I am using a set of dart sportsman II heads on a stock lower end with a decent cam 114lca 212/[email protected] and .446/.459 lift with a edelbrock dual plane and 650 holley,desk top dyno says 430 hp,I KNOW that is not right,anyone running a similar combo?
This is my band aid until I buy a new boat,hopefully gain a couple MPH.

Sounds mighty high to me, I have a 388 with a [email protected] cam, .512 lift on similiar heads, 9.7:1 and I only get 350 Horse.

I do not trust the actual #'s off desktop dyno, but I do think the torque curve shape is somewhat accurate, not the actual #s, but where it peaks and valleys.

I have done desktop dyno on alot of different engines,usually it is very close,sometimes seems way off,I say way off in this case,my mustang sbf 306 was withing 10hp and when I put in all the 260 hp specs it said 263 hp?? my buddy did his 500 horse 502 and was within 10 hp,I just cannot see over 400 hp from this combo.

I would expect somewhere between 370 and 400, for my motor. Your motor seems way high... I add 38CI and biggerr cam, I should see more HP than yours.

I know of a engine that is running the same cam and compression, but it is a 355, and he got around 360 actual dyno (corrected) His heads did not have quite the porting work done to them as mine. I do not have DTD #s for it

My buddy is building a similar engine, he DTD his combo(s) with a 3.5" crank, and a 3.875 incher. The power levels dropped dramatically with the bigger crank. That makes absolutely no sense, at least to me. This part is what discredits DTD for me. Maybe the algorithm cant handle certain levels of bore / stroke