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  1. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

    Yes, the picture above shows the clearencing.
  2. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

    I guess my advice would be to stay away from that dyno shop? Maybe find another dyno shop. More pictures.
  3. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

    More pictures
  4. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

    Of course, and a video as well.
  5. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

  6. Mark Jones

    I'm Going To Build A 650 HP 496 With 781 GM Oval Port Heads

    My plan is to build this: A BBC with a 4.310 bore and a 4.250 stroke, 9.8 compression, ported 781 GM oval port heads 1.880/2.190 valves, 238/248/578/608/110 hyd roller cam, performer RPM air gap intake, 850 Holley carb. Some pictures.
  7. Mark Jones

    402 Experts... Tell me what you know

    If a person must use a closed chamber head IMO the 390 casting and the 702 are the best one to start with. Example of a 390 head with a 1.880/2.190 installed with the chambers unshrounded.
  8. Mark Jones

    402 Experts... Tell me what you know

    No offense taken, I don't expect everyone to fall in line with my thinking, theres reasons why I do things a certain way, which might not make sense to everyone.
  9. Mark Jones

    402 Experts... Tell me what you know

    SCE makes the smaller bore head gaskets.
  10. Mark Jones

    402 Experts... Tell me what you know

    Not trying to change anyones mind here, but if I built a 402 with a cam with 240 degrees @ .050 I guarantee it would be over 500 HP. I build 375 HP 396s for NHRA stock competition, 840 rectangle port heads with factory installed 2.190 intake valves. We never use factory spaced bores on a engine...
  11. Mark Jones

    402 Experts... Tell me what you know

    "bolt on Procharger" You sure get around Bill...............
  12. Mark Jones

    402 Experts... Tell me what you know

    I use a Racetec in my 396/402 builds, they build me anything I want.
  13. Mark Jones

    402 Experts... Tell me what you know

    I would never do this. The bore is not big enough to utilize a 2.190/1.880 combination. The 049 - 781 head has to big of a chamber for a 4.125 bore, you would need a big dome to make this work, then heavy metal to make it balance. ]The best combination IMO is to use the 292 head (402) with a...
  14. Mark Jones

    402 Experts... Tell me what you know

    A good stock but blueprinted rebuild with a hyd roller. Feel free to send the 402 heads my way!
  15. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks for the nice comments. If you like the 427 build you will really like this one: vortecpro-454-peanut-port-engine-build-and-drag-test.794225
  16. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks Catbox, I will let you know how it runs at the track!
  17. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks, you might not know but I'am moving to Georgetown Tx I came here because of this:
  18. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Heres some pictures you might like.
  19. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Ok........lets get the correct information out there. 396 and 427 cranks are not the same, although they use the same fordging number. The third counter weight on a 427 crank is thicker for the heavier pistons in the 427. Both 396 and 427 share the same stroke 3.766. The early 6223 crank is NOT...
  20. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks
  21. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks
  22. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks
  23. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Keep in mind the goal was not to make big HP, the goal was a smooth idle with a factory 350 HP 396 cam or 427 390 HP hyd cam with the factory intake and a Q-Jet. I like it a lot.
  24. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thanks, smooth idle, sounds stock.
  25. Mark Jones

    I'am Going To Build A Smooth Idle 427

    Thank you. My cam grinder RED LINE used a 1960s GM cam core, then I found 1970s new TRW hyd lifters because I wanted complete reliability with the factory GM lobes. I clean all cast iron In a hot tank.

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