10.5:1 comp. with holley dominator

500 ci, normally aspirated, 10.5, single 4 bbl on pump gas...... and 700 hp....


i really suggest that you guys get yourself a subscription to hot rod magazine. or go to the library and look at some back issues.

those guys are really pretty good and have put together a million combinations of big block normally aspirated motors ( and blower motors) and are generally honest and objective about the results and , more importantly , spend some time explaining the true engineering and science that goes into the decision making process during component selection...

now i know these aren't boat motors but realistically, hp is hp... and marine hp is no dif then terrestial hp... the curves and the ancillaries may differ slightly but the structure is structure and flow is flow.... physics and thermodynamics don't change when you step off your dock.

i am beginning to believe that the easter bunny may be the largest supplier of marine engines in the world.

rs:
You need to look up Linster and Excursion here on OSO. They rebdid the HP500 carbs in Excursion's 37AT and are around 565 hp now. They are running flawlessly. There are a couple posts on OSO about this build already.

StevesXM, I've been sitting back reading your posts thinking this guy has no idea that an opinion CAN be a little too over the top. You caught yourself once and made an apology, BUT, It is apparent that your ego can not be kept in check. There are a lot of people on here that DO know there stuff. So HOT ROD tells the truth huh? Well then, JUNE issue 1995, Dick Gazan built and dyno'd a 770 hp, (yes 770), 11.06 compression PUMP GAS motor. Don't assume that because you have a captive audience here that everyone is going to sit back and listen to your soapbox bullchit. I know, I know it's not 10.5 to 1, that must be why it made all that extra power..........Oh yea, it was 511 inches not 500 too.

P.S.----Check and Mate. Game over.

Mike11, thanks for the reply. However, I am still more than a little skeptical on your or anyone elses ability to be able to do enough work on the specific gm head of an HP 500 to be able to produce 700 HP with 10.5 CR and under 6000 rpms. Do you have a full dyno sheet you can post along with real world boat speeds (gps) before and after? Thanks

Mike, I'm not disputing, but how can you get that kind of power with a hydraulic roller? I thought you could only go to around .570 lift with a hydraulic roller. Does this only apply to GM hydraulic rollers?

nope... not ego and in no way suspect captive audience... but a reality check is in order periodically.... and if this guy is taking a 500 in motor at 10.5 : 1 w/ a single 4bbl on pump gas and making 700 hp.... well .... that's just amazing and nothing like that ever crossed my dyno ... ever... not in the hundreds of motors built by some incredibly clever and smart ( not to mention multiple championship winning ) guys and i did a bit of research on the web BEFORE i wrote that... figured , well been on the beach for a few years and maybe the earth spins backwards on its axis these days and i just haven't noticed.....

nope.... just about everywhere i looked, 500 in, single 4bbl motors, normally aspirated 10 to 1 more or less are all in the 575 to 600 hp range. there was the occassional ref to a 700 varient but could not find any specifics....anywhere... nor an uncorrected dyno sheet to back it up...

and it doesn't matter to me one bit if you want to believe the hype and bull**** from these guys. if it makes you feel better about yourself to have that dyno sheet in your pocket , knock yourself out. i'de rather have the real hp as opposed to the piece of paper. sounds to me like you are their kind of customer.

and no apology at all for THESE observations/ opinions

I guess you should have looked at HOT ROD, June 1995, Pg 44,46,47,48,49,and 50. 770 hp,664 ft lbs. Quote " Furthermore, the horsepower climbed steadily for a very usuable power curve that will be tire and drivetrain parts friendly in the car. Not bad at all for out of the box parts"