Blazekillerace

I know this isn't a LS car, but figured you guys could give me a rough estimate. But, I'm curious as to what my 1979 C3 corvette might run at the track (1/4 mile)? I'm curious about the ET and the trap speed I should be expecting. I don't remember my specs on everything on my engine, ordered it from Skip White a long time ago. I have the paper work somewhere with all the specs, including the howard
Cam. So I apologize for not having all the information. I'm also around 1500-2000ft elevation. Mods are as follows:

SBC 383 Stroker 483hp/472ftq
-10.5:1 compression
-Aluminum Air Gap dual plane intake
-Aluminum Patriot Heads with better quality hardware
-Aluminum Full roller tip rockers (I forget the ratio)
-Hooker Headers
-Straight Pipe 2 1/2 inch exhaust
-750cfm quickfuel Q-series (soon to get)
-Built TH350 with 3400 Stall converter
-3.23 Gears
-All season tires 245/15's
-Weight reduction: A/C delete, (Aluminum engine parts, except the block), might do some other weight reduction things like leaf spring/seats/trail arms ect., but that's in the future. The cars weight is unknown to me. Maybe 3300lbs, I got mixed answers about my car

I'm expecting to get like a 2+ second 60ft, with the stock rear I will most likely baby it. I'd appreciate any input. I got told different times from people ranging from low 12's, to high 13's. Thanks guys!

HCI2000SS

iTrader: (2)

483 hp at the wheel or motor?

Blazekillerace

It is at the flywheel. I'm guessing maybe 430-440rwhp?

Also, sorry admins for posting this in the wrong section. Didn't see the stickypage right away.

HCI2000SS

iTrader: (2)

Even with a 2.0 60ft I'm thinking high 12's are still very doable

Blazekillerace

That sounds good. Because I don't see this car pulling a 1.6 60ft without big *** tires. I'm also very curious as to the trap speed I might get. Someone told me around 110mph? I feel a little doubtful of that, considering that's not far from stock fbody trap speed. But I guess I could be wrong. My dad took my fbody a while back to the strip. Ran a 14.15 at 101mph with a 2.4 60ft. I think my car should've done better lol. But considering the elevation an weather conditions, could've effected it. Just never thought a ls1 m6 would run that. But that's a different topic. Lol

98CayenneT/A

Just a guess but I think around a mid 12. Maybe 12.6 @ 112 mph
And for your 6 speed ls1, that 60ft is horrendous! Ha, even a not so great 2.1 60ft could of got ya around a 13.5 - 13.6 so don't feel bad, ha, just a terrible 60' your dad ran

Blazekillerace

Damn, was hoping for higher trap speeds lol. Appreciate your prediction though. Idk, just having a hard time with believing my ls1 with the same weight and 100 less rwhp will beat my corvette at the strip or from a roll with minor mods. Just wouldn't think a minor modded ls1 would keep up with something that makes nearly 130 flywheel hp more. But, In all honesty, I know my et would suck, I just wanted to see good trap speeds so I know I'm making the power at least. Lol and yeah tell me about it, it was when my car had some ugly *** 20inch rims on with a 245/45 tire, he said it was hoping all over the place.. Got 275/40r18's on C6 rims now though.

98CayenneT/A

You very well may trap higher and it would not surprise me, just a ruff guess from the description and saying your going to take it easy of the line. Only one way to find out tho

Blazekillerace

Very true. This may sound stupid, but I've read/heard, that a lower 60ft could result in a higer trap speed? I personally don't think it would. But I've seen some time slips like that, crappy 60ft, but higher trap than there best et/60ft time slip. Just a rare occurrence? Never made sense to me how that can happen sometimes. Lol But I agree, only one way to find out. My father thinks 110mph, near your estimate. I honestly don't know how it will launch with 245 tires. I'll obviously launch it the best I can when the time comes.

98CayenneT/A

That power + stall + street tires = 0 chance of hooking

Blazekillerace

Good point... Never had a powerful car like this before (powerful to me lol). The only thing similar I've raced with was a c7 at a track. Fun that was! Either way, this is going to be a big leap from a stock 2000 ss M6.. Has me worried a bit, sounds silly I know, considering most of you guys have quick as hell cars lol. I think it'll take time getting used too. Never driven a car with a high stall converter, don't know what to expect. Lol noob here.

ajrothm

If the engine makes a TRUE 483 crank HP, and the converter is somewhat correct, you should run high 11s at 112 or so in good air on good tires..... That's assuming EVERYTHING is correct... If not, it could easily be a 13 sec car..

255/60/15 ET Street radial will fit on the rear without rubbing the trailing arms.... It will dead hook on a decent track. C3s hook..

Blazekillerace

The engine dyno'd at 483hp/472tq with a Quick Fuel 750cfm at the performance shop I bought it from. I have the paper somewhere, I'll look for the sheet. As for the torque converter, I ordered it from transmission specialties, they recommended a 3200-3400 stall converter with my setup and 3.23 gears. But as for tires, I heard a lot of people running 255's, seems like a usuall setup for stock suspension/trailing arms etc. Some have said they can fit 275's in the back? Not sure if true. But how much shock will DR's put on a stock Iron 10bolt IRS Posi? That's my concern. Heard some horror stories.. And I never thought a C3 would hook up that great. I never seen one near my application. Most I see around my area are Pro-Stock. Or just heavily modded.

Pro Stock John

iTrader: (34)

Are you going to manually shift it?

I'll go high 12's with mph in the 110+ range.

But you might run high traps if you can figure out where it wants to be shifted.

Blazekillerace

Yes, I'll be practicing shifting it. I might or might not have this car ready before winter. But it's in the process of being put together finally. So what causes high traps? Better 60ft's? Or slower 60ft's? But isn't trap speed a good indicator for how much power a vehicle has?

ajrothm

C3 diffs are always a concern. Since its a 79', it has 3" half shafts from the factory.. Just install some good 1350 solid spicer u joints in them and it will be fine. If you start going under 1.6 60's, then I would be concerned. I ran 10.90s on a stock 71' C3 diff with 150k miles on it...3.08 gears at that.. Did have good half shafts tho..

A true 483 hp is good for 11.50s or better at 3600lbs in a GOOD setup with minimal parasitic losses... (Good exhaust, good hood clearance, no spinning accessories etc etc)..

Realistically, I'd see low 12s for you once you dial it in... Then start shaving it down from there.

Stick with the 255/60/15 ET street radials. They are 27" tall and clear the arms. A 275/60/15 is 28" and will rub the e brake bracket on the trailing arms.

You need the shorter 27" tire.

Btw there is no 3.23 gear for a c3 diff.. It's either a 3.08 or 3.36....(or 3.55/3.73/4.11)...there aren't even aftermarket gears available in 3.23.

You really need to make sure the tune up is good and everything is in excellent shape.. Get some drag radials and get to the track and see where you're at and work from there.... Don't be shocked to see 13 sec passes the first few times.

Blazekillerace

Yeah after reading the stories on the corvetteforum, I've Been worried ever sinse. I was thinking of getting aftermarket half shafts. The ones I were looking at however, were aluminum, but they were 3.5" in diameter. So idk if I should swap out my iron ones for aluminum. But I'll def buy some new spicer u-joints. My diff currently has 64k on it, but then again doesn't mean it's healthy. Never made noise or seemed to have slop in it, so I'm assuming it's fine.

It's good to hear my car should at least be capable of some decent numbers. Guess it's up to the driver to achieve them (me). As for the exhaust and hood stuff, I have straight dual pipes with Hooker headers, and had to buy a L88 aftermarket hood to have clearance for carb. I might have a few inches to spare, was planning on putting as much airfilter under there as I can fit.

I'm sure it'll take me time to get used too. I'm not used too these kind of numbers. I just kinda wanted to know what the car itself in all good conditions would pull.

Wheels, I planned on getting some different wheels. Might get 17's x ??. Not sure yet. As for now I might stick with these 15's and put on the 255/60's you recommended. And just go from there.

As for the gears, it's what the previous owner told me were in the car. But now after all this time, I feel like a idiot lol. My dad did spin the wheel and count the rotations. He told me it wasn't quite 3 and a half, but a little less. He said might be 3.36's, but I thought he was wrong because I was set on the belief they were 3.23's.. Well I appreciate correcting me, keeps me from sounding like a idiot. lol

But yeah, I won't be too shocked if I hit 13's. I'm a novice drag racer, so I know I'll have to get some practice at the tree. Appreciate all the advice, very helpful!

T6Rocket

Trap speed is the only true indicator of vehicle power. The only thing that will make it go up is more power, or keeping the pedal to the floor the whole run (if it wasn't before for some reason).

Al

Blazekillerace

I thought as much. I know gearing can effect trap as well. ET will take awhile for me to work on. But trap speeds I'm curious about as well. Not sure what I'll put to the ground, I'm hoping around 430rwhp (just a guess).

6D9

iTrader: (1)

That set up thru a stalled auto I bet makes between 310-340 rwhp.