i have a 79' z-28 with a 350 bored .60 over speed pro domed pistons(10.3-1 comp.), ported 76 cc heads, torquer 2 intake manifold, matching cam(.488 lift 292 duration), 600 cfm carb, long-tube headers, True 2.5" duals with cross-over. The car has the m-21, 4-speed trany and 4.10 gears in the rear-end.
What kind of numbers will i put down in the 1/4? assuming i can drive well and get traction. How much hp is this combo worth?

thanks
Nick

 

Any guesses?

 

Well, I'll "guesstimate" for ya................I see no reason that, if driven right (and with good traction ) you can't pull off at least a low 13 or a high 12. Maybe faster? Maybe slower??

............but that's my best "guess"!?

My dad's '73 is running similar components (less overbore, a little more cam, dual plane intake, 750 Edelbrock, currently only 3.42's) and we're hoping for something in the 12's............not sure exactly what though?! In a couple weeks it should be road ready.

 

If your a good driver and you hook up high 12's. You need a bigger carb. But other than that good setup. Good Luck.

 

Definately a bigger carb

 

As a 79 Camaro owner with a bit better specs, I'm gonna guess 13.5@100 (assuming street tires).

Let us know who's closest!

 

14 something with lots of tire spin on street tires. No way is it gonna go 12s without better heads and bigger carb

 

Nah, it'll go faster than 14's. My '81 ran a 14.214 @ 97 mph BREAKING DOWN at the track. It was leaning out hard-core, so it wouldn't rev over ~4500 rpm, when it should have revved to ~6000 rpm +.

My 383 (in the '81) had flat-tops, 76cc chamber heads, .480/.480 hydraulic cam, stock Quadra-Jet (stock for an '80 Z28), headers, auto, 3.42 gears, and STREET TIRES. It cut a 2.0 60' time, but it all went to $h!t after that. If it was running right, it should have run mid-low 13's IMO. If Nick's got a 4-speed, 4.10's, and knows how to drive, he should be cutting a high 12 at least IMO.

The only way to resolve this is to take the car to the track!!!!

 

He may be able to hit mid 13s with GOOD traction but with street tires and 4.10s he"ll spin his way to a low 14(seen it before) High 12s? Better use some et streets. A 2.0 60' is not good enough IMO. But enough bench racing and take it to the track I hope you prove me wrong...its been done before

My 81 did the exact same thing on its 13.1 run. It leaned out so bad and coughed and popped its way down the track due to a basically stock fuel system. I wonder what it will run with my new blue pump and braided fuel line?

 

Enough with the speculation! Just go to the track and run the damn car

 

Early Camaro's are heavy. Good luck pulling better than a 13.5.

My '68 Camaro with 350 / 305 heads and a mild cam, TH-400 tranny, and no idea on rear gears (probably 3.20ish) ran a 10.2@72 mph at the 1/8 mi. track on street tires and no spinning. It was cutting out (damn cheap HEI internal parts) and wouldn't rev past 5000 RPM's, but was quite a bit slower than my stock 305 IROC.

 

I'll guess high 13's with proper tuning and traction. I had a '79 Camaro w/ a junkyard 400 (added cam, intake, headers), with dead stock heads and ran 13.8 @ 100. That was several years after I beat on it so it was probably a mid 13 second car when I first had it. I ran that time with a stock open rearend and 2.73 (?) highway gears. Good luck.

 

Whoa, nobody is giving your setup enough credit. The only thing holding you back IMO is your 600 cfm carb --- you need at least a 750 IMO. Otherwise:

• 350 bored .60 over --- that's a 360 c.i. engine
• speed pro domed pistons (10.3:1 comp) --- good compression ratio
• ported 76 cc heads --- smaller chambers would give you a higher CR, but the 76's will work OK
• torquer 2 intake manifold --- single plane, right? it'll like the high revs, but that's OK
• matching cam(.488 lift 292 duration) --- hydraulic or solid? even still, that's healthy enough lift
• 600 cfm carb --- should be 750 IMO
• long-tube headers, True 2.5" duals with cross-over --- what more do you need?!
• M-21 4-speed and 4.10 gears --- gold buddy, gold!

Now, all you need is TRACTION. A set of "trac-bars" and GOOD TIRES, and you're running a LOW 13 at least, and more likely a 12.something. Again, with lower compression, less lift on the cam, higher gears, and BREAKING DOWN, my '81 was already running a low 14. If I resolved my issues (carb), it would have been a mid-low 13 second car. Your's is a 12 second car IMO.

 

A buddy of mine ran 13.2 in his 80z. 350c.i. with 11:1 slugs ,ported 882s(76cc),.480 lift cam,1.6 rockers,air gap rpm,650 dp,3000 converter,4.10s ,long tube 1 3/4 headers,and ET Streets. All he could do is 13.2s at sea level. Tons of traction here. This guy knows how to tune his car and was very consistant. He since put on edelbrock performer rpm heads and a comp xe284 cam and now runs 12.6-12.4s

Good luck

 

Thanks for all the replies, I would just go to the track but the nearest one to me is about 120 miles away. With the 4.10 gears i'm not too fond of hwy driving. I might go some time this spring when all of the new damn snow melts. So do any of u guys think i would feeel the diff. if i got a 750 carb? Which one do you recomend?