Trying to start this 306

Discussion in 'Technical' started by Joebug, Jul 10, 2010.

  1. justin has a 74

    justin has a 74 Maverick bandit official

    Joined:
    Sep 18, 2008
    Messages:
    3,758
    Likes Received:
    9
    Trophy Points:
    112
    Location:
    kentucky
    Vehicle:
    74 maverick /71 grabber /72 maverick

    uh... those arnt roller pushrods:naughty: I thought they were around 6.4 unless this is a flat tappet cam.:huh:

    go to some auto parts place and ask for an 87 mustang gt roller pushrod
     
  2. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    yeah its a hydraulic flat tappet cam ....
     
  3. baddad457

    baddad457 Member

    Joined:
    Feb 24, 2007
    Messages:
    5,861
    Likes Received:
    141
    Trophy Points:
    171
    Location:
    Opelousas La.
    Pushrod length's about right according to what Comp lists for your combo (6.85) If the block and heads have been milled too much, they could be too long now. Use a magic marker to paint the rocker tips, then bolt down the rockers and cycle the motor thru two complete revolutions, then look at the wear pattern on the valve stem tips. The pattern should be centered of close to it on the tip.
     
  4. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    I had a nice centered wear pattern before I just added these shims, now that I added the shims I'm sure its not the same. But for now at least I decreased some of the preload. One cyl. Didn't require a shim on the exhaust and another cyl I had to add a thick shim... I guess I will fiire it up and see what happens unless I can try something else, any suggestions? Thanks for the input!
     
  5. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    Well if it still gives me trouble I will try the marker trick to see where it is hitting the valve stem. If the pushrods are too long what are my options? Also, how do I know how much shorter to go?
     
  6. Dave B

    Dave B I like Mavericks!

    Joined:
    Mar 9, 2002
    Messages:
    16,931
    Likes Received:
    214
    Trophy Points:
    347
    Location:
    Parts Unknown......
    Vehicle:
    3 Grabbers
    Even with the incorrect push rod length, it should fire up and run.
    I have E7TE heads on a 73 302, and mine ran with the pushrods too short, it just sounded like a solid lifter motor.
     
  7. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    ok, just fired it up and same ****...no difference...keeps backfiring through the carb and wont stay running...tried moving the dizzy either way with similar results...I dont know what the deal is with this thing. I am certain I had the dots lined up on the cam and crank. I'd hate to have to pull it all apart but i dont know what else to do.. any suggestions?
    maybe its something obvious that i over looked? Anyone in the Hudson Valley NY area that can stop by and take a look see at this thing? lol
    Well, with nothing else to try what do I do now?? unless I reall screwed this thing up by not setting the preload at the proper location ...could that have anything to do with it?
     
  8. baddad457

    baddad457 Member

    Joined:
    Feb 24, 2007
    Messages:
    5,861
    Likes Received:
    141
    Trophy Points:
    171
    Location:
    Opelousas La.
    If there's too much preload, it can do what you describe. It'll be holding the valves open. Take all those shims back out and just torque the rocker bolts down to 25 ft/lbs. and see how it runs.
     
  9. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    I thought by adding the shims it would decrease the preload, I already had the shims out and torqued down to 20 ft/lbs ... Maybe I should just go with traditional rockers with studs? I noticed too that while I had the covers off the rockers didn't look like one was higher and what not, they all looked relatively in the same position, I thought this was odd but figured that the lifters weren't pumped up... I don't know... Just frustrated with it right now... But I can give your suggestion a try.
     
  10. baddad457

    baddad457 Member

    Joined:
    Feb 24, 2007
    Messages:
    5,861
    Likes Received:
    141
    Trophy Points:
    171
    Location:
    Opelousas La.
    :banghead: Ahhh, you're right, I had a brain fart. :16suspect Leave the shims in.
     
  11. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    Ok what do you think about going with tradtional rockers with studs rather than these non adjustable pedestal mount type?
     
  12. baddad457

    baddad457 Member

    Joined:
    Feb 24, 2007
    Messages:
    5,861
    Likes Received:
    141
    Trophy Points:
    171
    Location:
    Opelousas La.
    Unless you've got a really wild cam, I see no point in it.
     
  13. Joebug

    Joebug Dude with a Maverick

    Joined:
    Oct 14, 2009
    Messages:
    140
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Hudson Valley,New York
    Vehicle:
    1971 Maverick V8 2dr coupe
    I have been thinking about this thing all night.. now the last time this car ran I took it down the road ( not too far, it died and i ended up pushing it back) and it did not seem to shift properly either, my point is... if the vacuum line has disconnected from the transmission is it possible the engine would not run correctly because of that? I know the tranny is pulling a vacuum off the intake manifold but would it cause this type of (non) running behavior? The reason I ask is because after I tried starting the car lastnight, as it was trying to run, it had no response to throttle position.... it just didnt want to run no matter how much or little gas I was giving it... what do you think?
     
  14. darren

    darren Member

    Joined:
    Jan 5, 2009
    Messages:
    4,852
    Likes Received:
    45
    Trophy Points:
    113
    Location:
    East of Dave
    Vehicle:
    72 302 Maverick
    Without reading this entire thread I ask do you have a fresh. clean fuel supply?? Been burned on it many times.
     
  15. justin has a 74

    justin has a 74 Maverick bandit official

    Joined:
    Sep 18, 2008
    Messages:
    3,758
    Likes Received:
    9
    Trophy Points:
    112
    Location:
    kentucky
    Vehicle:
    74 maverick /71 grabber /72 maverick
    I think its the dizzy:hide:

    Wasnt the car running when you bought it? what did you do to it?
     

Share This Page