Help me make more power.....
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
Good infornation - can you share more information on the specific configuration (intake, headers, tuning, etc.)? At 293 HP, your results are above what would expect or have seen and would be around 12% drivetrain loss. Can you post the dyno sheet? 
The Car Craft guys that IMHO do excellent test work also found the engine pretty close to rated numbers
http://www.carcraft.com/techarticles.../the_test.html
I just haven't consistenly seen the same results in installations I've worked with, which were also based on chassis dyno runs. I'm not disagreeing with your facts (or Car Craft's) at all - my experience has just been different.
The Car Craft guys that IMHO do excellent test work also found the engine pretty close to rated numbers
http://www.carcraft.com/techarticles.../the_test.html
I just haven't consistenly seen the same results in installations I've worked with, which were also based on chassis dyno runs. I'm not disagreeing with your facts (or Car Craft's) at all - my experience has just been different.
I have the stock GM iron Vortec heads and intake, Holley 600 cfm carb, custom cold air intake with a K&N filter and lid, Dynomax full length ceramic headers, true dual exhaust with H-pipe, and Flo-Pro mufflers. I have very light springs in the shimmed HEI distributor (32 deg. total advance), very light vacuum secondaries spring, +2 squirters, and a more aggressive accelerator pump cam.
Any other questions?
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
No; thanks for posting that. Without the sheet and correction factors, it's kinda hard to know what the real numbers were - but I'll stand corrected that the output in a number of cases is closer to rated than what I've experienced with the GMPP crates. 
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
Yes, BUT my 350 HO did not perform like it does now when it came out of the crate. It produced 258 hp last year on the same dyno under about the same conditions. The HO takes some tweaking to perform like mine does.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
