Rebuild time on HP500's?
 

After how many hours is it recommended that you rebuild HP500's?

Thanks,

M

Re: Rebuild time on HP500's?
 

Depends on whos on the sticks. :D 300 hrs is a good time to freshen.If Budweiser played a roll in throttling then less :drink:

Re: Rebuild time on HP500's?
 

I still think 300 is the magic number, new rings, springs, gaskets, bearings & lifters. The 500 Carb's seem to be able to make it to 500 hours but I dont like to push things. It dont have as agressive as a cam as a 500EFI

Re: Rebuild time on HP500's?
 

A friend of mine had 330 hrs on his. They put in valve springs and she was good to go. Ran all of last season as strong as ever.

Re: Rebuild time on HP500's?
 

It is very common on HP 500's to have broken valve springs at 200-250 hrs.

Mike




Roccard Marine Engines
www.roccardmarineengines.com
[email protected]
570-956-2840

Re: Rebuild time on HP500's?
 

I would agree 300-350 is a good number of hours for freshen. Of course everything has to do with like JC said how hard your are on them. And how good is your maintenance program. :D

Dean Gellner

Re: Rebuild time on HP500's?
 

Do a leak down test to check the health of the engine. A general rule for average use would be top end refresh at 200-250hrs and full rebuild at 400-500hrs.

Re: Rebuild time on HP500's?
 

I replaced my valve springs at around 370 hours already had a inner spring broken, no damage though. I am around 450hours now and don't plan on replacing my lifters until 550-600 hours. Very little time running WOT. I was told by multiple builders that these motors babied could get 1000 hours before a full rebuild?? Oh well :D I had the leak down test done at 370hours and the mech said it was still with in tolerences of a new motor? what ever that meant

WILL

Re: Rebuild time on HP500's?
 

Mine made it to 400 hours, with new springs @ 200.

Then, lost a valve seat in one cylinder. But that was the result of leaking headers. Unfortunately, both motors had leaking headers, so both needed complete rebuilds.

If it weren't for the headers, I think the motors had many more hours in them.

Re: Rebuild time on HP500's?
 

Mine are at 350. Im having the top ends rebuilt. Ive heard the bottom end is good for awhile.