351cj 2v Stock Horsepower
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Well, my car is still alive (1970 Mach1 351-4v Cleveland, FMX trans, 3.00 gear, Xtreme energy Comp cam 513/519 lift 218/224 duration @.050 with 110 seperation), dual plane edelbrock, MSD 6al, Holley 670 Avenger, roller rockers, custom full length headers, electronic dist with adjustable vacuum and mechanical advances). Here is the skinny on the dyno day results.Read more below for a more detailed account. I have a very similar set up in my 70 mach; however all I know is what's been done externally; I just bought it about 3 months ago (in the for sale section on VMF). Setup is 351C; Edelbrock 750 and intake; MSD 6AL box and pro billet dist.; headers; larger cam but I dont know what; FMX tranny; 3.25 9' rear. Mine also has the small H Pipe.
Biggest difference (from the mods I know) between the two of our is I'm running a 750 cfm carb to your 670 cfm.Best Pull - 266 HP; 327 ft/lbs torqueI too will be going to a tremec in the next few months, and am hoping that will get me to 300 at the wheels, and should easily get me over 350 ft/lbs torque. Sorry 70mach I wasn't trying to flame or anything, and I do understand that your just trying to unleash power that's already there by (as stated above) un corking the exhaust. I just seems like a lot to be expected by doing only that. I mean to go from 202 to 260 on a Mustang dyno that's close to saying that you'll pick up more like 80 RWHP if you consider the percentage difference of RWHP loss shown on a Mustang dyno.
351 Cj 2v Stock Horsepower Engine
Your current dyno number seem really low yes, but again I'm sure the Mustang dyno doesn't help much in that area either.BTW- where did the puney ole 2in H pipe come from? My 302 has Hooker longtubes to 3in pipes to 2 chamber flows to 2 1/4 in tails to 3in tips. I need a crossover pipe (probably run an H for the right exhaust sound w/ flows) and better tail pipesGood luck man I hope it works out for you - let us know what gains you end up with. 2 notes:#1 The new Hp I am talking about (50 to 60+ hp increase) will be seen on a Dynojet + 2.5 dia X pipe. Some of you are confused about my statements.#2 My engine tuner says my carb in plenty big enough (670 Avenger). Infact, my trottle cable was not opening fully (about 3/4 open) when the car put out 201 hp. When the tuner adjusted the cable, the car put out the same exact horspower (202hp).
Basically he said the engine is utilizing as much carb as it needs and it doesn't require the additional air yet. Perhaps after the new exhaust goes on, it will need it.I should also mention.
I am running the Long Yellow secondary spring in the carb. There is still a purple, short yellow and white that are lighter (allows secondaries to come in sooner IF NEEDED. My tuner says that as the engine gets freed up and develops more power, the engine will be able to use a liighter spring.
Once you get to the white spring, the engine needs a bigger CFM carb. So I am still a little ways away from that.A Note: The biggest spring change was when I installed the COMP CAM Xtreme energy. The engine could take 2 steps in the lighter spring direction. That 2' section of pipe is what was throwing me off in our emails. An H is only going to give about 5 hp, but the 2' to the 2.5' is going to make all the difference in the world, IMHO.
With that, and the skewed numbers from the Mustang Dyno, I think that you're going to be in that 250 to 260 range. I'm hoping that you make better numbers than that though, considering your mods.As for the carb size, you've got a good one. A little bit of engine math says that you may even be over carbed. It's all good though. In reply to the?' S you emailed me: I had them shut it down at 5300 RPM's - That was my first time to the dyno and I was getting nervous. It's a 2 1/2' exhaust with Turbo mufflers.
I don't have the print-out with me, I don't know what type of dyno machine it was. My first pull was only 177 HP - the throttle got stuck and would only open about 1/2 way. 2nd pull got me up to about 255 HP; 3rd got me the 266. I'm leaving today for the weekend, but when I get back I'll check the print-out and let you know what brand the dyno was.LanceOne more thing - my air-fuel was dead on, which is why I said you may want try a bigger carb. Reply the HindleRunning the car on another dyno will still tell you alot. What I am interested in is where the PEEK power occurs. I would like to see this at 5500 to 6000 rpm, not 4500 RPM.
Any dyno will tell you that, the hp curve will just be scaled differently. The reason I am switching dyno shops is because the muffler guy I use is 1/4 mile away from the dynojet shop. The mustang dyno I used is about 35 miles away and is not open on Saturdays. Last time I took the day off and spent 4 hours at the shop.
This time I only plan on 45 minutes for 3 pulls right after the exhaust job and can do it on a Saturday.I predict 250 easy on the dynojet. #2 My engine tuner says my carb in plenty big enough (670 Avenger).
Infact, my trottle cable was not opening fully (about 3/4 open) when the car put out 201 hp. When the tuner adjusted the cable, the car put out the same exact horspower (202hp). Basically he said the engine is utilizing as much carb as it needs and it doesn't require the additional air yet. Perhaps after the new exhaust goes on, it will need it.I should also mention. I am running the Long Yellow secondary spring in the carb. There is still a purple, short yellow and white that are lighter (allows secondaries to come in sooner IF NEEDED. My tuner says that as the engine gets freed up and develops more power, the engine will be able to use a liighter spring.
351 2v Cleveland Horsepower
Once you get to the white spring, the engine needs a bigger CFM carb. So I am still a little ways away from that. There's not a whole lot of difference between 3/4 and full throttle in air flow. And seeing as you have a heavy secondary spring in there, I'll bet the secondaries weren't even coming open.
351c 2v Stock Horsepower Conversion
This could also have been why your rpm's were limited and the engine wouldn't rev any higher. You should have changed sec springs while there to see if there was a difference. I'm running a mostly stock 302 roller motor with a vac sec Holley 600, and with a purple spring, it pulls the secondaries open completely. With the spring Holley put in there they wouldn't open either, till the motor got to around 5 grand. Now they come on almost as soon as you nail the pedal, and ther's a noticeable difference when they do come open. I still maintain that you motor needs more carb than that 670.