hey guys i have an embarrassing question..i was test driving a truck yesterday and as i went to turn around there was a car coming so i hit it and wasnt paying attention and i think i hit around 4500rpm....the engine was fine and i drove it the rest of the way back no problems...so can a stock engine without valve springs and gsk do that without the valves floating??? mind you ive been driving my 3000gt vr-4 lately with its 7000rpm redline...

 

Are you sure it went to 4500rpm? the tacks on these things only go to 4000rpm, and you would be pretty hard pressed to get it up there in a stock truck.

 

welll know im not sure. it would survive 3500 then right?

 

stock valve springs will definitely deal with 3500. above that, you will float valves. I've seen numerous runs to 3600 on stock springs with no issues, though I know it's russian roulette to do so. With stock gov. springs, I would be surprised to see a 12v rev over 3300 under load.

 

x2

Check your tach, it only goes to 4000rpm

 

the truck has an exhaust brake on it. i did some research and you have to install 60# valve springs so maybe thats why the truck survived!

 

You only HAVE to do the 60lb springs on the exhaust side for an exhaust brake. I've seen several with just the exhaust side upgrade, just to cut costs, I imagine. Pull the #1 valve cover. If the intake and exhaust springs look physically different, then only the exhaust side is upgraded.

 

A stock truck will.

 

I dont see how a stock truck even got that high, If it was an auto aint no way, if it was a man u got ur licience of the cracker jack box

 

Highly doubtful it went above 3200 in BONE stock form. It is possible it has a GSK, but how possible?

The 60 pound exhaust springs are NOT a MUST. Pacbrake engineered in a extra hole in the butterfly, that when installed if the valve springs are NOT put on, that hole is left open. If the springs are put on, then that hole is supposed to have been blocked off. SO, it is NOT safe to assume it has the springs.

 

My "95 auto will only make 3100 at best unloaded. I guess if the nuts were tightened you might get more but you also get other problems.

Ronnie

 

My '95 2500 2WD has never seen 2500 rpm's. I'm running a TST plate, but I don't mind--I'm not a racer--I want longevity.