Project kept on growing, I wanted every surface machined and cleaned up, and made perfect, and to do the best job, I had to go 522, that was the only way to make everything sweet. The problem is, that I had to have custom pistons made with a specialized displacement, which took more then a month to show up, since it was race season. Which led to my project taking longer and of course adding a chunk of change. But in the long run, everything assembled went smoothly, because all of the surfaces were machined perfectly. My Engine assembler has access to a huge machine shop and has 35+ years experience with the tools! Everything had to be balanced. In the end the price tag was large, but i know that every part was new, or machined to new specs

Were you shooting for a specific cr? Is that why you had to go custom on pistons? I'm looking at the srp line of JE pistons in 4.560" bore. Also leaning towards new scat cranks and rods. I'm not reusing any of my current short blocks.

Yes, PM sent.

After throwing around the stroke issue I'm currently going with a 550 standard deck.a hydralic roller cam 10.2 to one compression and fuel injection.

I didn't want to go with the longer stroke and tall deck for stroke and alignment of my exhaust etc.

should put out over 700hp and high 600 torque.

torque will be over 600 up to 6000.

i misquoted when i said it was a crane 168741 cam,it is a 525 efi cam. everything is the same as the 168741 except the lsa,the 741 is on a 112 and the 525 cam is on a 114 lsa. although it made good power today it did not make the 625 i was expecting,it peaked at 602 hp and 598 lbs of torque.peak hp was at 5900 rpm,the next one of these i build will get a little more lift&duration on the cam because this one ran out of gas at 5900 rpm.i will add that i was very happy with the performance from the engine quest heads.

What carb and intake Mike ?

new gen3 holley 1050 2 circut dominator and edelbrock dominator single plane intake,i don,t remember the part number.

https://www.offshoreonly.com/forums/...weekend-7.html

Photos and Videos on the last page of the thread above is how the engines are dressed out now. I know I will need more carb it currently has 800 quick fuels. Should I plan on going to a dominator style? I have room for a small spacer if needed. Thanks Mike!

tyler,i went with the dominator&manifold because everything was new,no existing parts from another build.if you already have a 4150 manifold and are on a budget imo that would work pretty well with a 1050 4150 carb.

Just caught this thread. I have a 524 similar to what you are looking to build. It's a 4.565 bore with a 4" stroke, 6.385 Eagle H-beam rods, AFR 305 Rectangular heads with CNC chambers and bowls, Brodix HV2000 intake that has been ported with the heads. Custom Holley 950 cfm 4150, custom hydraulic roller cam with .611/.623 lift 242/252 @.050, 10.1:1 compression, Crower stainless rockers with a stud girdle. MSD 6M ignition and Lightning wet headers. It sounds awesome, a little too, I had to put Gibson mufflers on it to keep from getting tickets. First time I started it after the rebuild in the marina, it sounded like thunder. I never had it dyno'd but it runs better than it sounds. I've had my boat to 90 with 4 people and a full tank of gas, I can only go half throttle getting on plane or the prop blows out. Acceleration from 45 is absolutely amazing. Big bore short stroke engines are very efficient and love to rev quickly.