500hp Gurus !!!
06-06-2007, 03:35 PM
#21
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Wow, I am suprised by the MSD. I always thougt that the merc ignition was pretty damn good. Interesting though.
06-06-2007, 10:02 PM
#22
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You need to compare the Propshaft horsepower..ie, 502mag = 415psh & the HP500 = 470psh add 30hp to get the crankshaft horsepower for each engine..FYI, the 525sc is a blown 454 that made 490 psh... the HP600sc is blown 502 and made 550 psh..the 800sc is a blown 572 and made 700psh..the 1000 sc was a blown 542 with high compression 9:1 ! and made 950psh !!! yikes..all the other blown mercury engines had 7.5:1 compression....also, the 525sc had a single 1050 carb..the 600 & 800 both had dual 700 holleys & the 1000sc had twin 1050's! they all had 4800-5200 RPM range accept the 1000sc it just had "run me @ 6200rpm" stamped on it!
06-07-2007, 04:12 PM
#23
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Well there are a couple of things...(A) your motor is not a true '2002' HP500 because Merc stopped building carbed HP500's in 99'. (B) If it has a 02' serial number, then someone has already scrapped the fuel injection. It would be helpful to know which motor you have because they had a cam for the carbed and a cam for the EFI which are quite different. Non the less, since you are already cabed you have a lot more options..some of which have already been mentioned....
But the huge hang-up with the regular EFI stuff is the very restrictive intake manifold and from what I have been told its very hard to make them flow enough to support better heads, etc...can the intake be modded...sure...but its only money....
But the huge hang-up with the regular EFI stuff is the very restrictive intake manifold and from what I have been told its very hard to make them flow enough to support better heads, etc...can the intake be modded...sure...but its only money....
06-08-2007, 01:49 PM
#24
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The motors were bought in 2002 but were carbed so they must have been left overs from 99 i guess. It looks like the heads and the cam are the way i will go, what heads should i go with or is it cheaper to just port the stockers. Also what cam will i need to go with. Thanks for all the info guys.
Last edited by speediseverything; 06-08-2007 at 01:52 PM.
06-08-2007, 01:56 PM
#25
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probably similar price if you just buy soem good aluminum heads and blot them on rather than remove disassemble, port, ressemble and install the stockers.
Just my 2 cents.
Just my 2 cents.
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06-08-2007, 02:14 PM
#27
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If 550HP is your goal the stock heads should be fine with some bowl porting and a valve job.
For 600HP, it may be more cost effective to buy new heads.
RMBuilder is man to select a cam to maximize the power of your combo.
For 600HP, it may be more cost effective to buy new heads.
RMBuilder is man to select a cam to maximize the power of your combo.
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