I would not be surprised if you find another 40 hp with a bigger manifold and well-ported heads.

Finding a low deck single plane took a while! Glass 6 pack hood on the way!

I used to port the crap out of Street Dominator manifolds, oout of the box they flow about 270 if I remember what 440Jim posted but ported they will go 310 plus. My ports usually wind up 1/2 way between 906 and max wedge size but since you have standard port windows prolly wont pick up that much.

I agree that the cam is a good choice for a no prep stick car, pretty narrow torque/HP curve which is perfect for a light stick car

The heck with more motor work. I'd be saving up for a trans
Doug

Me thinks he has several different choices to use in his shop, HUH Jeremiah: whistling:

I wanna drive it !

You make an excellent point there. The transmission and clutch are maxed out with this engine on a power adder. A g force 101a will replace the a833 at some point.

My original plan was a smaller porter racing heads street roller cam and stealth head upgrade to the 451. That block is headed to get a sleeve and some good rods this winter. It will be interesting to see how much n/a power can be made with the stock manifolds.

My combo is similar but with better heads but less cam. 272.279 solid roller, Stage 6 heads, 850 Quickfuel carb, 12.1 CR on Av Gas since its the same price as normal fuel down here, I get 645 rwhp & gets my factory trim e body @ 3720lbs running 10.5@125mph. I could probably run faster with a bigger carb but I built this to race in our 11 zero class on the Friday night drags. When its colder & no track prep, 10.80s are the norm, just have to sandbag at the finish line.

645 wheel hp is no joke. I would be very happy with 650whp on the wheel dyno on a small n20 kit. My previous best with the 451" was 572whp on a 175 shot. Thinking I can run either a lean 125hp tune up or 150hp jets pulling some timing to reach my goal.

Naturally all of that hp gets skewed off the chart when the clutch tamer, n20 progressive and erratic track conditions come into play. Add in the flashlight start and it's anyone's guess if we are leaving off of the progressive's time delay or not lol.

Junk. It didn't meet your torque goal. Just kidding!!! That's a really cool combo and I'm surprised at the power w/ unported Stealth heads!
That car should really make some people scratch their heads after it makes a pass! I love these type of bada$$, but unsuspecting builds.

To those questioning the size of the cam...remember, it's a nitrous motor. That changes things. I've seen some crazy big cam specs for motors that if weren't being sprayed hard, you'd think were WAYY overcammed.

All of my custom n20 cams have longer exhaust duration.

This thing also needs moderate RPM to do it's thing. I can't leave off idle or anywhere down low like an automatic; I need RPM to slip the clutch and keep the nitrous kit from sending the carbutetor to heaven. With a 4.10 gear and a 28" tire my usable down track rpm operating window is 4400-6150. At 4400 RPM we are making within 20 ft-lb of peak tq and 500hp and by 5100 RPM we have picked up 100 hp and it carries until redline. Lastly, the engine makes just short of 600 ft lbs at 3900 so I am not really sure why we are calling it a narrow power band. Maybe someone has a dyno sheet from a similar build as an example? I have had a few people indicate the engine is down on power yet no one will tell me why lol.

Maybe a couple : D

That said the face plated a833 has served me well. I ordered a spare set of gears and a cluster and have not had cause to use them. Slipping the clutch is the only thing keeping it alive. I also adjust the RPM window switch to turn off the nitrous below 4500 and above 6100 which really helps on the 2-3 and 3-4 shift.

If any of you automatic guys want to know what it feels like to shift out of 3rd gear let me know : D. Just having fun no disrespect intended.

Thank you Nick it has been a humorous and entertaining journey. There are so many facets to gettijg a csr like this to work half way right sometimes I am like a blind man trying to open a can of beans with a swiss army knife.

I am looking forward to seeing where your fury upgrade goes. These street cars can be pretty darn fun with a little nitrous don't you think?

Do you know what the flow nu,bers for a CNC ported stealth look like? Who has the best program?

Wheres the cage?
Doug

Down on power ??? I think not, for the cyl head you are makin some STEAM, cant wait for the track results !!!!!

Unless you wanted to run totally N/A I don't feel like there's bang for the buck having them cnc'd. I'd think there is that same '40HP' or so just doing a few hours of MW opening to the intake runners and then using a MW intake which would carry power further. It's a strong build for unported stealth heads! Them being small and that you were using low compression for pump, AND in consideration of the valvetrain; I may have missed on the cam by 5HP and for that I'm so sorry . I'd have thought it would have power peaked about 200 higher but not exactly sure where the ICL is at currently. I'd bet moving it would shift peak for sure. I don't recall if you mentioned how much spark adv made the best power? For whatever reason, your builds go relatively unnoticed (and maybe that is your goal) but they are impressive relative to the parts you're using. Again overall GOOD JOB!

I haven't read everybody's responses, so this may have been mentioned already...

It's only a "narrow" power curve if all you do is compare the HP peak RPM with the torque peak RPM. If you look at where the torque is > 550 lb-ft, the answer is "almost everywhere".

I think the HP NA is maxed w/ the unported heads; if you port the heads, the next restriction is that intake. If you always spray it to your horsepower goal, I don't see the point in changing what you have now.

Does that car have to pass tech to race where you do? I don't see much there that says you do...

Nice build. Those heads seem to be decent heads. A friend of mine had them out of the box on a mild 440 with small roller and 6 pack set up and in a 4000# 71 road runner and went 11.50's. As for the cam being too big, I don't think so. I have seen this before, small heads large cam just seem to work good together. Dom@Thumpercarbs has something similar with large cam and small head. A 470 with RPM's and a 276@50 on the cam. This is in his 72 dart and goes 9.70's N/A. I have read somewhere that large cams compliment small ports. This is looking to be true.

That's a fantastic quote!!!

It's super cool, there isn't anything more exciting than a quick manual trans Mopar. It should really, really fly on the hose!

My car is overcammed for n/a work, but it worked great on the nitrous. It picked up 1.2-ish seconds on only a 73 jet, the added duration really helps. It's addicting for sure, doing caltracs/monos/vikings on all 4 corners this winter, and am going to possibly upgrade the fuel system so I can feel safe spraying 225+... at least from a tune standpoint, not from a stock LY rods and six pack pistons standpoint, lol