Please no 383's or bigger! Want to see what you guys are running. I am running 13.9 @97 at 5800 feet and my tranny is stock inside with 206,000 miles on the clock. 2.5 inch catback too.

 

I have both 305 and 350 ETs in sig !

 

times are in the sig

 

305 ran 13.9@98

 

Best of 15.4 with the mods in the sig. I'm sure my cat is clogged, the carb was bogging out on me, and the engine has 172,000 miles on it. I'm sure that with a carb rebuild, engine rebuild (even to stock specs), and a new cat would yield a considerable gain. Until then...

 

2.1 60 ft
8.9 660ft
16 initial 38 total timing (5800 feet)
untouched vortecs 10.3:1 compression
my edelbrock has to be tuned almost 6% leaner for elevation. my converter is like stone stock 1800-2100 stall. I should run low 13's at sea level but don't you guys think that I should be into the 12's? Maybe it's the 2.5 inch catback....need info, thanks.

 

Two things I would change.....Bigger stall and some better gears. 3200-3500 stall and maybe some 3.73 gears.

 

It's in the sig. Thats with a 2.4 60'. I feel so slow now.

 

Too lazy to change converter now, I think that I'll wait until the tranny goes then I'll get one from probuilt 3000 stall sounds nice. As for the gears I prolly won't change them since gas milage means something plus I already went through that whole thing with the speedo gears. Need new cat-back that's at least 3 inch.

 

You have a 12 sec car already ! The NHRA correction factor
chart only went to 5500ft and that corrected your time to
13.01 at 104 mph. So at 5800 ft correction you should be in the
12's.....

 

225k mile 1984 LG4 with a small .420" lift cam, Hedman headers and Dynomax cat-back. T5 with 3.42 open rear
14.494 and 98.7 on a 2.31 sec 60-ft time


Pete

 

13.03 @ 102.40 with a 1.88, non corrected, 4800 (really 5000 ft above sea level). My cam sucks below 3k but I still manage a good 60 with my "varable stall" 5 speed.

 

Thanks for the vote of confidence 84305HO, I feel like going to sea level to see if I can run those times. That is if I don't get detonation with my iron heads and over 10 to 1 comp, might have to back off the timing.

 

8.11 @ 85+ MPH in 1/8 mile. 305 w/750 vac. sec. Holley.

 

What do you have done to that 305? Thats pretty quick.

I never got a good time out of my car. My best was a 9.410 in the 1/8. I was having a high end problem though which turned out to be a problem w/ my cam which eventually granaded. That was with a t56 and 3.45 rear gears. I had 305(416) heads, alum intake, and the stock computer quadrajet. I switched over to the demon 750 dp, and performer rpm w/ open element. This made my problem really pronounced in the high end. Instead of just feeling a little funny I could actually hear it pop(I think because of the open element. It turned out to be because of one of the cam lobes wearing away, and not opening an exhaust valve properly. Even w/ the problem I got a pretty good seat of the pants feeling by getting rid of the quadrajet and the stock LG4 timing curve. I also got spohn LCA's, lower control arm relocation brackets, and poly torque arm mount that I never made it to the track with.

I now have a set of sportsman II heads and will have a much bigger isky solid cam. I will start buying the stuff to rebuild the motor in a month or 2 after I pay for the rest of the body parts I am replacing and having it painted It should be a hell of a motor when I get done and hopefully this time I will make sure that everything is set up right so I dont tear up another cam.

Ben

 

The 8.11 was with a pretty wild Summit cam 234 dur/.488 lift. We are changing to a Crane 230 dur./.465 lift to improve launch power. Using 1.6 roller rockers. We are stuck w/1.84 60' times. Am also changing to an air gap dual plane. Have the lightest secondary spring in carb. Heads are 601's milled to increase compression and mildly ported. Using accel distributor and box.

Removed 700r4 and replaced w/th-350 w/3200/3500 stall converter. 4.10 gears in 7.5 w/torson diff. welded axle tubes and support cover. Boxed control arms, adj. panhard rod and air bags in rear. 90/10 lakewood struts up front. 28 X 10.5 X 15 ET slicks.

305 is pretty must just for practice. Will be replacing w/383 eventually. Car runs well, we are aiming for 7's w/305 then add nitrous.

 

Does that thing have enough gearing to run the quarter? If so it should be running mid 12's. Thats pretty impressive for a 305 in my opinion. I guess I have seen mustangs do it farly often w/ 302s, but they have a bit of a weight advantage, as well as a bore to stroke.

What intake did you have on it now? I guess people are usually afraid to go that big on the cam, so that could be the difference, as well as the aftermarket ignition, and traction mods. Have you considered using a dp on there? That might help out your 60 fts. I know that my dp made a huge difference over the quadrajet even w/ the problems I had w/ the cam. I know that the quad may not have been as good a carb as a holley vs, but I had it set up pretty decent. I know that people usually say you get a quicker response w/ the dp, and w/ that stall I would think you could take advantage of it pretty well. If there is a reason you went w/ the vs, I would like to hear that as well.

Ben

 

Is optimized for 1/4 mile. If it was only 1/8th would use 4.56 and shorter tire.

Present manifold is Torker 2 SP. Replacing with air gap DP before next race. Also changed Summit cam to Crane. Little less lift/duration along with different opening/closing points. 106 LCA instead of 114 w/Summit cam. Hopefully will allow harder launch. Actual stall on converter is around 3200 at launch. We are trying to get 60' down, took 1" open spacer off torker and picked up .05 off 60' and .15 off 1/8th mile.

Used 750 VS because vac. secondary carb would self compensate for engine demand. Could not completely determine what size so took safe route. Have changed pump cam, nozzle size and spring. At present we are running lighest spring from kit. No bog or transition to secondary evident.

Heads are weak point of engine. #601 heads off 305 with 1.94/1.50 undercut valves. Milled and mildly ported heads. Comp. ratio is aroung 10.5 to 1 to 10.75 to 1.

Hoping changes will allow harder launch and that new cam will help make heads work better from 3,000 to 6,000 RPM. Power tends to drop off above 6,000 even with the bigger cam. Probably due to weak head flow. The numbers for dur./lift are not much different for the two cams, but the opening/closing points, overlap and LCA are much different. Exh. opens later allowing longer power stroke. Intake closes sooner which helps dynamic compression.

Would expect 1/4 mile in mid 12's. Car is in 3rd gear for last 100 feet of 1/8th mile. This is the weakest point in high gear, especially with old cam.

Car is not a dog, runs pretty good overall, much better than expected. We need to improve lack of torque down low to go faster. Car hooks well, we take video to see what happens during launch.

Will find out results of cam/manifold change Jan. 2nd test and tune.

 

No times with the 350 yet and only went to the track once with the 305. Best time out of four runs was 15.21 @ 90 mph 2.19 60'. That was with a XE256 cam, torker II intake, same speed demon 750 I'm running now and the same exhaust system. Probably could have gotten a 14.9X if I went back after a jet change. Shooting for low 13's first time out with the 350, just need to find some traction

 

i got my new best time friday i was running rpm intake 650 dp pro billet dis hei, dart iron egale heads 215 cc intake runner 64 cc combustion chambers 205 160 valves comp cam extrem 274 230 236 @.50 and 488 490 lift 1.6 full roller rockers hooker long tubes true duel 3 inch exhaust moser 9 inch 4.10 gears tko t-5 5 speed,car ran 8.2 at 90 in the 1/8,the new mods i just got was the victor jr, 750 dp, comp cams extrem 294 250 256@.50 and 519 525. and nitto drags,just run it friday night,new best et 7.6 at 94 mph and its a 355 ci

 

Old 86 firebird- 305, 230k on the clock, crane compucam 2032, 670street aveneger holley, edlebrock headers, slp cat back, performer intake, ran a 13.81@102.9mph

car wieghed in about 3450 with driver.


New car and motor are in the sig, car weighs 3550 with me in it and minimal gas...

I expect to see a 12.6 out of it come spring, just need to learn what rpms to shift at best, and better my launch... should be running at least 1.75's off all the suspension stuff i have...

Steve

 

edelbrock 1405 , 600 cfm, choke removed. 101 primaries with my own "custom" rods, 73x -as thin as i could make the tips yet still have a tip- secondaries are 95s or 98s i cant remember

I have some major launch problems including wheelhop and bog because of lack of pumpshot volume. Once i get the wheelhop sorted out i hope to hit atleast 13.2s. I might toss in some 4.10s and go for 12s eventually.

This is a 305, Torker 2, 214/224 ssi cam with 1.6 rr's. 416 heads fully ported by me with stock size valves (backcut). 10:1 cr, 3.42 gears, 5 speed.

times are in the sig.

 

At 5800' you have to make the best use of all the air you can grab onto. You're not.
Let the sucker breath...
Cut the drinking straw exhaust off and built a nice 2.5" into 3.5" system with a Flowmaster 2 into 1 merge collector. ( flowmaster catalog)
Get a 750cfm carb and build a under hood cold air box to seal to the Cowl induction hood.

Since by your own admission the trans is ancient, replace it with a rebuilt TH350 and a 10" 3500stall converter. you can replace the trans and get the high stall converter for less that a standard th700r4 rebuilt.
Your cam is big enough that you're not likely saving any fuel by using over drive any ways.
(with 3.42's while in over drive your Cruising rpm is too low)
your actual fuel mileage will not be bad.
get some high traction tires like Drag Radials.
12 second potential ( easy low 13's ) with good mileage even at 5800'.
Take the cork out give it some bite, and unleash the hounds!!

My 350vortec combo was very simular to yours went from 13.40's to 13.0 just by changeing the trans and converter. gains a ton of reliability too. 2.10 sec 60ft to 1.78 sec.
Mileage was still very good.

38degs is likely too much, Vortecs don't like or need that much advance. 32-36 is best. might want to recurve your distributor to get 36 total while retaining the 16 deg at idle. Once you cure the breathing problems experiment with the total timing to see what give the best 1/4 mile MPH on the time slips. Tyry it.

 

THanks for the advice F-Bird. I will be getting a new exhaust soon probably a hooke 3 inch. as for the carb I want to get a Holley 670 cause I used to have a 750 on it and it ran real sluggish and just used alot of gas. I know that Vortecs like less timing but at my elevation the car runs better when I go from 34 to 38. Maybe at sea level 34 is better. Also I will be getting a new converter soon too. I had wanted one for a 700 but you have a point with the price issue.

 

Pablo,

Thanks for showing everybody that you are running 13 w/ a 600cfm carb. At least you did the math to see that it is more than enough. 750's on 305's. Yeah, maybe if you are pushing 1200rpm. Maybe I'll put my Demon on the 305, I should be running 9's for sure.

 

my 670 made just as much power on the dyno as the dyno shops 800 carb.... that was on my 350...

 

yep it works fine especially with the single plane. I dont know if it would be enough with a dual plane

 

well i do know it was too much for a 305 on a dual plane... had lots of trouble gettin the bog out of it...

 

if it was "too much" then you were probably going the wrong way with your tuning. Should have been fine. You wanna talk about tuning problems, I know all about em. Takes work, but it can be done.

 

Carbed 355 times in sig.

 

Uh... What sig?

 

Here's a video. Not the fastest but decent.
http://www.imagestation.com/picture/...4/f9eb5842.mpg
Hope it works.

 

I ran a 15.5 @ 88 in my 1984 G20 chevy van it is setup the same way as the 1983 camaro. The trans is 700r4, 3.42:1 posi, 235-75-R15 tires, weighs about 4,700 lbs. Engine same as my sig. Stock 795 non cc q-jet 72 jets, 50 m primary rods, 7 in/hg spring, f hanger, Dr rods. 10* initial advance, 22* centrifical starts @ 1,200 ends @ 3,000, 10*@10 vacuum advance. I haven't run the camaro yet but am fully expecting 14's even with the taller gears, tighter converter and non posi rear.

 

I always enjoy seeing a modded chevy van!! BTW I like how you posted your timing specs!!

 

New best of 8.07 in 1/8th mile w/1.77 60'.

305, 750 VS Holley.

 

Stock 305, completely stock at the moment... time in sig (already altitude corrected.)

 

11.96 @ 113.5

355 vortecs, xe274 cam..

 

all hail pony killer

:hail: :hail: :hail: :hail:

 

355,victor junior heads, 630 lift roller cam, 4000 stall, 4:56,800 edelbrock carb,crappy traction, 11.6s

 

on my extreme energy 274 cammed vortec 350 motor, I ran a best of 12.1@110 (thats corrected for 3,000 elevation tucson) but the new motor should be good for 11's uncorrected here in tucson. Will have times this weekend hopefully.

 

84 G20 van... A friend of mine had one of those in Florida here that ran a 14.6 on the motor, 355 ci ,TH350 tranny. It ran 12.8 on the bottle.

 

Times in Sig.

 

I ran a corrected 12.7-12.8 in 5500 feet Abluquerque, NM on Febuary 1st. That was with my cutout open and a no traction 2.0 60 foot. Hoping to be quicker with the Holley 650 DP and 5 speed.