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Pushrods
stock 330 , gen IV , stock cam
upgrading heads to 70's vintage 049 heads stock valves / rocker arms / springs do i need to get the adjustable pushrod to measure for correct pushrods or do i stay with the stock size in the motor now i'm gonna buy new pushrods either way , just dont want to buy things i cant use |
pushrods
i rebuilt my 330hp motor a couple years ago and used manly .080 heavy wall pushrods.i am running a crane cam,hyd,flat tapplet.i think as long as you stay w/hyd cam these pushrods will work.
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mines a stock cam , is it hydrolic?
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these pushrods should be ok.with a 330 motor you could probley get by with a thinner pushrod,but i would stay w/the .080 pushrods,not that much diffrence in price.my engine tells me as long as you stay stock,do not get to wild w/milling heads,decking the block,milling the intake,you should be fine.as you know most 330hp motor,s have a cast crank,and small[peanut heads].,two bolt mains.you can probley make about 400hp with this block and be ok.hope this helps.brad
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i was mostly thinking about the length of the pushrods , not the thickness.
the peanut heads are going to be my new boat anchors , there being pitched for large oval cast iron heads , cam remains the same and exhaust is tubular headers , intake will be hi-rise single plane with a 750 holley , i'm guessing with the stock cam i should be around 380-400 hp if it doesnt grenade the first time i start it (my first build) |
Originally Posted by ENFORCER24
(Post 2446392)
i was mostly thinking about the length of the pushrods , not the thickness.
the peanut heads are going to be my new boat anchors , there being pitched for large oval cast iron heads , cam remains the same and exhaust is tubular headers , intake will be hi-rise single plane with a 750 holley , i'm guessing with the stock cam i should be around 380-400 hp if it doesnt grenade the first time i start it (my first build) 2 winters ago I put a set of 781 heads (large oval port, open chamber just like your 049s) on my 1989 330hp 454. I used the stock push rods and have had 2 trouble free seasons on them. Yes, your lifters are hydraulic. |
Originally Posted by ENFORCER24
(Post 2446392)
i was mostly thinking about the length of the pushrods , not the thickness.
the peanut heads are going to be my new boat anchors , there being pitched for large oval cast iron heads , cam remains the same and exhaust is tubular headers , intake will be hi-rise single plane with a 750 holley , i'm guessing with the stock cam i should be around 380-400 hp if it doesnt grenade the first time i start it (my first build) If you are getting new lifters, make sure you break them in properly or you will flatten a lobe on the cam and that will hand grenade a new motor. If everyhing is staying constant, then you can go back with the same length pushrods. You aren't installing roller rockers and studs. You might as well while you have it apart. Good luck with your project. I just built one almost exactly to what you are doing, but I put in a bigger cam. http://www.offshoreonlyclassifieds.c...o21326-en.html |
If you are going through all that work, you should install a new and bigger cam as well. You can get a new flat tappet cam and lifters for $200.
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Originally Posted by Griff
(Post 2446467)
If you are going through all that work, you should install a new and bigger cam as well. You can get a new flat tappet cam and lifters for $200.
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the way my brain works , i dont want to go too nuts with the cam / top end , cause i still have a cast crank , cast pistons , thin rods , and about 500 hours on em
as with all boaters i want to find the most horsepower and the least chance for missing a weekend on the water come spring |
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