MaxxMitchell

iTrader: (4)

My current set up in my sig has been running for 2 weeks now. When I did the exhaust I ran stock 84 LG4 maniflolds, and Ypipe, and cut the Y pipe right before the cat, and thats all thats on the car for now. Well I didnt get the passenger side collecter bolted up tightly, and lost one of the nuts, and didnt sench up the other side of the flange. So basicly I had a HUGE exhaust leak right there. Well today I found the nut, and tightened her all up. Took the car out, sounds quiter, but sluggish down low, and runs completely out of breath at 5200. With the leak it would zing right up to 6000 no problem.

WOW I really want headers right now. These manifolds are the worst thing on my car. They touch the valvecovers, and are cooking the rubber gaskets there, causing an oil leak, I have 1" bolts in the air tubes, they are killing me on performance, and they look ugly

So far Ive ran a Gtech Pro a few times, and average 99-101MPH, at a 14.8-15.2. I feel pretty confident that my set up as is makes 290-320fwhp. Do you think I could gain 30-40fwhp by switching to Hedman LTs, and running a single 3"? The motor feels like it cant rev fast enough in first, I know the carb needs tweeking still, but I want to wait a month or so for headers. It doesnt bog, but smells rich, but the plugs read just right. I've installed headers on 3 of my friends LS1's and they gain ALOT of throttle response, and lose what little traction they had in first and some of second. All are 6 speeds.

Twilightoptics

Reading this post made me cry.

Seriously, have you ever looked at the collector of an LG4 manifold? You can barely get two fingers in there, let alone the exhaust for a 350 with heads and cam.

I'm running the 200cc pros with a MUCH bigger cam, and put down around 315RWHP at about 5900/6100rpm with a TH350. (maybe more now) with the T56. With a smaller cam (Can't find any info on it on summit, sure the PN is right?), and smaller heads I wouldn't expect anything past 5500.It might have "zinged" to 6000, but without a dyno you don't know if you're actually making power. I can zing mine up to 7k, but there is no point because I'm not building power anymore.

Headers (I personally love the hedmans on these cars. Cheap, fit best, easiest plug access), a 3" Y pipe into atleast a 3" I pipe, with a plain ol flowmaster would do you great.

Oh and ditch that edelbrock carb for anything else... a holley, a Q jet, whatever. Edel's don't make near the power the others do, just easier to work on.

MaxxMitchell

iTrader: (4)

lol now that I look at my sig, it didnt correct the number, im running a 1105 cam. Its a 224/234 .465/.485 114lsa. Headers are a major priority, and hopefully hedmans will be ordered in a few weeks. After headers ill hit the dyno, and see what it makes.

88 Z28 Guy

iTrader: (1)

Yea i would say headers are a must for you in my opinion. I would go with some headman lt's, thats just because i cant stand shorties.

MaxxMitchell

iTrader: (4)

Im with you, I just dont see the point in some cases. I really don't see a point when you can get Hedman LT's for half the price of a shorty header and Ypipe. I wish there was a good cheap Hedman Y out, and maybe there will be someday, but im not afraid of making something work.

Oh yea, I have looked at the colecter of a LG4 manifold, and yea its pretty small. I did those just becuase I bought a thirdgen camaro for parts, mostly for the TH350 in it, and the mounts for the TA and the crossmemeber and driveshaft. Well all of those where junk, so I had a custom DS made, modified my 700R4 crossmemeber, and put my 700R4 tailshaft on the TH350. I didnt have the money for exhaust yet, so I cut out the Ypipe, and sliped out the Y and the manifolds as one piece, and put them in my car before the motor. Ive had nothing but trouble with them sense day one. No exhaust leaks suprising, just other leaks becuase of them.

86t/a owner

is this just a n/a engine? that lsa is pretty large for a n/a engine, thats more of a nitrous, blower ect lsa, a cam down in the 106 108 area would work a bit better, but its fine as it sits to run her =]

MaxxMitchell

iTrader: (4)

It runs good, and about where I expected with stock manifolds. From my guesses I wanted to be some where around 300 at the flywheel, and its close from what its done. I would like to stick a 2500-3000 stall converter along with a XE274 cam, and probly will after a few months, or over the winter lol forgot about that offseason time.

After exhaust, and a little more fiddling with the car, and me learning what needs to change, I do plan on running a small shot on it 75-100. Its a stock 350 bottom end, so I dont know how much I want to push it, but im thinking 500fwhp could be pushing it a tad. Then again, HP numbers arnt what will break a motor, the condition, and settings will. Thus the disposable junk yard 350 for $63 after tax

Ive got another 010 block in the garage, with a forged 383 in the works, it just needs pistions, and machine work. Then Ill have to disassymble what I have now for the heads. I got tired of waiting for money, so I spent a little, and got the car running again. Not bad, as this is my first SBC that ive EVER owned. Not the only one ive worked on or built. Its a blast to drive, and I hate that my DD is a honda, but I cant beat the 30mpg when I drive 35miles to work everyday, a plus is that its a stick lol. Its fun to come home switch to a car that feels so different, and that I dont look like a giant in.

Twilightoptics

I always forget about the cost of a Y Pipe. I don't like the longtubes on our cars because of how narrow the tranny tunnel is, and because of trying to fit that other pipe over/under the axle on the drivers side... so you would in some cases need to bring it back to the passenger side... which is just funky and causes an unequal length. On my dual setup they are run on the passenger side, and are equal length.



114 LSA is just fine. All it will do is give a smoother idle, and a less peaky power curve (more broad)

urbanhunter44

iTrader: (3)

The difference between your car now, and your car with a good LT/ORY/3" setup will be near 40 hp. I can't believe you are running stock LG4 stuff. It's too small for the LG4 even.

MaxxMitchell

iTrader: (4)

I hate it as much as you, but I got the parts car for a $100 and it had a good tranny, and what I thought was a good 350, but it ended up being warn out, and would need machinework and a rebuild to bring it back. So I used what I had.

I cant wait for headers. I just dont have enough for the rest of the exhaust yet, oh well, Ill deal with it for a bit

The plan for my exhaust now is, Hedman LTs, 2.5" hedman S extentions, some 180*mandrel bends in 2.5 and 3", a flowmaster scavenger Ypipe 2.5" in 3" out. Then 3" in the stock location, and a bullet under the gastank with a dump pointing down and back, or some other muffler. It should be just fine for a 300-350rwhp street car, that might see a 100shot now and then. I plan on installing a couple 3 bolt flanges here and there in the exhaust for easy removal for track use, and ease of working on other things.

I dont really want to mess with running duals right now, but If I find a need for it ill do the simple, 3" S extentions, a X pipe, then two bullets.

urbanhunter44

iTrader: (3)

that setup will work great for your application, good luck!