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900 HP on pump GAS ,NA

36K views 59 replies 31 participants last post by  BillyGman 
#1 ·
I have sold the engine out of my chevelle , the reason why is It did not reach my ET goal of High 9s on engine . So Time for a new engine . I have not nailed down what ci engine I want to build or what Kind for that matter . My Question is Is it possible to build a pump gas engine that can make 900 hp naturally aspirated ? I have a link to one such but just don't know . In my dreams I would like to run a mid 9 on engine on pump gas . can it be done .

here is one Im looking at .
http://www.ultrastreet.net/engines/632_bigdawg.asp
 
#2 · (Edited)
#4 ·
Jim came pretty darn close with "Bruiser", a 555ci with pretty much all off the shelf stuff. I would think that with something a little bigger like a 583ci short deck motor, the same planning and thought going into the build, 900hp should be achievable. Then, there is always the option of going tall deck, in which case 1000hp is more than possible with less planning and less effort. Its really not as hard as it sounds when you have enough ci and a good solid top end breathing for you....just my $.02
 
#7 ·
from the Shafiroff ad:

* 900 @ 6200 RPM
* 845 @ 4600 RPM
* 4.600 x 4.750
* 10.75 to 1
* 93 Octane

It's just hard for me to imagine 9s with that low RPM.

Needs the $250 HIPPO roller lifter option.
 
#8 ·
Problem with the Shafiroff is they dont seam to run the #s, and may be over rated
HP wise.

Someone on this board recently biult (or is building) a mid 500 cube deal with a set of Curtis Boggs heads, it sounded like a killer deal that should make around 900 on pump gas I believe. Who was it?
 
#11 · (Edited)
we built a 572 bbc 2 years ago with the intent of centrifugally supercharging it a year later, so the compression was 9:1. motor made 730 on pump gas and ran 10.10 in a 3300# 68 camaro street car. owner changed his mind about the blower, so we raised the compression to 12.5 and added nitrous. motor made 880 natural and 1206 on the bottle. still drives the car to cruise night and runs 9.10 natural, 8.5 nitrous (now race gas). i would build this motor bigger(632), lower the compression for 93 octane; this combo would make 900 and easily push your car into the nines. i'm guessing your chevelle weighs 3700-3800# and obviosly hooks hard. this conventional headed bbc would be the easiest pump gas naturally aspirated combo to run the number and fit the car with the least trauma.
 
#12 ·
I don't know if it would hit 900 but it will be strong. There were some glitches after the break in run on the dyno so we don't have the final numbers yet. We are waiting for the vendors to get parts back. Mike is so meticulous it wont run unless it's right....
 
#15 ·
To me Pat at Nyes under rates his motors by a long shot. Had a friend just dyno his '57 Chevy pickup with one of Pat's 383's in it make 398hp at the tires through a TH400 and a 9". Pat only rates that motor at 450hp at the crank. Pat builds a nice motor, thats for sure judging by what I saw in my friends truck. He also offers bunches of options and will work with you to build something in the same general price range as one of his "crate" motors. Even though Ive seen Pat's work in person and seen what kind of power it makes, I still would probably talk to Mike before I settled on one of Pats motors.
 
#18 ·
As I'm sure you remember, I built a 582 last winter. I went with that as it was about as big as you can go in a 9.8 deck block (actually can go 588 at 4.625 x 4.375).

I avoided the 598 as they really need to be done in a 10.2 block which adds even more weight which was a concern.

565 and 582's are good combinations...just gotta get the right setup to make good power using pump gas. I'd say it's gonna take a ptetty good effort to make 900 hp...850 shouldn't be too difficult, but 900...

My suggestion is to talk to Tracy at Sunset as he's built a ton of the conventional headed 565 & 582's and would know what one can make on pump gas and how much effort it would take.
 
#19 ·
I think that the way your car works a 540 or 555 done right will get you where you want to go. My 555 is seriously compromised by my car weighing 4000 lbs. Stand by and it should go back on the dyno again soon. Head porting and cam selection are for moving the land yacht.
 
#22 ·
I'm thinking that you are going way too far in the other direction. I think 900 is going to be too hard to hook, and it will start breaking a LOT of stuff. Mine is under 900 hp at 3200 lbs and goes 9 teens at 146. I think if you can make 800 you should be good for where you want to be.
 
#31 ·
As John said....The 555" we did could have been real close with a light ring package and a pump. It really was a bolt together deal without a lot of tricks. Moving to the 355cc Darts, maybe a 4.600 bore and some cam could for sure do it and also move RPM range up a little higher to make it easier to hook.

I helped a buddy do a 632" a few years ago. He pretty much picked all the parts originally and I fixed it and put it back together after his original builder missed a few big items that allowed it to blow up while on the dyno. It wasn't exactly how I would have done it...but it worked OK and made around 880 HP on pump gas. It had 11.0 compression, Brodix CNC 3Xtra's, Super Victor, 1150 carb and a .700 lift *mild* solid roller designed to make cross country cruises. Think Power Tour and Drag Week stuff.

I think that with some opened up heads, a Sniper or well ported Super Victor and some more carb and cam....it could have done great. It also used heavy ring package and no vacuum pump.

I would prefer a smaller package and some RPM to really run strong though.


JIM
 
#33 ·
Now we're talking.....Big Chiefs or Dukes are just flat cool!

But there are some regular heads getting awful close these days.

I think Aukai's is going to be fun to watch as it develops.


JIM
 
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