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Originally Posted by prostock85
(Post 2759940)
Are they for trs or bravo?
Also, how many horse are the HP500's? Are they actually 500, or is that measurement at the prop? sorry for the ignorance With CMI's on them, they wre virtually indestructible unless you just totally abused and mistreated them. |
thanks jeff, I thought the little tag that was on the valve covers said they were 500 horse (I figured it was exaggerated).
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Originally Posted by prostock85
(Post 2759951)
thanks jeff, I thought the little tag that was on the valve covers said they were 500 horse (I figured it was exaggerated).
I don't know why they say that? One of our more historical guru's out here might be a better source. Maybe they were just marketed as 500. From what I understand the current 525 has a pretty broad band. If you took a random sampling, I have heard you will get nywhere from 500-585 on a dyno. This might be the dyno also. If you hve them, just use them. They are good engines. |
Originally Posted by jeff1000man
(Post 2759957)
Did they say 500HP or HP500.
I don't know why they say that? One of our more historical guru's out here might be a better source. Maybe they were just marketed as 500. From what I understand the current 525 has a pretty broad band. If you took a random sampling, I have heard you will get nywhere from 500-585 on a dyno. This might be the dyno also. If you hve them, just use them. They are good engines. I heard the same for the 525's, and that they were rated that at the prop.... but what drive..etc... I don't have them, but I'm trying to weigh the price difference vs. performance between the 420's and 500's since hey should both drop into my hull. |
New Mercury Racing HP450 & HP 420
Price: $5000 Check these out in the classifides, new adds Jeff, those are NICE. Wish I had the extra cash. Any new pics? |
Originally Posted by prostock85
(Post 2759967)
They actually said 500 h.p., most likely under ideal conditions
I heard the same for the 525's, and that they were rated that at the prop.... but what drive..etc... I don't have them, but I'm trying to weigh the price difference vs. performance between the 420's and 500's since hey should both drop into my hull. 420's can only be stroked to 496's. 502's can be stroked to 540, and then you have something. You can also buy my 496's at the right price also. I hate to let them go because of all the time I have in them, but I just on't see a boat in their immediate future. |
Originally Posted by P Offshore
(Post 2757719)
I have a set I would sell cheap.
Pm me if anyone is interested. |
Originally Posted by Cold Sweat
(Post 2758398)
Price for 2 sets, any tails ? I'm having my 420's rebuilt, have stock merc manifolds. Those pre gil/mercruiser exhaust are a joke, if any one is still running these, change the rubber gaskets and remove the stainless tails, make sure the water passages are clear of scale. Mine were nearly blocked at the riser and tail flange. I guess the first owner did very little maintenance to the manifold gaskets, and I'm sure it was the cause of both engine failures. I decided to keep the 420's because of their reputation, but will upgrade to roller cams.
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Originally Posted by prostock85
(Post 2759940)
Are they for trs or bravo?
Also, how many horse are the HP500's? Are they actually 500, or is that measurement at the prop? sorry for the ignorance |
My original 420 exhaust (not gil's) leaked so i went with the imco's for trs application. I am really happy so far with two seasons on them
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