kieth black hypertectic pistons and NOS ?

im running a 1970 460 stock block with atermarket studs replace the main bolts . truck rods w/ arp bolts . internal bal, kieth black hypertectic dished pistons about 10.5 CR, exaust ported D0Ve heads with CJ valves . right now about 500 hp . Whats your opinions of the Rpm limit , HP limit ? I have run a 100 hp shpt of NOS. and ran at 7000on rev limeter .IT LOVED IT!!! ... could i run a 200 shot ? 250? 7500RPM ?

You can run it anyway you like........

But honestly your asking for trouble with the Hyper stuff at those levels.

hypers like 0 shot Nos
they are not very forgiving with Nos


my opinion is they are JUNK

i have kb cast piston and have only a 100hp hit but im going to hit it with 150hp this year. my truck love it to but i dont want to go over broad. but i have a friend that spray 250 in a stock 351 all the time. i called kb they said a 200hp hit is no problem but it not there. im doing a 2 stage this year 50hp on launch and 150 down track.

Those are the N2O NFL pistons.

Hey, another guy from ABQ. Good to meet you.

I honestly would not run more than a 125hp shot with about 5 or 6 degrees backed out on hyper-pathetics. Be sure you're using a good nos jet tune that isn't to the old "fat" nos charts. They were known for lifting ring lands with the extra fuel built into the tune and that is especially dangerous with hypers. The new jet tunes have a bigger nos jet, usually by about 4 sizes and pull back more timing.

7k is kinda pushing it too I'd say unless you've got a lightened valvetrain. It is fun... then it pops. and you have to break out the wallet. Its your ride, but I'd respect its limits and have as much fun with what you got. If you're bit by the go fast bug and want more, build for more while enjoying the current setup. JMO.

Never tried them in a big block but i have beat the kb hyper domes to death in a 302 swinging it to 7k with a 150 shot right off the line running 10.80's for 2 years and had good luck.

1fatcat wrote:im running a 1970 460 stock block with atermarket studs replace the main bolts . truck rods w/ arp bolts . internal bal, kieth black hypertectic dished pistons about 10.5 CR, exaust ported D0Ve heads with CJ valves . right now about 500 hp . Whats your opinions of the Rpm limit , HP limit ? I have run a 100 hp shpt of NOS. and ran at 7000on rev limeter .IT LOVED IT!!! ... could i run a 200 shot ? 250? 7500RPM ?

ive got a purpose built nitrous engine and im very carefull with spraying it to 200-250 , shifting at 7200 ..meaning lots of good shit in my piece .......i would be very careful with those slugs ,rememeber tuning is very critical, what does the plugs look like after a pass ? what kind of fuel are you using ? etc, etc ......

btw someone had a great idea ----start another build while you got thise one running , you will always want more dope

1fatcat wrote:im running a 1970 460 stock block with atermarket studs replace the main bolts . truck rods w/ arp bolts . internal bal, kieth black hypertectic dished pistons about 10.5 CR, exaust ported D0Ve heads with CJ valves . right now about 500 hp . Whats your opinions of the Rpm limit , HP limit ? I have run a 100 hp shpt of NOS. and ran at 7000on rev limeter .IT LOVED IT!!! ... could i run a 200 shot ? 250? 7500RPM ?

what kind of times are you running on motor then on spray. i talked to Monty smith at drag week he said he doesnt recommend spraying cast piston. but it is done all the time and in his opinion a 65 nitrous is as big as he would use. this is the tune he gave me nitrous 65 jet fuel 52 jet fuel pressure 5 psi timing 26 degree with 100 octane 24 degree with 93 octane

1fatcat wrote:im running a 1970 460 stock block with atermarket studs replace the main bolts . truck rods w/ arp bolts . internal bal, kieth black hypertectic dished pistons about 10.5 CR, exaust ported D0Ve heads with CJ valves . right now about 500 hp . Whats your opinions of the Rpm limit , HP limit ? I have run a 100 hp shpt of NOS. and ran at 7000on rev limeter .IT LOVED IT!!! ... could i run a 200 shot ? 250? 7500RPM ?

Like Dfree says you can run it, but your tuneup better be spot on, there wont be much window for error.

I just love the title of this thread.......

Mark O'Neal wrote:I just love the title of this thread.......

Oxymoron?

Mark O'Neal wrote:I just love the title of this thread.......

EASY SIR !!!

thanks for the info every one it does help. I have a newer engine allways in mind and some spare pieses . so if it does gernade with more NOS , i will let everyone know the limet of that combination ! haha and build the new one better !! with the 100 shot i only took out 2 degrees , it ran best of 11.26 at 119 shifted at 6500 but was thru the traps on the rev limetr at 7000 @ 1200 ft ele. ..... So ifi step up anouther 50 shot should i take anouther 4 deg timming out ??? i know i may have to regear cuz its at the limmet now but already planning for that.. thanks ....

You need to take some gear out and look at your convertor.

Your spinning it a little to hard IMO for what its doing.

Guess what I'm trying to say is your spinning for nothing.

1fatcat wrote:thanks for the info every one it does help. I have a newer engine allways in mind and some spare pieses . so if it does gernade with more NOS , i will let everyone know the limet of that combination ! haha and build the new one better !! with the 100 shot i only took out 2 degrees , it ran best of 11.26 at 119 shifted at 6500 but was thru the traps on the rev limetr at 7000 @ 1200 ft ele. ..... So ifi step up anouther 50 shot should i take anouther 4 deg timming out ??? i know i may have to regear cuz its at the limmet now but already planning for that.. thanks ....

That is 11.26@119 uncorrected at Albuquerque NDW right? That's pretty good if so. I'm there often. Going tomorrow. Come by my pit if you like.

What nos jet setup and total timing you running?

right now im runnin a 4.56 gear w/ a 27" drag radial had a 1.69 60 ft . foot brakin it, flashin the converter at about 4000 or so . stock geared c6 trans i was thinkin a 430 gear or a 28" tire ????this current set up it was an old gearratio and converter recomendation from D&D racing years ago ???? so i guesse what im looking for is .... high tens on the 100 shot ? as its still a street /car show / friday night drag / Car ....building anouther race only 69 cougar for the future.

no it ran the 11.2 in Phoenix on the 100 shot I havent ran the NOS in Alb yet but has run 12.80s in Albq on motor

1fatcat wrote:right now im runnin a 4.56 gear w/ a 27" drag radial had a 1.69 60 ft . foot brakin it, flashin the converter at about 4000 or so . stock geared c6 trans i was thinkin a 430 gear or a 28" tire ????this current set up it was an old gearratio and converter recomendation from D&D racing years ago ???? so i guesse what im looking for is .... high tens on the 100 shot ? as its still a street /car show / friday night drag / Car ....building anouther race only 69 cougar for the future.

WAY to much gear...... Especialy spraying it..... I'd look into some 3.50-3.91 gears. Then see what the convertor is doing and maybe get it restalled.

ya i was thinking about a 3.90 ratio and a lower 1rst gear in the c6 trans ???

As a "rule" you should pull 2* of timing for every 50 HP of nitrous. If you pulled only 2* for your 100 HP shot, and the plugs and overall tune-up looked good, then I'd just pull another 2* out if you bump it another 50 HP. I ran Speed Pro hypers in my 466 build I did years ago, and I managed 200 HP of NOS with that combo. I never got to run it for ET, but it would push my 5600 lb supercab F150 through the 1/8 @ 108 MPH. Which "technically" would put it in the mid-high 6's. Of course to get it to lauch and keep traction, I had to launch it in 4wd. Needless to say, my front axle joints took a bit of a beatin'.

im running a 3.89 with 28 tall tires at 124 6700 rpm if that helps

1fatcat wrote:ya i was thinking about a 3.90 ratio and a lower 1rst gear in the c6 trans ???

Why do you think you need a "low gear set in C6"? Low gear set in a C6 is for Pullin trucks imo.

I provd that to be true with my Falcon. Tore

The low gear tranny kit works well in heavier cars a mile high here. That's the difference. At HRP I'd be blowing the 10.5's off but up here it works well to get the car off the line with out overgearing the diff causing your rpm's in the traps to be so high. We typically have a 7200 to 7500 DA. Talk about some thin air. Sometimes it goes up to 10,000'. Hell, that's when you can start using electronic devices again on a flight.