Dyno'ed the Mach today.....>

I was pleasantly surprised by my 1970 Mach 1. The 351C-4V was factory rated at 300 “gross” hp new from the factory in 1970 and converting to the net system they use now days would be around 240 “net” hp but when you compute the rear wheel horsepower it should have been around 205 to 210 rwhp. It did 248 to the rear wheels with 309 torque.

My only mods are headers with Flowmasters, a 600 cfm Holley and a single plane "X-Celerator " maniflold by Weiand. The manifold is designed for much higher rpms than I currently attain. The stock cam is through by 5400 rpms and the single plane intake is designed for 7000 + rpms. I like to swap it out for a dual plane Edelbrock Performer Manifold which would work better with a mostly stock engine.

Anyway, I was happy. One guy had a '73 Mach 1 which had a "cam" and other work done but only did 200 rwhp behind a automatic transmission. The motor only had about 500 miles on the rebuild while mine has about 5000 miles.

Hello! Bill

My engine with stock carb autolite 4300 on dyno = 260hp

with 428 carb Holley Ford 735 CFM = 351.7 hp

my cam is: competition cam dual energy #32-208-3.

The car run great.. Ray

Anybody else out there dyno'ed their Mach 1's? I's like to hear your numbers and mods if you have made any.

My '03 Mach 1 with 5-speed also did 280 rwhp/302 tq with only a K&N CAI. Let's hear some numbers

Bill,
this thread has been dry since December. So I felt compelled to respond in some fashion... Just not exactly what you are looking for....
If I had a 1970 Mach 1, I would gladly share my dyno numbers..
I would if I could, but I can't, so I won't!!

I Dyno'd my 70 Mach1 back 2 years ago.
I had Open Chamber ('1972) heads on it with forged pop-up pistons for 10.4 to 1 compression, not quite as high as a stock 70 Celveland which has 11 to1.
Also had a 750 holley Vac Sec, Edelbrock Performer dual plane intake, small Crane Cam (.510 lift), and headers.
I got 292 rwhp (5,000rpm) & 340ft lbs (3,800rpm) at the rear wheels.

I have since redone the heads with stainless valves, chenged to a Torker Single Plane intake, changed to a 650 Holley double pumper, and changed out the Cam to a Cam Research .540 lift grind, added roller rockers and a windage tray ......
Makes way more power now, but haven't dyno'd it yet.
Doesn't respond in low rpm quite as well as the old engine, but it's a 4 spd Close ratio car, so it's easy to "urge" it into the power band, which is 3,200 to 7,000rpm

If you're wondering why such a high reving set-up, I Road Race this car at an amatuer level at Tracks such as Mosport & Shannonville, TMP, etc

Clevelands Rock!

Mach1steve

Mach1steve, I'd like to see your new dyno numbers. I was going to go with a similar cam to the one you put in, but I wanted to keep my rockers non-adjustable for the moment. I was told by Comp cams not to go over .510 lift with the non-adjustable, so thats what I used. I also thought about going with an aftermarket intake, but after taking a good look at my stock 4V intake and doing some reading, I decided to use the stock one. I would not be surprised if the stock intake has better flow characteristics than an aftermarket dual plane. The only real advantage I could see, is the weight on the dual plane. My cam isn't big enough for a single plane. (P.S.) My car will walk sideways from a 30 role, with an automatic trans and 15 inch tires. It's a 70 351c M-Code Mach 1 that came with a factory close-ratio 4spd, but was converted to an automatic.