#41  
Old 06-29-2022, 05:22 PM
Goatracer1 Goatracer1 is offline
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No where in the original post did I see where it could NOT be blown. You could do this very easily with a Procharger or turbo. My 431 makes just a hair under 600 hp with a very mild set of pulleys and if I am not beating on it I can very easily run 87 octane on the street. Runs a little rough when cold but idles at 700 rpm when warm using a Holley carb. EFI would cure the cold running problem for the wife.

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Old 06-29-2022, 05:34 PM
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why not 700 or 685 hp. somebody wants bragging rights or Paul is going to spring it on us he has already done it

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Old 06-29-2022, 05:57 PM
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Originally Posted by Dragncar View Post
Been waiting for this post. Its been proven with big cubes.
Yep, much easier, and certainly more streetable.

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  #44  
Old 06-29-2022, 06:08 PM
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Just to give an example, it's been done with BBC 454's. Friend of mine did that about 25 years ago with a 454, using a set of OEM 074 aluminum heads, and a solid flat tappet cam.
Tony Bischoff built that engine. It was 11:1 compression, don't remember the cam specs but it was fairly rowdy. Single carb and he ran it on pump gas. On Tony's dyno it made just a hair over 700hp. He dropped it in a 70 Chevelle Malibu and street drove it everywhere, said it would run on 87 octane if he desired. He did a couple of trips back and forth in it from Cincinnati to Pigeon Forge for the Rod Run. Neat car and the stock appearance on the outside never gave a clue.
He raced the car too, always with full exhaust and a DOT tire, but can't remember what it ran. I remember it was a stout piece for a street car during that time frame.

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Old 06-29-2022, 06:52 PM
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Quote:
Originally Posted by ta man View Post
Mine makes close to 600hp and drives smooth, you don't know the power is there until you step on it.
A larger cu inch engine could achieve the goal.
What would the Road Paver do in your combo?

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  #46  
Old 06-29-2022, 07:05 PM
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Sober thought here on any-all proposed combos: What would the max HP be if the rpm is limited to 5250 RPM?

My opinion is 400-500 ping-free HP NA regardless of engine being old or new.

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Old 06-29-2022, 07:56 PM
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Road Paver makes up to 640 Hp with 335 cfm heads, 500 ci and right carb/intake.

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Old 06-29-2022, 08:22 PM
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I made 650 on my pump gas 468 n it ran on 91 octane all day! Even did drag week with it, ran high 9’s at over 3600 lbs in not mine shaft air either thru full exhaust ,410 gears and got good mileage . I don’t see why someone couldn’t do 690 with more head flow, but what’s truly important here the 690 for bragging rights or ET??? Plenty of junkets out there claiming 650-700 hp and don’t show the numbers at the track rarely!!

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Old 06-29-2022, 09:03 PM
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Quote:
Originally Posted by grandville455 View Post
I made 650 on my pump gas 468 n it ran on 91 octane all day! Even did drag week with it, ran high 9’s at over 3600 lbs in not mine shaft air either thru full exhaust ,410 gears and got good mileage . I don’t see why someone couldn’t do 690 with more head flow, but what’s truly important here the 690 for bragging rights or ET??? Plenty of junkets out there claiming 650-700 hp and don’t show the numbers at the track rarely!!
I agree. There are a lot of variables to an ET slip. Some guys can't go to the track often enough or don't have the drive to dial in a combination. Nothing at all wrong with a dyno sheet. The only folks that seem to dislike them are the guys with the lower numbers.

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Old 06-29-2022, 11:13 PM
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Quote:
Originally Posted by jonmachota78 View Post
What would the Road Paver do in your combo?
Hard to say..you may see something like a Road Paver in my combo in a year or two with a bit more compression.

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Old 06-30-2022, 12:05 AM
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Quote:
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Hard to say..you may see something like a Road Paver in my combo in a year or two with a bit more compression.
Still pump gas?

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Old 06-30-2022, 12:47 AM
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Quote:
Originally Posted by PAUL K View Post
Kind of an odd post Steve25 (but wouldn't hurt to keep that mindset for future posts)

Fwiw the guy that inspired this post had a nine flat street driven Pontiac pump gas car that made around 900 HP.

I gave him a ride in my nine second pump gas Firebird the other day and he was amazed at how the car had zero tire spin on the street. That engine only makes about 850 horsepower and will run into the eights with nitrous.

I don't think 690 horsepower will be hard to handle but definetly won't work good with a stock suspension and BF Goodies.
Can you tell us about your 9 second pump gas combo ? Not spinning with 850, do you run a Grid with traction control and all the sensors ?
Doing it with Snowflakes (tires) would be pretty cool.

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Old 06-30-2022, 09:08 AM
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Quote:
Originally Posted by PAUL K View Post
I gave him a ride in my nine second pump gas Firebird the other day and he was amazed at how the car had zero tire spin on the street. That engine only makes about 850 horsepower and will run into the eights with nitrous.

I don't think 690 horsepower will be hard to handle but definetly won't work good with a stock suspension and BF Goodies.
That sounds like a sweet setup. It's not nearly as difficult to get these big HP combos to work well on the street as many here lead everyone to believe. You can't run a BFG tire of course but a simple M/T drag radial and some well thought out suspension tricks and adjustments will manage the power better than most people think without the need for any fancy electronics.

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Old 06-30-2022, 09:31 AM
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Still pump gas?
Always...its a street car..

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best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
  #55  
Old 06-30-2022, 10:11 AM
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Quote:
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Hard to say..you may see something like a Road Paver in my combo in a year or two with a bit more compression.
Same cubes???

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  #56  
Old 06-30-2022, 11:01 AM
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Quote:
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Can you tell us about your 9 second pump gas combo ? Not spinning with 850, do you run a Grid with traction control and all the sensors ?
Doing it with Snowflakes (tires) would be pretty cool.
Kaufman block around 520 CID. Offset pushrod Edelbrock heads, big solid roller and a ported Victor. It's basically a step up from a 523 CID engine I have on the East Coast that runs 5.0 in the 1/8 except that has standard pushrod location heads.

Not much electronics, an old MSD Knock sensor and an A/F gauge. I can use a nitrous delay for the first stage and a button for a second stage. This car has Weld Wheels but I've put on Honeycombs play around on the street. 😎

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Old 07-02-2022, 03:08 PM
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Hey Paul K what gears are you running in your car?
I went from 3:73 to 3:42 with the blower motor and now
I have my pump gas 462 in my firebird 625HP-634 lbs.
The car pull's hard it should be a 10:70-10:80 ET got to get
back to the track to know for sure. Just wondering if a 275 shot
on a big shot plate would get me into the high 8 second zone?
Just cirius on your thoughts about it. Thanks

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Old 07-07-2022, 01:02 PM
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This one - Semco Boys - 3 Dyno pulls of 720 hp 400 Pontiac Block 465 ci. Kauffman Highports Nothing to Exotic as said - Won the Engine Masters Challenge in 2015 - Power Density vs BBC Fords etc.
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Old 07-08-2022, 12:46 AM
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That engine is the model for the 461 I am finishing up right now. Same heads, slightly less ci, same CR, little bigger cam, worked 1050, shaft rockers, duel crank Teflon scrapper, trick pan, Moroso 3 vane, ported back cut rings. I expect close to the same results but a drag strip is going to have to prove it.
My heads do not have a ton of portwork, not sure about SEMA,s engine.

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Old 07-08-2022, 06:45 AM
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Quote:
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This one - Semco Boys - 3 Dyno pulls of 720 hp 400 Pontiac Block 465 ci. Kauffman Highports Nothing to Exotic as said - Won the Engine Masters Challenge in 2015 - Power Density vs BBC Fords etc.
More details please

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