Well a buddy of mine has a 67 chevy truck with a 350 carb motor in it, he has over 6 grand into just the motor, I'm not sure exactly what he's done to it, but he built it from the ground up and he has that much money into it. Its definately a screamin truck. He's been wantin to race me for a while so finally, last night I didn't back down. We set up for a 1/4 mile race, my 92 12 valve verses his 67 chevy full blown 350. I haven't been wantin to race anyone lately cuz i'm afraid I'll blow a head gasket cuz I'm pushin 40 lbs with this he351 turbo i just put on. Well we lined up and turned my KSB on, locked it out of overdrive and I was manually shifting my auto, and i was powerbrakin it. The race started and i had in first, and he got off the line a little quicker than i did, but then I got my RPMs up and my turbo spooled up to 40 lbs and shot out a flame out of the hood stack and i took off and was ahead of him by a little, then i shifted up to 2nd and pulled away from him even more, then I shifted into Drive, or 3rd gear, and i pulled away a little more, I was probably ahead of him by a car length, but then he started gainin on me, and i had the pedal to the metal, he then passed me and i wasn't gonna catch up to him so i just let off and decided to save my motor/head gasket, cuz i didn't wanna screw anything up. He passed me and just kept pullin away from me, but yet i wasn't acceleratin anymore either. I was runnin 40 lbs of boost the whole race til i let off and i only hit 1300 degrees, I am very happy with this turbo and how cool it runs! but I need more topend, my truck is great off the line and will definately set you back in your seat, but it seems to fall on its face top end. I have my pump pretty much maxed, with the afc lever out and the full power screw in about as far as i wanna go with it,(I haven't hit runaway but i think I'm close) I have the 366 spring, the timing bumped 1/8 and the KSB hotwired, the he351 turbo which i really like!!!! and i have an ASA intake, which i moved up so the filter is stickin up out of the engine compartment gettin cold air while i have my hood off. I still have stock injectors and a stock tranny, and i know those are holdin me back, but what else can i do to get more top end??? I have already bent my pedal and put spacers behind it and moved my high idle screw as high as it will go. So what else can i do to get more topend??? thanks

 

How high were you reving the engine? Mine seems to pull hardest below 2500 rpm. I guess that is where the peak tq is. I only rev past that once I am in overdrive to get top speed.

 

dude your power, its just not getting to the ground because the converter. get a tight converter in that thing and get rid of the stock slippery one and you'll blow him away every time.

Advance the timing more for more mid-top end power, you'll lose a little bottom end but thats ok because of your 9cm housing.

yea your timing is only at 1/8, you got alot more to go, put it to the head is my advice.

and lemme tell you he's got something in that 350 he ain't tellin you about... like maybe a 383... to get YOU off the line with a 9cm housing and a diesel with all that fuel.... hes' got some low end torque it sounds like. Does it lope like a big cam ??

 

a 383 is just a 0.060" bored 350

I bet if you were able to open up that wastegate you would get more top end. High turbine drive presures = LOTS of pumping losses. I woulda done that race with overdrive. Diesel's make their torque in lower RPM's, take advantage of it.

You are loosing a lot in your tranny just like me. Boost is nice, but if it comes at the price of high pumping losses, all you are doing is pumping air. I know it's a better 9cm housing than the Hy35, but it is still only 9cm. That wastegate needs to open. I know that once it's clocked the mount is gone (I have a Hy35 and a he351 myself), but maybe one can get fabbed up. Good luck

-Luke

 

A .060 over 350 is not a 383,it is a 360. Also in his post it says it is a blown 350,if he meant with a blower, it stands to reason he got smoked.

 

NO its not, #1. Nobody bores 350's .060 over anymore, If you do your crazy, the cylinder walls would be so thing you could see through them. And a 350 bored .060 over comes out to 358ci anyways... not 383 LOL

If a 383 was a 350 bored .060 over it wouldn't be a stroker . If you don't believe me read here http://www.383stroker.com/
A 383 stroker is a 350 bored .030 over with a 400ci crank, it comes out to 3.75" stroke, alot more stroke than stock .

383 strokers greatly improve top end power over a 350, not matter whats done to the 350.

You'll get him next time smokin'

 

I have seen small block chevys with less money in them than that in a fullsize pickup run low 6's in the eighth. I dont think you are giving the gasser enough credit. It isnt as easy as you think to run that fast with a diesel.

 

He said he had a car length on him

 

Ya that's what it is. A punched and stroked 350. I just mis spoke from the several racing lobster boat engines I've seen in the engine garage that dad had his 468cid built out of for his boat.

And sorry man, but you can't say NO ONE punches 0.060 on a 350. I know there is a lot I havn't read about that has been done at MY tender age. I'm sure there has been MORE done that hasn't been read at yours. Don't believe everything you read on the internet all the time.


Smokin': Just because you can roll coal and you have 40psi of boost doesn't mean you are making the best power. Let that girl breath by having that wastegate open a little. We're not looking for air PRESSURE, we want volume and low pumping losses.

As for racing: Weight can be a huge factor in that as well. That 350 gas job might be a bit lighter. IDK what your W250 weighs, but my W350 is right around 8000lb. There are trucks weighing a full ton LESS than mine which takes a lot less power to giddy up.

 

I'm going by what my 53 year old Dad said. He's also been buidling SBC's for 30+ years and if you're running a near stock coolant system, .060 over is dangerous. Thats all i was saying, sure theres dirt trackers out there borin .060 over to make the most power and still make the CI. limit but a daily driven truck/muscle car, I would never go .060 over.

 

if you would have let the trans do the shifting and left it in OD (if your T.V. cable is set up right) you would of had more top end. I have 3.54 gears and i am out of the peak range of power by 55 when locked out of over drive.

 

ya, I feel almost a lurch when I go into OD. Getting back into my torque band. Yankin a big hill by my house that is 25 at the bottom, but goes to 55 in the middle, I can feel the girl pull speed up better in OD rather than take it out and wind it up more since my 366 spring isn't in yet.



See, uou thought of someone that punches 60 thousandth's. I can think of many more. And the main reason people punch out bores is not to get more power, it's to recondition the walls of a worn cylinder. 0.060" is just the second rebuild, or the first if heavy scoring is evident. Just don't critisize and say NO ONE does this, because it does happen for many reasons for different applications. However yes, I'll admit I mis spoke that it was a 383

 

I'll wade in on the Chevy 350 subject. Not all 350 bocks are equal and I am talking about the four bolt main ones. Around the area of the front cam bore, if the casting is equal or near equal all around the bore , those blocks will bore .060 inches with no problem.

 

Go to a 1/4" to 3/8" timing bump.

With the KSB on, hold the brakes and build to 10psig boost then launch (in 4wd if you've got it).

- DON'T build the boost and then hold it for 20 seconds! I say that not because it might damage something (it won't right away). I say that because holding it at that power level heats the fluid in the converter VERY fast and as such is much thinner and will make it slip A LOT more off the line.

Everybody get set, build the boost, and nod at him as you launch. Just that quick.

 

you need a mario cart banana to put in his lane to wipe him out of the race.