any quick 60 ft cars using a Power Valve in their Holley DP instead of the Plug and greater jet size?

Hey Tom, do I count?

I would say you do mostly because you'd kick my butt right now.. :D , but don't hold that timeslip too long ;)

Ummm, NOT! :D Didn't you pull something like a 1.57 60'? I've only managed a 1.60. (Do I smell grudge match at Nostalgia Drags?)

ooh ohh, that'd be too cool! If I make it down, it would be the first 1/4 my old car runs, but I'd almost not race just to ensure I saw you two square off!

Here is my best pass from Sunday

60 ft - 1.564
330 - 4.485
1/8 - 6.958
mph - 99.22
1000 - 9.105
1/4 - 10.927
mph 123.38

Jim, we will definetly have to line up on nostalgia day. Gene, you can man the video camera on the tri-pod. Also received those phenolic pieces yesterday..Thanks I owe you a lunch.

We managed mid 1.40`s with a powervalve in the front of a 1000 Demon.

Congrats on getting that 10 sec time slip! graemlins/thumbsup.gif

Real curious to see if the cold air ram helps Tom. I've never used wood, but the phenolic is a superior heat isolator. ( the big slab I sent you was for a large isolator plate if you choose) I've considered a cold air induction setup only for extended highway cruises, as underhood temps get high and you can actually feel the mill get soft. Figure it might be worth 1-2 mpg. But I've never known anyone to gain much in a 10 second blast.

Have you tried a tight lash setting yet?

Opps, sorry to take away from your post and orignal question.

My old Monza 60ft was 1.37 with a 750 vac with a power valve. Et was 10.24 at 131

My 66 406 went 1.57 60' barry grant 750 silver claw on a vic jr.manifold 3.5 powervalve in the front blocked in the rear.

Thanks, I guess my question was incomplete, I run a PV in front and a plug in the rear, how about PV both front and rear to help out on part throttle cruising.

Of course the concern is uncovering the rear PV opening on hard acceleration since those passages are higher in the fuel bowl than the jets..

Originally posted by mc71454:
Thanks, I guess my question was incomplete, I run a PV in front and a plug in the rear, how about PV both front and rear to help out on part throttle cruising.

Of course the concern is uncovering the rear PV opening on hard acceleration since those passages are higher in the fuel bowl than the jets.. hey tom i run a power valve in both on my 800 double
4.5 in front and 6.5 in back with my 60 bested at 1.54!
good luck

Gene,

I actually have a 1/2" 4-hole phenolic on there now (swap meet part). I have not tight lashed them yet, set them a .008" cold to allow for .006" to .008" increase when hot. My cam calls for .016" hot. I have used an airbox before and it helped with consistency and got me 1 mph at the top end running mid to high 12's at the time.

I've pulled a 1.6 with a half hearted launch tryin' not to blow the tires off, and I'm running a powervalve in an 1190 Demon.

Now that I know your question, I guess I don't count... only have PV's in the primaries. I can't even say "in the front". Mine are on the right-hand side! No circle track racing for me.

We'll see about nostagia day... I usually run 1/8 mile (tradition, long story) but for that video op I might just run 1/4 with ya. graemlins/thumbsup.gif

Tom,

I run an HP950 with both front/rear PVs installed. Jetted 77 square, .035 squirters, hollow squirter screws, stock pump cams in #2 position, and .130 viton N/S assembly. Best 60' to date is 1.52. Never once evidence of a fuel delivery problem.

Tom,
We just tried this experiment last weekend in a buddy's dragster during a non points event.
Basically, a LS 6 motor with a solid roller cam in a 225" RED w/PG and weighs 1900 lbs. Runs 5.1X in 1/8th
Removed and plugged the PV in the 1050 Dom and jetted up 8 sizes(to 91's). Promptly lost 5 mph. Plugs showed good. :confused:
Next run, returned to PV and original jetting...MPH returned.

I run a front P.V. and block the rear, it lays over on the big end with a secondary P.V. 1.45 60ft.

60ft is the same with or with out a secondary PV, I saw the difference at the traps.

I know I don't qualify as a fast car to most of the guys on this thread, but for what it's worth..... I run front and rear 5.5 power valves in a 750DP, jetted at 74/76. This car had a p/v block and 73/80 jets in it when I brought it home and the best time then was 13.3 @ 102mph. I can't really say for sure if the re-install of the p/v help or hurt. In those early days I was changing multiples of stuff between trips to the track. graemlins/clonk.gif

1bad67's post has me thinking that I should try the p/v block again now that I've got other things dialed in better. My car definitely lays down on the big end. My 1/8th mile time (8.19) has always seemed fast in comparison to the quarter (12.86). My mph (103.5) also seems low for a car in the high 12's. Since I've owned this car I've been able to gain .5 sec with minor tuning (advance curve, valve lash, jets, etc.), BUT with less than 1 mph improvement. Sumpthin's still not right.

som ting wong....

Thanks everyone...

I am going to give it a try using a valve in the back, free experiment...what the heck right ;)

Tom,

Did you ever try installing a PV in the rear, and if so what were the results? I've been running front and rear PVs in my HP950 since day one. Best 60' has been 1.48 and typical 60' times are in the 1.50-1.52 range. Last night I pulled the rear PV and installed a plug and also installed some jet extensions. I'm racing tomorrow so we'll see if it makes a difference, good or bad.

I realize this is an older thread but, just last Sat we ran a 1.39 60ft with a PV in the front.

Ken,

I never did the change. At that time I didn't touch anything as I went for the consistency thing.

But I will be very eager to here what happens to you. I will set mine up that way for the first time at the track this year (april 4).

Big Red, was that a change for you to run a PV instead of a plug.

BigRed,

On that pas were you running a rear PV plug and jet extensions?

I went 8.65 @ 157 with power valves front and rear.60ft times in the high 1.2's with a 1.240 being the best.#3700 Monte.

Well I would certainly like to hear a little more about that run Mike..

I have never blocked a power valve in anything. We went 8.46 162 with power valves in both ends of the 4781. I can see no reason for a motor to nose over at the top end with a sec. power valve and not do it without one unless the engine is lean with the power valve and jet setup.

Already posted and deleted it, helps to read all the posts hehe.

I ran a 3.5 rear valve idle vavuum is 5.5 no vacuum on the big end with a 950 HP

I here the rear P.V. channel can uncover on the top end. Maybe its not noticable on a 8 sec car as drivability isn't a factor. Just found that the best track performance and driving was blocking the rear pv. Dont have to change jetting for crisp idle and driving.

You guys that are having problems with the sec. power valves aren't building more vacuum than the power valve is rated at are you?

I have 2.5's in mine.

mc71454, we`ve tried both ways and it runs better with a pv in front as this is driven to and back from the track as yours is.

kjett, yes extensions and blocked pv.

BTW ran last night, 10.20`s 130-131 MPH all night long, even ran a 10.29 with a 1.50 60 ft, go figure :confused: ?!
No new best this winter for us I guess, the weather will turn hot very soon, oh well.

Tom - We haven't seen any correlation (good or bad) between performance and running power valves. Our best 60' (1.422) was with power valves front and back, but we were more concerned with clutch, suspension and tire pressure changes and can't attribute the performance to the PVs. And, trap speed (134-135) didn't change.

Well,

I made seven passes yesterday. 2 time shots and then rounds in eliminations. I don't think plugging my rear power valve and adding jet extensions made any difference. I had 2 1.49 60' and the rest 1.51. Car ran 10.71@125 in 1,400' air. This is the best time I've ran at this track, but I'm not sure the above mentioned changes had anything to do with it. I jetted up a little fatter and went from a 14x3 air cleaner to a 14x4. So not a very scientific comparison, but my impression is either way (PV or plug) will work fine. All in all one of my cheaper experiments smile.gif

Originally posted by kjett:
This is the best time I've ran at this track, but I'm not sure the above mentioned changes had anything to do with it. I think track conditions/prep were excellent yesterday.
Joe ran a 9.85 with 136.2 mph...best ever with his Nova. graemlins/thumbsup.gif

Originally posted by BillsCamino:
</font><blockquote>quote:</font><hr />Originally posted by kjett:
This is the best time I've ran at this track, but I'm not sure the above mentioned changes had anything to do with it. I think track conditions/prep were excellent yesterday.
Joe ran a 9.85 with 136.2 mph...best ever with his Nova. graemlins/thumbsup.gif </font>[/QUOTE]The weather at Commerce (my car, or both) was pretty weird yesterday. My car ran 10.75 first pass off the trailer. Air was ~1,600'. By the 4th round of eliminations my weather station (Altronics PerforAire Eclipse) was showing the DA at ~250'. Now, that's a "1,350'" inprovement in air. By the commonly accepted DA ratio (.01 per 200'" my car should have ran 10.68. Guess what? Ran 10.75. No change whatsoever in performance with such a big change in DA. The reason why is the pressure and relative humdity remained ROCK SOLID all day at 29.55 and 18% respectively. The only thing changing was air temp. In my experience pressure and humidity have a much bigger affect on ET, or at least in my car. Joe's pass was killer. I've got it on tape smile.gif At the time Joe made his best pass I also had mine for the day (10.71). We had a slight tail wind. I noticed Joe's car wasn't leaving in the air as much as usual. Perhaps more forward motion and less upward motion contributed to his improved ET?

Originally posted by kjett:
Joe's pass was killer. I've got it on tape...I noticed Joe's car wasn't leaving in the air as much as usual. Kenny,
Email me the video when you get a chance, please. graemlins/thumbsup.gif
You're right on the leave. We've adjusted the wheelie bars down...last run two weeks ago smacked the headers coming down. :(

My quick-16 friend bolted on a new Holley factory HP race dominator and it has them in front and back. He ran 7.35 @ 182 in or 1/4 mile quick-16 Sat night. 1.03 60' I don't think I'd be concerned in you door cars if the jetting is right for WOT...

my local track (http://www.morosomotorsportspark.com/dsweeklyres.html#ET)

good luck Paul S