69 N.O.X. RATT

I have spent the last 10 years off and on building the motor for my 69. The car is going to be done in Febuary. I will take it to get it chassis dyno'd. I will post the numbers. I am looking for numbers without the nitrous.
454 + .030 (460)
6.135 rods, ZL-1 design
Comp solid roller .647 / .653 242 and 244 at .050
JE forged 10.5 pistons
Edelbrock oval port Performer RPM heads, no port work, 2.19 1.88
Edelbrock Performer RPM Air Gap intake
Jet stage 3 Holley 850 double pumper flowed to 920. Several mods to carb including choke horn milled etc.
Hooker coated 1 7/8 header
MSD everything
Roller rockers

Other goodies, Fluid damper, ARP main studs, ARP head bolts, under drive pulleys converted to serpintine belt, Moroso 7 quart pan, Griffin radiator with dual electric fans.

NOS Sportsman Fogger plumbed into the Air Gap adjustable from 100 to 300 HP. NOS activated by WOT switch. I will run the 100 shot on the street. Adjustable timing system that works from the inside of the car + or- 15 degrees.

Richmond 6 speed, 2.77 first gear, 1 to 1 fifth and .62 6th. 3.36 gears. Centerforce dual friction clutch

Forged stub axels, solid U joints, welded frame stiffeners from Toms, also Toms bushing eliminator kit.

1 1/8 front sway bar, 3/4 rear, 360 fiberglass rear spring, 550 front springs, bilstien shocks, poly bushings everywhere.

Two seperate fuel systems, one for motor one for Nitrous, each run by a Holley Blue pump.

I am very open to critiques or suggestions to parts I should have used. If I could do it over I may have used other heads, maybe Rec. port stuff. I would have gone to a bigger intake, but hood clearance issues prevented that.

Thanks

:chevy

Alwyn678

10 years :eek: wow...Sounds like a sweet set-up though

gkull

Very nice

You have two things that will keep that motor from making massive hp. and Desktop dyno will point them out. Your cam is a good mild intake duration. But it should have a larger split duration and your header primaries should be larger. Don't get me wrong I don't know what your plans are. I just went way to mild with my 383 with a solid roller and @240/248 .635/644 in my small block. I have a port injected NO2 system for 125- 500 hp The guy I got it from kept braking crankshafts in his 420 ci Small blocks at the 375 hp level.

Then when your on the bottle you really need to have the freest flowing exhaust you can.

I could run it for you tonight after I find the head flow cfm at each .100 lift

gkull

One other thing do you have the lobe sep. angle from the cam card? Is the cam a normal solid roller or more aggressive ramps?

69 N.O.X. RATT

the lobe seperation is 110. I do not know if it is more aggresive on the lobe angle or not. It is the Comp xr 280 r. Thanks for the input

bence13_33

Let's see here, I plugged your information into Desktop Dyno. One downfall with Desktop Dyno is the fact that it only gives you the choice of a single plane or a dual plane manifold....the Performer RPM Air-Gap should flow better than most normal dual plane manifolds. Anyway, I plugged your information in using a large tube header with muffler exhaust and here are the numbers (if you want a print out I could send you one).

5500RPMs - 547 Horsepower (Peak Horsepower)
4000RPMs - 566 Ft. Lb Of Torque (Peak Torque)

Hmmm....seems like you should be making more power (A LOT more power). I believe you are leaving some power on the table somewhere? Like I said if you want a print out I can e-mail it to you.

gkull

Bence you would have to use small tube headers in that field. Big in big block is 2 1/8 up

These small block headman headers are 2 1/8

bence13_33

gkull:
What would 2" primaries be considered (that's what I'll be running)....you said 2 1/8" and up are considered large tube. 2" primaries are pretty big...not sure if I would classify them as small tube. *sorry I'm getting a little off topic*

I re-dyno'ed the setup using small tube headers with mufflers and came up with:

5500 RPMs - 540 Peak Horsepower
4000 RPMs - 562 Peak Torque

69 N.O.X. RATT

Thanks for the help. When I built the engine I thought it would make around 580-600 HP through open exhaust.

69 N.O.X. RATT

GKULL: Thanks for the remarks, I was thinking the intake and heads where the weak link, not flowing enough, any thoughts :chevy

Flareside

I think you're right. Oval ports and solid rollers don't match up too well. You've got a cam that makes most of it's power at high rpm, and heads that won't let you get there.