Recent content by mdgperf

If you can't get it straight i will be glad to look at it for you,located in edgewater,md 30-40 minutes from you,I have a ASNU fuel injector cleaner and flow tester and have found a lot of strange problems with the 454/502 efi injectors most of them were made by weber,give me a call if you need...

I have two seats out of my zrc when it was a race boat have slots in them for race harness,will take some pics if still looking,dave 443-223-6876

If you are running a 502mpi and don't plan on upgrading to big hp(over600) you could rig with a std bravo and gimbal,most of the boats i have converted have picked up 3-5mph,the downside is a lot of labor glassing in transom and moving engine and re-rigging,sometimes when you cut into transom...

I don't think anyone makes a bolt on kit for the 575,you will have to buy a heat exchanger and some brackets and modify as needed,ther is also heat exchangers that can be remotely mounted if you have some extra space in bilge,I am installing a fwc kit on one of my 572-700hp engines as we...

I always use new gaskets not worth the risks,the fel-pro mls are real nice and have nice sticky surface that seal up the water ports real nice in a marine engine,We use to use the felpro loc-wire in blower application but we feel that the mls style gaskets work better ,head and deck should be...

I have owned a land & sea dyno since around 1996,dual rotor i set it up for what i work on the most 500-800hp marine engines,I set it up to use water cooled exhaust and all the marine hardware so its true marine hp ratings,the brake holds well on sweep and steady state pulls,I pull my water...

The 575 boat around 90 on good day,the 525 around 84 on good day.I have one of each of these boats at my marina and have run them several times,of course some other boats will be a little different,Both engines are great motors but if i were buying a 575 boat it would be alot better if run in...

Lingefelter design that intake for merc back around 1992-1993,he use to also make a 540 kit that was a modified intake,ported,shorten runners,camshaft,and re-program ecm,he was one of the few that could reprogram the mefi back then.A lot of those intakes were removed back then and were replaced...

Great news,Wish you a quick recovery

Adding the intercooler will add power if you up the boost,I did some dyno testing on a 454 bm 250 blower set-up,adding the intercooler showed very little increase but allowed me to run 7lb boost instead of 5lb on pump fuel,thus the 50-75hp increase

I tried a set of them a year ago(traded someone for some parts)got the bare castings,needed bowl blending and valve job way too narrow for me,installed manley valves machined the seats,installed them on a 502,world intake,sm exhaust,hr camshaft made around 530hp,did the same engine using afr...

Ted you can easily make the 550hp with the mefi1 and your injectors,but as everyone that has worked with that old intake knows,the thing is junk!for making power,I once dyno a stock 502mpi made a little over 400,changed it over to intake and carb made 450,If i were you i would consider buying a...

Thanks guys glad to be here on a great new site with real hp boaters,been in the hp boat business for over 20 years and have enjoyed every minute of it,really look foward to do what i can to help you guys with your hp projects,I plan on posting pics on some cool new projects going on at MDG...

Pretty much the same engine except 7.5 compression,compared to 8.6,same cam,crank,rods,block engines held up real well,they would wipe a cam lobe once in a while(as would all flat tappet cams back then)the 454 like supercharging non siamese block has good cooling around cyclinders,use to run a...

The merc 525sc a great motor that can go some hrs,454 low compression,low boost,I would recommend a complete overhaul and upgrade the cam to a hydraulic roller thats if the motor was run in fresh water,if the engine was run in heavy salt probably better off running it till she blows,i would also...