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  1. Engine Tech
    I’m installing a Comp Cam CL34-227-4 High Energy with hydraulic flat tappet lifters. Summit specs say that aftermarket valve springs are required for optimal performance, but many people I know as well as some reviews say that the stock springs worked for them. I’m wondering whether or not I...
  2. Engine Tech
    I have a bone stock 77 460 that I want to add some more life to for my 2wd f150. I plan on doing the exhaust port of the d3ve heads, switching to Wiseco PTS530A3 flat tops to bump the compression up, using a Comp Cams Mutha Thumpr 234/249 hydraulic flat tappet cam, Holley 750 carb, new intake...
  3. Engine Tech
    Hello. In about a week i’m going to be picking up an obs f250 with a 460 and a zf5. i’m looking to eventually cam the motor with a comp cams thumpr cam. i was wondering what are some good valve springs to use, if i should get some different push rods, and if it’s worth getting the thumpr cam kit...
  4. Engine Tech
    I have a 1986 f250 460 it has a holley sniper tbi with the holley hyperpark ignition and distributor it has flowtech headers no smog pumps or egr weiend stealth intake manifold and top dead center timing gears it was running great but I decided to swap the cam out for a little more power I...
  5. Engine Tech
    So I wiped a lobe on the sum-3500 cam I installed a couple months ago after what appears to be a lifter failure. It made it through 2 break in cycles and about 10 min of driving. Every thing was good and although on the high side of the tolerance it was in spec. That brings me to needing another...
  6. Engine Tech
    Hello everyone, I'm new to the forum and I'm sorry I'm sure this has been asked before. I just installed a cam in my EFI 460 and I think that it is running lean, I'm still running the Speed Density but I have the Holley Terminator X EFI kit to go on it, but I'm waiting for the TFI adapter to get...
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