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  1. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    We tried the short yellow secondary springs and it created a rich spot when the secondaries hit. Meaning they came in too early. This causes the car to stumble slightly and then catch up. My tuner says that it may feel faster (like the car just had the turbos engage) but in actuality it is...
  2. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    Reply the Hindle Running 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...
  3. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    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...
  4. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    The 60hp should not only come from the x pipe, but the hp that is gained with increased RPM. If the engine could breath probably to 6000 rpm, then at the current rate of hp increase, the engine would have hit 250. I through in an extra 10 hp for a better design (like an x pipe). Does that...
  5. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    I think it is more the 2.5" diameter vs 2.0" instead of the actual X vs H. But both tuners said the X vs the H is a noticeable improvement. It can only help. A 2" diameter pipe cross sectional area is 3.14 square inches vs 4.9 square inches. That is a 56% increase ! ! That has got to...
  6. 7

    1970 351C Dyno Numbers (you should all be interested in this)

    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...
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