JDCamaros

so i have a 87 305 700r4 everything is stock but a performer intake and holley carb. and took off ac and smog. i ran it down at the track tonight it ran a pathetic 17.1 my god damn 93 lesabre runs 15.6s all day and it has magnaflow cat, flowmaster dual outlet muffler, homemade cold air intake(pepboys special), stiffer springs for harder 1-2 shifts in valve body pretty much homemade shift kit done in school. maf disconnected and BF goodrich 235/60/15 drag radials but its still a little 3.8 v6. but i have another 700r4 that i put a trans go shift kit in with vette servos and putting 3.73 gears and b&m shifter in next month. so there might be salvation after all i hope.

EvilCartman

iTrader: (1)

What was the mph and 60 foot? 17's are stock 1/4 mile times for my year car with a carb and 305 lol

SSC

Are you using the stock distributor or did you replace that to when you did the swap? You dident mention it and its kinda important. I was very sad with my build at least wanted to get 14's at altitude dident until I figured the crappy edelbrock was closing the choke half the time I went WOT.

bluers91

You should put a full exhaust and your car to complement that intake and other mods. It would help you.

harner

iTrader: (2)

Is your carb tuned properly? What size is it?

JDCamaros

stock distributor, got car with the holley on it so no clue wat size cant read the numbers on it no clue how to tune carb but buddy is going to show me. i put the intake on. a headmen long tubes are in the mail doing side exhaust trans is going in tonight and gears some time in january. it was a tbi car they converted to carb.

five7kid

iTrader: (14)

"Stock distributor", as in factory computer controlled '87 carb distributor? If so, you aren't getting enough timing advance.

But, other than the Performer intake manifold, nothing else addresses the fundamental performance problems with the LG4 (assuming it is an LG4 - you didn't really say). The carb is worse than what came on the car stock (assuming it is an LG4), the exhaust is horrible on these (LG4) cars, the cam is lame in these (LG4) engines. Even the Performer intake won't help unless you do something about these other things.

Still, should have been a little better than 17.1. My car ran that stock at 5800' elevation (high 15's at sea level). If the distributor is still stock, and the timing is set at the stock 0 degrees, then you'll probably get into the mid-16's with more advance.

JDCamaros

well i went over the wiring on my car took out like 300ft of wires i dont need anymore cause it carbed. no joke. and i found that my fan was hooked right up to my power wire going to my distributor... no ****ing wonder my car was running like ****...

Drew

iTrader: (58)

That shouldn't really effect anything... What folks are getting at, is the stock HEI was controlled by the ECM. Since you've dumped the computer controlled carb, you need to run a standard vacuum advance HEI for a SBC, or your timing won't advance.

Beyond that, five7kid hit the nail on the head... If you haven't addressed the bottleneck that is the stock exhaust, or the peanut cam, you're just spinning your wheels. To get any real performance, you also need to increase the compression which means tearing into the engine, in which case you're further ahead to swap in something else.

five7kid

iTrader: (14)

An '87 305 has 9.3:1 CR. Not an issue.

JDCamaros

its a slow work in process. i now have a 350 from my 80z28 im going to rebuild but that takes time and alot of money. im going to do pretty much stock with a mild cam. but this 305 is running pretty strong for now. and long tubes with slp loudmouths going out the sides is going on this weeknd. so that should help a little. and yes i prob will change the distributor, plugs,wires. just need to figure out what kind. i only want to buy stuff i can swap over when the 350 is ready. but people who did my shift kit messed something up so it not even moving right now. mostly i was shocked about how my granny car walked all over my v8 camaro.

this is the way it sits right now but i have 16inch iroc wheels on it now..


the way it was when i got it

Black_Knight

If it was a factory carbed car then it would have come with the LG4 305 in 1987. I've got one of those with both a Edelbrock intake manifold and 650CFM carb. New plugs, wires, etc. The car is FAR from a rocket on the street. It might be better than 17 seconds in the quarter mile, but not by much. Mines got full cat back exhaust though, so that might help a bit. Regardless, the car is far from a rocket. Coming from a modded TPI 305 car, 2002 Firehawk, and 2005 GTO 6.0L car, the LG4 felt like a dog. Under whelming to say the least.

It will be awhile before I swap engines in that car. So I plan on throwing some headers on it, and possibly change out the cam since I happen to have the parts on hand to do that. If that doesn't do it, I've got a complete TPI system I can install on it.

Clemson327

iTrader: (4)

I think some folks missed this above.

Black_Knight

Yeah, I missed that too.

MD83Z

So I guess we are assuming it's a vacuum advance distributor, not computer control.

RBob

iTrader: (1)

An '87 would not have been a TBI car. They started in '88 for the f-body's. And if it was TBI then it is an L03, not an LG4 engine. But then the car would have to be an '88 or newer.

RBob.

Black_Knight

That's a good point.

John 89 Formula

my 89 with the lo3, before the 355 went in, would run 17's all day long (not that I'm proud of it) with stock trim and street tires on it.
I would say your times are not unusual.

JDCamaros

i know 87 did not have tbi... thats why this car is so weird and messed up. whoever had this car before me ****ed it up real good. if u look up my vin it comes back as a 87 irocz and its not....

JDCamaros

and when i took off the intake i found out its a roller motor... i dont think lg4 motors where roller motors??? either way im just toying with the 305 for now till i get my 350 ready to drop in..

Black_Knight

The 1987 LG4 was equipped with a hydraulic roller cam. That was the only year that was the case that I am aware of. Again in 1987, TBI wasn't an option, so if you were told the car was a TBI car that was converted to carb, they were either misinformed, or they meant TPI. It's easy to tell what you have or what the car originally came with based on the RPO codes or the VIN number.

John 89 Formula

'87 was the first year for roller blocks, I believe.
What is the eighth digit of your vin, an "H" would be an lg4 from the factory "F" or "8" would be tpi.
It's not unheard of to convert a tpi car to carb.

87 player bird

Big bottle of giggly juice should help you a bit.

JDCamaros

ok so. if it was originally a carb car would it still have computer with all the sensors and all that. cause my dash lights do not work at all. sorry to sound dumb im still learning.. cause my 91 305 tbi rs had the same sensors and hook ups all that as wat was laying round in the engine bay of my 87. like when i got it all the wires and sensors were just out and a mess 90% of them lead to no were. i took out like 300ft of extra wires. the intake was the same as on my 91 too. that is why i thought tbi. would the carb lg4 have the same type of set up or no???

racerquinny

iTrader: (1)

a few months a go i ran a 16.3 which i was suprised with my stock 305ci tbi..i still had my subs and all school work in the car.

LAUNCHING

Black_Knight

It would have an ECM. It wouldn't be the same, but it would have one. The ECM in the carbureted cars is probably just for check engine lights etc. My 1987 LG4 has one. Though mine has a TPI engine harness in the engine bay. Not sure why. I'm wondering if the factory ran out of carbureted engine harnesses and subbed TPI/TBI engine harnesses instead. The truth is I have no way of knowing. For all I know someone tried to swap to TPI and stopped mid-way.

Drew

iTrader: (58)

The resources I have at my disposal, contradict each other. 2/3rds show 150hp, the other show 170hp.

Back to the topic at hand... It sounds like the OP has no idea what he's really got. Before having any expectation of how it should perform, I'd want to know what engine is in the car (casting numbers), and I'd want to know if it's the original engine (id stamp in front of the passengers head, does the partial VIN number match the VIN on the dash?).

JDCamaros

1. not original motor has remanufactured tag on side of block
2. all vins do match up will post them when i go to the garage where car is held at.
3. to tell the truth idk wat all is going on with this car that is wat im trying to figure out. while playing with it and trying to make it a little better.
maybe like u the factory put in a different wiring harness in engine bay.
but i took all of it out so thats not a problem anymore
. this motor will never do anything fast, that why im building my 350 slowly.
there just little things im finding that were rigged that are not helping the motor any..

JDCamaros

feel like i have seen this car before??? you go to night class??? i go to ATC at night and are lunch is at 8pm when the night UTI kids are gettin at so i run into alot of them going to lunch.

racerquinny

iTrader: (1)

nope i am in morning.