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Thread: Ecotec Head differences

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    Ecotec Head differences

    This would be for a microsquirted engine, in a racetruck application:

    I've read a lot about swapping heads on different blocks, mainly the l61 head for the j-bodies. But which of the heads has the best ports/cams/valvetrain??

    Are all ecotec heads the same combustion chamber CC?

    Which heads respond best to porting?

    Is it only minor differences at the intake flange like pcv that stop intake swaping??

    I'm aware of the 2.0 lsj head, 2.2 l61 head, and the vvt 2.4 head.

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    they all technically bolt up, and that is where my knowledge ends haha.

    but in all seriousness the LSJ i think flows better, and of course it has the sodium exhaust valves and i think stronger valve springs, but the 2.4 has the VVT. My guess would be that a ported LSJ head would be your best bet.

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    Which block are you using now?

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    I don't have any. This is still in the planning stages, and we'll probably run a close to stock engine untill all the bugs are figured out on the truck, since it would be new as well, until we do one of these engines up.

    Rules are 1 lb per engine cc, 2.0 crank will be used, but beyond that, block and heads are going to be what we figure are best. No forced ind/N2O.
    Plan is to run high compression, since no fuel rules are in place, and run methanol.

    Getting the best flowing head to start off with would be great, since the a/f of the methanol will offset the head flow numbers slightly due to the volume of fuel being injected.

    Goals are around 14+ compression if possible, hence my question on head cc's, and a power up to around 8500, with a redline around 8700.

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    If the 2.0 is the best way to go, what is the most head flow that has been achieved out of these heads, and is the chamber the same 53cc as the 2.2?
    It looks like we'll be going with the 2.0 for our main engine.

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    Have you seen the flowsheets for the GM Race Head or Patriot head? I'm not sure exactly what would be necessary to make them work on a 2.0 block (maybe not much, but that info is on here somewhere), but the numbers would give you an indication.

    Nothing is difficult; some things just take more time.
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    Well i found flow charts for a cnc'd lsj head at m2race, and the patriot cnc'd 2.2 head.

    LSJ head seems to be a far better way to start, since even unported it flowed 260 cfm.

    Has anyone welded in these heads to get a cloverleaf chamber that allows squish/higher compression?

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