Recent content by granthendrickson

  1. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    She run’s pretty damn well, I rebuilt the engine around 300 miles ago. She’s got a stock bottom end, .30 bore, heads from a 71 camero, new edlebrock intake, 1103 summit cam, headers and a street fire msd distributor
  2. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Nope I’ve got a avs2 650 cfm edlebrock
  3. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    So the tach is probably just in a six cylinder setting and my rpm at 55 is about where it should be?
  4. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Awesome thank you for the information!
  5. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Sounds good I’ll post what I find
  6. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    I got 3 3/4 turns on the driveshaft with two tire revolutions. How do I find out the gear ratio based on that?
  7. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Sounds good, I’m gonna go get some gear oil and a gasket and change on that while I check the ratio
  8. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Oddly enough this tach (which I bought on Amazon) advertises it works on 4-6-8 cylinders engines however it doesn’t have any switch to change between them
  9. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    According to this the axle is a 3.73 gear stock axle, how do I go about figuring out wether someone changed the gear ratio?
  10. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    The timing light has a tach on it
  11. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    By a timing light
  12. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Okay I just drove it on a backroad, she is shifting into third gear. The tach was saying 3,400 rpm at 55 however it is up by around 220 rpm. The speedometer is pretty spot on. So given that info the rpm’s at 55 are close to 3,180.
  13. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    She’s not quite screaming but she’s definitely up there in the rpm according to my ears lol
  14. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    The tach is up by around 220 rpm according to my timing light
  15. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    It’s an aftermarket tach, I’m in McMinnville oregon
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