Reply to "My Timing"

PD,

Amazingly close actually. I made the following dyno sheet when we were building the engine 6 monhs ago. Peak hp was just below 500. I could not break 500. Tq was a little over 520. This graph actually shows the same engine, same cam except one is the 434 (actualy 427 with no overbore) and the dotted line shows the same in a 351 configuration. Shows the difference in cubes everything else the same.

http://www.rc-tech.net/cars/panttransam/1905/351v400.jpg

This is the actual dyno run:

http://www.rc-tech.net/cars/panttransam/1905/dyno2.jpg

He has one run not in there he made 494 hp. The first graph lookes more arched but it is how it is spread out. If you plot them they are very very close. Bigest difference is the actuall engine made more torque down low. It come out of the gate at 2K rpm at more then 420lbs tq.

One thing that may be a little different though is the head flow. I used CHI head flow for the DD (desktop Dyno). The 3v heads flowed less at lower lift then the 2v but there was more material around the exhaust valves CHI did not remove so the builder worked on that. I wish he had re-flowed the heads but that could be adding a little tq in the lower rpm band and maybe even across the board. No way to know without comparing both though.

Either way HP was within 5 and tq was within 15.

Gary