Question about GMPP 502ho crate engine.
06-25-2014, 11:13 AM
#11
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His boat had riser blocks...thus why I think it didn't.
06-25-2014, 04:16 PM
#13
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496HO manifolds and tubular risers workout?
I am curious as to the cam and would it fall off too early after looking at the graphs....
Maybe a single plane intake would help out?
I am curious as to the cam and would it fall off too early after looking at the graphs....
Maybe a single plane intake would help out?
06-25-2014, 04:23 PM
#14
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It shouldn't fall off too early, however, if you want more power you'll have to break out a wad more cash.
Cam, lifters (for higher lift) , Roller Rockers, ValveSprings, Pushrods.............
Cam, lifters (for higher lift) , Roller Rockers, ValveSprings, Pushrods.............
06-25-2014, 04:26 PM
#15
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How about the freeze plugs ?? Are they brass or SS ?? If not one of the 2 might want to change them.. Head gaskets will prob be ok. Run the exhaust valves a little on the loose side.. And yes might want to use a marine style carb with the looped vent..
John jr
John jr
06-25-2014, 04:31 PM
#16
Wish I had come across a deal like this when my 454 bit the dust a couple years ago. Would have saved me a LOT of money. Should run similarly to a 502 Mag. Depending on your intentions for the boat, might make a nice package. If you are worried about reversion, look for a used Mag cam in the Swap Shop. Should be pretty much a bolt-in swap.
06-26-2014, 07:38 AM
#18
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Do a search on in this section for ZZ502 modifications to marine use and/or Kidnova username search. He and I both have done the ZZ502 motor. And to your question on the intake, NO. Throw that crap in the scrap bin. Single plane--4150 based intake of your brand choice. I found the HP950 Holley worked very good. Before you guys all say that it is too big, it is NOT. That carb is really a high velocity 750-800 carb.
06-26-2014, 10:14 AM
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Changed out the oil filter bypasses as mentioned.
I'll look at single planes today. Dart? Victor jr? Something else? I'm only looking to run up to 5-5200 rpms
Spacer?
Thanks for the help so far.
I'll look at single planes today. Dart? Victor jr? Something else? I'm only looking to run up to 5-5200 rpms
Spacer?
Thanks for the help so far.
06-26-2014, 10:19 AM
#20
I like the edelbrock rpm air gaps myself. I had a 540 ci with a tunnel ram single dominator (wasn't my choice) and ran until i could not stand how much fuel it used. I put ann rpm air gap and a 950 and there was a 100rpm difference at wide open throttle
