Top speeds!

[1979C20]

Last night on the way home from sycamore creek, I opened 'er up on the empty highway. I hit a top speed of 111mph on flat ground and maxed out my engine at 5050rpms. Kept her thetr for a good 3 miles or so. No issues. No oil pressure drop. Stayed at 200°f. What are your guys top speeda and max rpms at that speed? This is a 79 c20 woth a 350, qjet, headers, glasspacks dumped umder the cab with 4.11 gears and 265/75/16's.

EDIT: SM465 tranny, too.

[Irish_Alley]

Lol 74 in my 79. But you have to use a GPS to get a good reading

[screamin86]

ive had mine to 120 with the 31s gps checked was at about 4400 in 3rd/drive th350 trans 3.42 gears.

[4x4orbust]

had mine at 70 on the speedo once.  (33" tires, so really about 75 or so)  for about 20 seconds.  that was a white knuckle ride!!     tach'ed about 2500.  th350 with 3.08 gears 

[Layne]

My buddy was driving my truckwhile I was following him, he had 115 with the 250, 3pd. Lol I think that's all it had too

[beastie_3]

You let someone else drive 115 in your truck? Must be a good friend!

[Layne]

Let's just say I let him borrow it.... He got an earful. lol

[1979C20]

I used a gps speedo on my phone. I pushed my pedal as far it would and the rpms topped out at 5050 and couldnt go any faster sadly. Its 4spd manual.

[thirsty]

Back when my 86 was on the road 85mph with 33's and a manual tranny, That motor wouldn't turn much over 4k rpms.

[ChYmAiL]

I have a 1980 250ci with a 1bbl holley carb... 3.08 final drive... 255-75-15 on the back, reached 81m/h. I still need 4 more to travel in time......

Measured with GPS

[jackjeckel757]

I'm gonna have to get a gps to figure mine out, the speedo bounces too much and with smaller tires its not correct. It says I've been over 100 but I estimate it to be more like 85-90.

[1979C20]

Do you have a cell phone? If so, how new is it? The new Android phones have all kinds of apps and I downloaded the free GPS Speeso app.

[Lt.Del]

<----- you see from my profile pic the fact that a '79 speedo is buried at 100mph.  I did that on I-95 coming from Washington D.C.  w/ the 383 and 3.08 rear on stock size tires.  I don't know how fast i got to, but I wasn't pushing it too much.  I still had more to go, but, I didn't want to lose my job AND I don't my tires to shred.  Most truck tires aren't exactly built for speed ratings-which scares me because my truck constantly wants to go fast on the interstate since it is a high gear rear and torquey engine.    I wish I had my gps on it. But then again, my gps sometimes reads I walk 268 mph (it's a hiking handheld gps that sometimes briefly loses signal)

[ChYmAiL]

my gps sometimes reads I walk 268 mph

Contact Willy Coyote.... you could help him get that roadrunner for once!

[78 Chevyrado]

I got mine upto about 100mph when I first got it road worthy, and it still had some left, probably not too much though.  Since then It doesnt go over about 80mph.  It'll do it, but I won't..  I think when you hit 90+ the gas guage drops as fast as the odometer turns.