I just got from the track and was expecting a 17 but the best time I could get was. I think it isn't that bad but the bad thing is that I am trading TBI for Holley Commander 950 Multiport fuel injection that has been sitting in my room for about three weeks.

60ft 2.34
1/8 10.29 68mph
1/4 16.07 85mph

 

That is a pretty good time for a full size truck. I would be extremely happy with that as my baseline.

 

Edit-just noticed you already had the commander. Your missing power is in the cam mainly. The stock piece is small. Get you an edelbrock TBI intake (not really neccessary but gives a nice gain up top), port out a set of 083 heads if you can get ahold of them, if not port your 193s a little, then get you a nice computer compatible cam. The main thing is it can't have much overlap to confuse the MAP or the O2. Keep the vacuum at idle relatively high 15+ in/hg @ 600 rpm or so and all will be good. This combo would be relatively easy to tune and really rock at the track.

I am running a similar time, with a 5,000 lbs G20, a 305, the above mods. Given that you have a 350, probably more gear, and less weight you see where you would be.

For the cam several come to mind, Crane 2030, Crane 2040, Mellings MTC1, Summit TPI hydraulic flat tappet cam, Comp Xtreme Energy 256 or 262, one of the smaller Comp Xtreme 4x4 cams, etc. Limit your duration to 220* @ .050 on the intake side. Use as much lift as you can get.

My 305 has 1.6:1 crane gold rockers on it (just put them on from the old 355 and had to retune the ECM for them, like more fuel).

 

I think it would be interesting to see how the holley does compred to a stock TBI system with no changes. Just get it tuned and take it to the track and see how it fares. Then go change the cam and gain like 50 hp.

 

That would be cool. I doubt it would make more than a couple of 10ths difference though at this power level, mainly due the the PFI's better response. Unless the stock TBI chip is way out of whack with his existing mods. He also has to get a good tune on the commander setup. He will have his work cutout for him.

 

The gears are the stock 2.73's open diff. I want to add the commander on the stock motor and tune it to see how much better I can do and then after that build a 383 because the engine has a lot of miles and uses 1 quart of oil in less than 1000 miles.

 

If its a stock TBI and ecm with no mods then I bet the MPFI commander could take a noticable ammount of time off. The stock tbi is a bit restrictive for a decent motor and the stock tune really sucks for performance. With a properly tuned ecm and 2" tbi I think it would probably be a wash...

 

WoooooW..... 1 quart in a 1,000 miles? Forget rear mail seal leak - do you even have a seal? I've never... NEVER heard of that kind of oil consumption. If you are going to need this motor to stick around for a little bit until that 383 comes together, I'd suggest finding and fixing that problem ASAP. I could see a quart low in 3000 miles, but you are talking nearly 3 times that! Hell, all of my valve stem seals are shot, and I'm only losing maybe 1/2 quart per oil change - which sadly is around every 4-5k miles.

That seems like a serious oil issue.

 

The engine is very clean it doesn't leak any oil it just burns it. It only smokes at wot but you have to pay attention to it to be able to see it.

 

I hate to admit it but my motor also burns about a quart every 1000 miles. It sucks. You never see smoke and the motor runs fine, but that oil just keeps disapearing. I have to pull the plugs every 3000 miles and clean them or replace them depending on how bad they are. I'm dealing with it right now since I've got bills to pay and a house to build. Come this winter something stupid is getting built or swaped in. TBI may or may not be in the future. Depends on what I can get a LSx for.

 

I just have to say it agian....

WOW! Maybe your oil control rings are shot, but your seals are so good so even if you thought you weren't burning oil, you were.... I just don't know. WOW!

 

I got a 72 chevy long bed, 355, performer intake, edelbrock 600 manual choke carb, flowtech full headers turbo mufflers dumped after the cab, 280 comp cam, double hump heads milled down, compression is a lil over 11 to 1, had a slippin tranny, and 3.08 gears, she pulled a 10.00 flat runnin rough

 

Oen quart a month is nothing...

Try three quarts a week. Had an old eclipse with 180,000 on the clock that did that. It left huge blue clouds everywhere it went. Ran like **** and wouldnt do over 60 but hey, it still ran.

 

Not to hijack this thread, but my old factory HO 305 burned a quart every tank (200 miles). When I was in high school, everyone used to think I did big smokey burnouts leaving school, LOL. I didn't tell them any different

Keep in mind that burning this much oil does cause large amounts of carbon build up, and will cause detonation if your not carful. I just tried running 89 instead of the usual 91-93 octane and it just wouldn't have anything to do with it. Knock sensor went nuts, and I'm pretty sure I got some detonation even though it was retarding timing. I lost about 5 psi of oil pressure across the board, so I'm pretty sure I just hammered the bearings a bit. I'm only caring 15 at idle and 55-60 at 5500 with a high volume pump and 20-50 oil. This thing is on it's last leg, I just need to hold out till the snow flies.

 

This thread really makes me wonder just what the hell some people do to their engines.... not you guys, but whomever owned the cars before you. We should have a compeition for who burns the most oil.

 

Have worked on many of these TBI engines in the past and oil consumption at these levels can usually be traced to a bad intake gasket. Oil gets sucked directly in to the intake port where the bottom of the intake port meets the intake manifold. Do a compression check - if you have good compression across the board (usually about 150psi or better) then it is probably a leaking gasket. We have seen some motors consume 1 quart every 300miles and when you tear them down, they are perfect inside with almost no wear. Another tell-tale is to look at the plugs - the plugs in the leaking ports will have a bunch of crud around the ceramic electrode - the others will be clean

 

My current motor is burning oil mainly because of the valve guides, and partially because of ring seal. It only has 60K on the rebuild, but the heads did not have new guides put in. Valve seals last about 3000 miles before the loose guides wear them out.

The old 305 was burning oil just from ring seal. The cylinder was so hour glass shaped that a .060 overbore wouldn't have saved it. A lot of these old engines have lead very rough lives with very little maitainence. Don't change your oil or your air filter and watch how fast things go down hill. You have to keep in mind that most camaro's were toys and treated as such.

In the case of my current motor, it's just seen too much track time. It's been to the strip at least 2 dozen times, and auto-xed a good bit as well. Not to mention I run the crap out of it daily. Machining practices have alot to do with the life of a motor as well. Torque plate honeing can add 50 to 70k to the life of a motor. GM started doing this with it's newer motors and they are lasting alot longer now because of it.

I can't wait to be not poor. Now that I'm actually making money, it all goes into not so fun things, like house payments, insurance and food. If your still living at home enjoy it the real world sucks. I have to put off my engine rebuild to get a subaru so I can get to work this winter , and no I can't even afford a cool suby like a wrx.

 

Well about two weeks ago I went to the track with the new multiport and only got two runs without any tunning just with a base map loaded. It was running very rich with 32* advance.The Best out of two was

60ft 2.09
1/8 9.85 mph 68
1/4 15.70 mph 82

 

Looks like you lost some power out top, but possibly gained some torque.

 

Cars get old and wear out, people skip oil changes, use cheap oil, etc. All takes its toll over time.

As far as engines go, as long as the insides still go around in circles and burn gas, Ill keep rockin' it out.

 

Alot of your time improvement can be traced to a better 60' time. Notice how you lost HP though. Your MPH is slower with the Holley system. You definately need lots of tuning.