TRSCobra

Last Friday, I went to the drag strip for the first time. I took my '86 Z28. My BEST time was 15.335 @ 90.81 MPH with a reaction of .816 (ouch!)
Thats after a 3 hour drive (mostly idling in traffic) on an 85 degree day. My other time was like 15.369 @ 90.47 with a .488 r/t.

My car has a 350 with 67-70 327-350 heads, edelbrock 600 carb, rpm air-gap manifold with a 1" spacer, edelbrock street fuel pump, flowtech shorty headers and y-pipe, no cat, and 3" all the way back to a flowmaster and dual 3" outlets, accel distributor with 300+ wires and ac plugs. My trans is a 700r4 with a shift kit, rear is 2.73 open. I had street tires on, but not too much wheelspin.

I dumped all this cash into this thing and 15's is what I'm rewarded with? I know with tuning and a track closer to sea level, I could run 14's with a better R/T. I have a posi rear in my garage with 3.73's waiting to go in it. Will that make it much quicker? Any other suggestions?


P.S. I still beat my friend's automatic '03 Mustang GT with 3.73's and flowmaster exhaust (He bested a 15.5) so I'm not all that disappointed.

EvilCartman

iTrader: (1)

Reaction time doesn't have anything to do with the ET you ran. You can have a R/T of 5 seconds and you would have still ran a 15.335. What cam are you running? What's the track's altitude? What was your 60' times? Yeah the 3.73 posi will help out and lower the ET if you can get traction. btw, my old 305 ran a best of 15.21 @ 90 mph

TRSCobra

Stock cam, Elevation of 970 feet.

60' time of 2.256 on the first run, 2.200 on the 2nd. I was running like 18 degrees advance on these two runs, I later ran a 15.80 when we dropped it down to 5 degrees advance. That sucks.

unknown_host

iTrader: (1)

Gears and a posi would definitely help you, probably take you into the high 14's.

Your ET and MPH sound about right for a stock heads/stock camshaft 350. I know a few people with GM Goodwrench 350's who run high 14's/low 15's as well.

TRSCobra

What would my old LG4 run? 16's? 17's?

There was a sunfire there with a CAI and exhaust running 18.7's

unknown_host

iTrader: (1)

Probably mid 16's to mid 17's depending on what kind of shape it was in.

If you want to really wake your car up, you should buy a set of heads and a camshaft. A set of vortec heads would give you a nice bump in compression and a ton more flow. With a camshaft like the XE274 and vortec heads with 9.9:1, I bested 12.28 @ 111.85. I wouldn't be surprised if you went a full 2 seconds faster with a different set of heads, camshaft and gears.

Trevor86TA

My LG4 ran 16.0s stock with 3.23 gears and a 700r4.

18* initial advance? How much total timing? DO you know?

Gears, a little more stall, and then good tire will help. Your 60's are decent for the setup but with more torque multiplication you'll need more traction.

A set of vortec heads and an Comp XE cam would really make that up!

TRSCobra

With vortec heads, wouldn't I need a different intake? And with that cam and head combo, would a 600 cfm carb be enough? Should I go 750?

I have no idea about the total timing. With the timing light on and the dist. vacuum line plugged, at 2000 rpm it was like 18, but I don't have timing tape so it's a guess. I heard you can go up to like 32 degrees. True?

Trevor86TA

Yes, you would need a vortec intake. I am sure you could sell yours no problem though. It was just a thought. There are lots of cylinder heads that off increased performance - Vortecs are just the best bank for the buck.

A 600 would work but may be on the small size. I don't really have any experience with the Edelbrock carbs though.

You can run in the neighborhood of 36* total timing (ie. full advance). You won't want to go much beyond that and remember that more timing usually requires more octance to prevent detonation.

TRSCobra

Whatabout those edelbrock e-tec heads? they pricey? I had dart iron eagles in mind before.

Octane is no problem, I was running 93 all along cause i thought 18* was alot of advance

kylez28

because its a Turd gen..

Dirtbik3r

eww, that hurt.

Ray87Z

Some old tech crap heads that are most likely yielding a lousy compression ratio and a "stock" cam (stock from what, surely not your 305? I'm assuming an old stocker from the early 70s, probably total trash) are not a recipe for performance...

In fact it's a recipe for a 15 second 350... (I'm sure you could eek out a high 14 run with 3.73s and a posi/powertrax however)


I will second or third getting some Vortecs and a mild cam. You can run the Vortecs w/ zero mods to them with the CompCams XE262 cam (some attention will need to be paid to the vortecs if you run a larger cam than that) like I did with my 87Z's 350, along with the proper Performer RPM for Vortecs you will massively improve your car's performance...

five7kid

iTrader: (14)

Flowtech headers & y-pipe. 1-1/2" primaries, 2-1/2" out-pipe.

A sure-fire receipe for 15's.

todd200

No kidding. So far my best this year with the set-up in my sig is 14.3 @ 101mph. My Hooker Long Tubes go on next week with a 3" true dual exhaust and Moroso Spiral flow Mufflers. Should make a noticeable difference.

TRSCobra

Yeah, and I had to beat a flat spot on the one side to clear my oil pan and crossmember. I had an exhaust shop weld in 3" where the two pipes connect. Maybe next year I'll dump all that cash into this POS. For this summer, I'm sinkin the $$ into my SHO . Lookin foward to mid 14's!!

TBI92Camaro

YOu're surpised you are running 15's? Seriously Im not. the 70's were the years of crap motors and 350's making less power than a VTEC Honda. No matter what anyone says 882's suck *****.

Vortecs are a bang for the buck deal. My roommate has a set on his 383 and hes put down 373 HP/401TQ and its backed by a T56....still running street tires that dont hook too well and his 9 bolt has been taking a beating

Iron Eagles are badass heads. Proven performance indeed and well worth every cent. As for Edelbrock heads...they suck. Ive never been a fan of their heads and after seeing poor results and massive porting needed (Buddies 355 Cutlass), I refuse to ever own a set.