[ChopperScott]

Hello ladies and gentlemen. I'd like to share the latest build for my NETO/N Pro-street bracket car...

•Long block assembly by Big Sal's Racing Engines
•Dyno tuning at Bison Engine and Machine
•427 .030 over (434 cu in) Small Block Chevy
•4.155 bore x 4.000 stroke
•11:1 compression
•Dart SHP block
•Callies crank
•Scat H-beam rods
•CP Carillo Bullet pistons
•AFR 245 NPP heads 70cc
•Custom grind .680/.672, 256/264, 108, solid roller cam with 4/7 swap
•Morel Ultra Pro lifters
•T&D 1.6 shaft rockers
•Comp Cams billet double roller timing chain
•Edelbrock 2892 Super Victor II intake manifold
•Wilson Manifolds 1" tapered spacer
•Holley Ultra XP 850
•MSD Pro Billet distributor
•Timing @ 35

•Horsepower: 667 @ 6500 rpm
•Torque: 617 @ 4900 rpm

We tried three different carbs with multiple spacers. A custom built 1000 cfm, a Quick Fuel Q-950, and a Holley Ultra XP 850. In the end, the 850 made the most power. The best pull by the 1000 cfm, built by an experienced carb guy, who was present and tuning it for this engine, was 654 hp @ 6400, and 613 lb-ft @ 5000.

Edit: 10/9/22
• 1.294 (60'), [email protected] (660'), [email protected] (1320')

 

[ChopperScott]

 

[GTAShief]

Did you try it without the spacer? And what size are those headers? Just wondering.

 

[ChopperScott]

Did you try it without the spacer? And what size are those headers? Just wondering.

We never tried it without a spacer, but did try multiple spacers with each carb.

Those are 1 3/4 to 1 7/8 stepped primaries.

 

[GTAShief]

Ahh ok. I've got a 434 myself with same intake. Just wondering. Thanks.

 

[cheapbastard]

Very cool! Thanks for sharing.

 

[BBF612]

2.2hp/cfm x 310 cfm = 682hp

2.2hp/cfm x 340 cfm = 748hp



433.893 Cubic Inches @ 7000 RPM with xxx.00 % Volumetric Efficiency PerCent

Required Intake Flow between 317.7 CFM and 336.6 CFM at 28 Inches
Required Exhaust Flow between 217.8 CFM and 245.7 CFM at 28 Inches

600 RPM/Sec Dyno Test Lowest Low Average Best
Peak HorsePower 682.1 710.1 724.1 738.2
Peak Torque Lbs-Ft 565.8 589.1 600.7 612.3

HorsePower per CID 1.572 1.637 1.669 1.701
Torque per Cubic Inch 1.304 1.358 1.384 1.411

BMEP in psi 196.6 204.7 208.8 212.8
Carb CFM at 1.5 in Hg. 967 1076 1130 1184

Target EGT= 1294 degrees F at end of 4 second 600 RPM/Sec Dyno accel. test
Octane (R+M)/2 Method = 100.2 to 101.0 Octane required range
Air Standard Efficiency = 62.22586 % for 11.000:1 Compression Ratio

Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 673.8 743.6 813.4

 

[ChopperScott]

BBF612, too bad it wasn't ran up to 7000. I really should have had it pushed up further past 6500 to see the curve. It certainly could have handled it.

 

[BBF612]

Well maybe next time, what pipemax shows is the CFM needed for the horsepower made at whatever rpm, so with what some are saying it's quite possible that you might make over 700 hp at 7000rpm.

 

[NPS Nova]

Chopper, what was all done to heads/intake? Headers might be a bit small too from our experience. Back 20 yrs ago (before my time) shop did a pump gas 406 11-1 track 1 heads (227ish cc) Vic jr and streetish style solid roller that made 653Hp @ 6700 nitrous motor (spaying 300+) Used 1150 Pro Systems 4500 and 1 7/8 step to 2" headers.

 

[stuska1]

Cam is too small to make power at 7k with 23* heads.

 

[Oldjoe87]

422 sbc 4.165 x 3.875 afr 245 .753 lift forgot the duration , has 1.6 rockers super victor intake 1000 cfm pro sys carb 1 3/4 headers makes 716hp on c12 @ 6500 and 590 lb ft at 5200

 

[ChopperScott]

Chopper, what was all done to heads/intake? Headers might be a bit small too from our experience.

Manley valve spring upgrade on the heads, minor port matching on the intake. The heads are competition ported at AFR. The dyno headers were 1 3/4 to 1 7/8 stepped primaries. In the car I've got 1 7/8" x 29" primaries to 3 1/2" x 10" collectors with turn downs for the track.

 

[GTAShief]

Chopper, what was all done to heads/intake? Headers might be a bit small too from our experience. Back 20 yrs ago (before my time) shop did a pump gas 406 11-1 track 1 heads (227ish cc) Vic jr and streetish style solid roller that made 653Hp @ 6700 nitrous motor (spaying 300+) Used 1150 Pro Systems 4500 and 1 7/8 step to 2" headers.

I had new headers made on my car. Went from 1 3/4" to 1 7/8 to 2". Picked up .12 in the 1/8th.

 

[NPS Nova]

GUYS I would have to get with shop owner as this was WAY before my time there. BUT this was just a pump gas street car back in 2001.

 

[Steve.k]

Hello ladies and gentlemen. This seems like a more appropriate section to post this. I'd like to share the latest build for my NETO/N Pro-street bracket car...

•Long block assembly by Big Sal's Racing Engines
•Dyno tuning at Bison Engine and Machine
•434 cu in Small Block Chevy
•4.155 bore x 4.000 stroke
•11:1 compression
•Dart SHP block
•Callies crank
•Scat H-beam rods
•CP Carillo Bullet pistons
•AFR 245 NPP heads 70cc
•Custom grind .680/.672, 256/264, 108, solid roller cam with 4/7 swap
•Morel Ultra Pro lifters
•T&D 1.6 shaft rockers
•Comp Cams billet double roller timing chain
•Edelbrock 2892 Super Victor II intake manifold
•Wilson Manifolds 1" tapered spacer
•Holley Ultra XP 850
•MSD Pro Billet distributor
•Timing @ 35

•Horsepower: 670 @ 6500 rpm
•Torque: 617 @ 4900 rpm

We tried three different carbs with multiple spacers. A custom built 1000 cfm, a Quick Fuel Q-950, and a Holley Ultra XP 850. In the end, the 850 made the most power. The best pull by the 1000 cfm, built by an experienced carb guy, who was present and tuning it for this engine, was 654 hp @ 6400, and 613 lb-ft @ 5000.

View attachment 298763

View attachment 298765

Seems like excellent power. Especially when you consider relatively low compression( especially by today’s standards) and look at peak rpm. 6500 rpm that engine will live for years. Im a ford nut but i see no reason I wouldn’t like that street performer. Good work.

 

[ChopperScott]

Here's the car it is intended for...

 

[ChrisL66]

That should be fun! My 12.5:1 400" sbc made pretty much the exact same HP & torque numbers, but at with a little more RPM and needs VP C12. My cam specs are pretty similar but I've got the AFR 220 competition ported heads and an old Brodix manifold that has a lot of work done to it. Looks like a cool ride!

Chris.

 

[ChopperScott]

My 12.5:1 400" sbc made pretty much the exact same HP & torque numbers, but at with a little more RPM and needs VP C12. My cam specs are pretty similar but I've got the AFR 220 competition ported heads and an old Brodix manifold that has a lot of work done to it.

Chris.

Very nice. I'd like to do a high compression 406" sbc with those same heads for my next build.

 

[434 nova]

Nice build.
I did a pump gas 434 years ago with afr 235 heads
10.9 compression
28 degrees of timing
264-272 @624 654 lift on a 109 lobe sep
Afr 235 heads 70cc Harland sharp roller rockers
2925 intake
Prosystems 1000 cfm 4150 carb
1 7/8 headers
4000 stall 10 inch ptc nitrous converter
4.11 gears
28x10 slicks
10.16 @ 132 1/4
6.39 @ 110 1/8
1.43 60ft off the footbrake
Weight was 3400#s
Plugs was lean I never got around to jetting the carb and playing with the timing
I figured it made 650hp or so.