and no more hesitation
unless someone has over carbed , then its just a band-aid.
but at the track a blue bottle would cover that up no problem

 

My motor is max effort n/a setup for a small shot here and there. 8" converter, etc. The bigger squirter is for tip-in lean stumbles and has nothing to do with primary to secondary engagement. This is for the primary bowls not the secondaries if that's what you were asking. For whatever reason everyone I know with a ls based motor that has some work to it and a big single plane tries everything and then steps to a 50cc shot and it clears those issues. I know I changed pump cams and squirters until I was blue in the face and still had hesistation issues that showed up on the wideband as well as in the cars performance. Now fattening up the primary jet and idle mixture would "hide" those issues, but when everything is setup for a clean idle a/f and great cruise a/f ratio on the street the problem would show itself again.

Also shaggy....can i still try that thing out?

 

who's car is that?

 

Its probably slow...until you start it. Holy multi stages Batman.

 

well its not a max effort n/a motor thats for sure. there's at least a pair of foggers and a pair of plates on there.

 

i was talking about my ls based motor for the max effort n/a combo. The other requires a few bottles to max some decent power.

 

Nice weld on the valve cover bung on the left side of the picture.

 

i believe that thing also has a spray bar in the middle of the intake

 

Cool project, I have a 6.0 Ls motor waiting for some attention ($$$$).

I'm saving up for a Wilson FI manifold. Tunning & correction is so much more accurate and faster w/ FI, o2 sensor & laptop.

BTW, My 406 TPIS idles at 1100, doesn't beat up the trans when shifting from park to reverse to drive, and gets 4 passes to 4 gallons between fill ups.

To each his own, just have fun.

 

this is 100% subjective to who's behind the laptop my friend...

 

i see 2 stages up top, one stage under, and a spray bar. i wanna play.

nova! that thing is great. can't wait to hear some track numbers

 

thanks guys. 477ci, 1471 hi-helix, and a custom(designed by me) boost control system. We're shooting for mid 4's on a "soft" tune-up. This new combo should create a new personal best ET/MPH for me.

bingo. 2 foggers up top, one on the bottom, and an in-plenum bar set-up. That's some giggle gas for sure. I'm guessing it's not 3000#'s nor stock front suspension/firewall though. - I'd still run it; you either win or loose, it's still racing.

I have next to no first hand experience wih LS combos, but I have noted several fast carb combos running a 50cc pump on the primaries. I had assumed it was a transition thing just as Steve pointed out. - Now with the tunnel ram we run four 50cc pumps, 1:1 linkage, and 300+ of spray.

 

Nova, so far with some tuning at the track, i have my car at 12* to 500, then to 24 at 1500 and then 30* in by 3000. This is with the Trex cam, so the ride quality is not to o bad with the 6 speed, if it was an auto i would have the 30* in by 2000. My car doesnt make power till 4500ish.

 

Go with a bigger cam and abit more overlap for a carbed setup. 114+4 seems too wide to me for a carb setup.

Timing seems reasonable for 93 octane. Maybe take a few out while doing initial tuning to be safe. LS motors dont need alot of timing

Good luck with the setup, should run strong

 

i was mistaken, it's a 112+4, but still need to be tighter. this is the cam i had in it when i was injected. i'm going to go with something with a 110lsa and something in the upper 240's probably over this winter or next spring.

i'm running a tr6 plug with a .035" gap at the moment btw. 50cc pump shot conversion kit should be here tomorow. got a couple of side jobs i'll be finishing up then i get to play with my camaro...then calculus 2 homework :/

 

i can get you a really nice cam spec'd for that combo that works pretty well if you want It'll be about $450 when it is all said and done.

 

I dont understand why LS cams are so much more money than SBC cams. I understand they are abit larger on the journals so more material, but is it really 100 bucks more in most cases?

 

the cam sensor grooves are machined in the back for one reason.

 

Sounds like my Trex.

 

not quite...i'm going to get something with a bit better lobe shape than the trex.

 

hit me up when you want one, i got a good choice picked out for you Someone I "know" is running it as well. Latest lobes on the market that one guy has to order through comp since it's a proprietary lobe shape.

 

sweet. definitely dude. pm me with the specs if you don't mind?

 

can't really share the specs, was told not too by the designer.