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75 model 360 up grade to magnum heads & roller cam

Discussion in 'Projects, mods, restoration' started by OldBill, Nov 22, 2017.

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  1. OldBill

    OldBill Active Member

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    I started a 360 rebuild a couple of years ago; Bored .030 new pistons, cam bearings ect. how much trouble would it be to upgrade to magnum heads and roller cam? Would I have to go all the way to EFI too? Or is there an intake that would use a carb on the Magnum heads?
     
  2. Best Answer:
    Post #2 by dana44, Nov 23, 2017
  3. dana44

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    Moving to the roller cam is the hard part, unless it is an aftermarket roller cam instead of factory, not sure about the cam bearing sizes, but there is no provision for the lifters to be held down in the bores straight, but there is aftermarket setups. With a stock cam, you use AMC V8 lifters, they are the same size but oil differently through the pushrods (Magnum pushrods needed that feed oil to the rockers that way). There are also aftermarket intakes for carbs. The pushrods are at a slight angle, it does not alter the running of the engine, and just remembered, a stock roller cam does not work at all because the lobes on the cam are in a slightly different position on the LA and Magnum blocks, so aftermarket roller cam would be needed.
     
  4. AC TC

    AC TC Well-Known Member

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    If youré going mopar efi start with a complete magnum.
    - while it has been done and is done mounting magnum heads on la blocks and the wise versa its probably more efficient to use an aftermarket LA head.
    The magnum head is the "best " sb mopar head that came from the factory but its far from a really "good" head.
     
  5. dana44

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    Yes, the Magnum heads are a nice bump in compression for starters, so the heads, AMC V8 lifters and Magnum pushrods, valve covers, and I believe the exhaust manifolds and intake manifold (redrilling the stock manifold isn't a good idea, weakens the mounting points), make up the conversion. Also, pushrod holes have to be opened so they don't rub.
     
  6. OldBill

    OldBill Active Member

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    So the heads are a bolt on except for expanding the pushrod holes? You wouldn't happen to know how much expansion of the holes is enough? Are all the magnum motors equipped with the hydraulic roller cam? What makes the AMC lifters necessary? Are there (aftermarket) manifolds for the magnum heads for carburators> I have lots of carbs and really don't want to Try EFI.
     
  7. dana44

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    You can do a search as far as the specifics on the swap goes, but basically the offset from the lifter bores between the two engines and the Magnum pushrod holes has to be corrected, not specific on the size hole that needs to be drilled, articles do say what size works. The AMC lifters are needed because they fit the lifter bores and oil through the pushrod to the rockers, LA engines oil through a common rail from the oil gallery through a hole in the head to the common rocker arm rail, the AMC V8 lifters fix this oiling problem, they oil through the lifter through the pushrod to the rocker arm. All Magnum engines are roller cam engines, check out the "engines" section for some history (318/360 and 5.2/5.9 sections in the Allpar categories, very informative information). There are plenty of aftermarket Magnum to carb intake manifolds out there, you would want something in the dual plane category. Like I said, Mopar Action, Mopar Muscle, Mopar Performance, Hotrod Magazine, all had the article to convert, should be easy to find online.
     

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