shovelhead/four plugs

Discussion in 'Engine, Fuel and Exhaust' started by mapleshovel, May 27, 2012.

  1. mapleshovel

    mapleshovel Member

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    hey guys so i have 74 shovel,loud ticking when hot is that the pushrods that need adjustment?so my shovel got 2 coils and four plugs?i dont see that anywere else,how come?i run points,plugs have 30 gap.is that good or should they be more like 40 gap?thanks
     
  2. Breeze3at

    Breeze3at Well-Known Member

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    The ticking when hot could be the push rods needing adjustment, or it could be that they are solid lifters and will always be noisy. Checking is the only way to know. Some use heavier oil (60 or 70) in Shovels to quiet them down. Two plugs in each cylinder is for better flame propagation in the hemispherical combustion chamber. A popular performance modification. A .030 gap is ok with points. Electronic ign. is about 40.
     
  3. mapleshovel

    mapleshovel Member

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    thanks for the info
    i run straight 50 oil,solid push rods cant be adjusted?
    should i be using heavier oil?
    thanks
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    Check for an exhaust leak also, shovel heads were famous for the header pipes leaking, also make sure plugs are tight
     
  5. Breeze3at

    Breeze3at Well-Known Member

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    There's as many opinions on what weight oil is best in a Shovel as there are oil threads on the web. I use 50 all year long in Ga. because I can find it easy.
    Solid lifters can be adjusted to zero lash cold, which is different than hydraulic adjustment.
     
  6. mapleshovel

    mapleshovel Member

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    thanks guys
    so yeah i got exhaust leak,my pipes got one bolt on there,drag pipes i put new gaskets but still leaking,should i double up on gaskets?
    should i get a pro to adjust my push rods?
    he says it takes him 20 minutes,charges me 40$$
    can i do this myself?
     
  7. Breeze3at

    Breeze3at Well-Known Member

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    Not knowing your mechanical ability, and the price of $40, I'd have the pro do it. They you can be sure if you have solid or hydraulic lifters and know the procedure for adjusting. Also ask his opinion on the exhaust gaskets. There are several shovelhead exhaust fixes on the market. Be VERY careful with that one bolt in each port. The alum strips easily and it's an expensive fix.
     
  8. Jack Klarich

    Jack Klarich Expert Member

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    Ultra Copper RTV and the right torque should solve the exhaust leak, line every thing up first and start at the head and work back to the exhaust hangars, as far as the 40 bucks to adjust the push rods to me that aint bad tho you may ask him to write down detailed instructions for you:s
     
  9. mapleshovel

    mapleshovel Member

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    awsome thanks guys
    cheers
    roger
     
  10. the draggin

    the draggin Active Member

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    Just a thought, replace the exhaust bolts with studs. Use the laminated gaskets (copper/fiber/copper) and start at the head and tighten the rest after you have the head bolt/stud nut torqued down. The lifter noise is almost a given with a Shovel, the expansion of the cylinder is greater than the expansion of the lifter/pushrod length so after the engine reaches operating temp the ticking is there. You might check with Tank about if a straight weight synthetic can be used in the Shovel, personally I don't see why not. This would no doubt decrease the operating temp and improve the overall riding experience. My old 76 was noisey with the original lifters so I went to the solid lifters to get the better top-end performance. Good luck....