That's some great power coming from edelbrock oval port heads. Somebody evidently worked some magic with them to get those kind of numbers. Although headers and water pump only..

i would use a head gasket at least .060 thick.

I did a similar build..

Ran 82 mph in my 26 Corsa naturally aspirated...

Haven't run it in a boat with the blower yet, I bought a different boat and haven't had a chance to install this engine..

N/A dyno...


https://drive.google.com/file/d/0B8O...ew?usp=sharing




Link to my build...

http://www.offshoreonly.com/forums/g...o-results.html

Nice work. Cam specs look familiar for some reason. Btw any flaws with injectors etc or has it been pretty stable.

That forum post was a little hard to follow but either way it made decent power.

Awesome, exactly what I have been looking for.Thank you! I bet those injectors were about tapped out.

Don't know yet.. I've only put about 10 hours on it in the Corsa without the blower and decided not to continue with that hull....

Bought a Velocity 290sc, Hopefully be installing the 555 before next summer...

I noticed those IAT temperatures on your dyno sheet. Pretty cool info. I always thought the prochargers were soooooo much cooler running , and how you could run way more boost than a roots. Those IAT readings, are basically the same , if not a little hotter, than my 420 Mega Blower making 8lbs boost with a superchiller on the dyno. I love actual data, rather than "heresay" or someones "opinion'' based on sales and marketing claims.

You made that power with a 239/246 cam in full marine dress with EMI manifolds with an M4 and only 9 lbs boost, thats pretty good.. Maybe the 244/256 crane 651 would have been better. I don't know. You also dyno'ed that engine without the procharger as well didn't you?

You won't get .018 above the deck under operating conditions. The piston grows when its hot.

With a .051 gasket, and even with the piston rock at max, you'd still have .033 of clearance. Once the piston grows, the rock will be less. If you were to average the measurement, say .018 above deck when rocked cold, and say, .012 below deck when rocked the other way, you can say, the piston is .004 above the deck, and use that for your measurment. Thats how I was taught to do it, using a deck bridge and a dial indicator. So far it seems to work.

I guess my point was why buy the heads assembled and spend more making them right, that's why I said bare, the rockers I listed are not shaft mount, still a stud mount just steel over aluminum..

Scorpion stud mount .612" @ valve 700+hrs and still going. Very surprised the roller tips aren't getting flattened out because of the hydraulic rollers. But they still look new...