Motor is stock minus: 1 3/4" SLP headers Smog pump delete T-56 conversion, aluminum driveshaft I was impressed... what do you guys think? Looks like the image got shrunk: # are: 246 / 347

Well, IDK dyno stuff other than what the magazines show, but I give ya for having nuts to dyno a 200,000 mile motor!!

Those are damn good numbers for a 50,000 mile L98... 200,000 = wow

Encourages me to go dyno my 210,000 L98. I still get 18mpg/ 21mpg (brand new rating was 22mpg highway, i think), 225hp/330ft lbs, it still starts on the first revolution of the crankshaft, uses NO oil and can roast my 315s......Maybe I should go after all!

Thank you for posting some dyno numbers on a close to stock L98. Do you have an upgraded exhaust or just headers?

Stock is supposed to be 245hp. I think that number is crank hp and not from a dyno? Your dyno shows us what headers alone can do for better engine performance. Figure 18% power loss on manual transmission and you have 290hp at crank. Seems like a larger than expected boost from just headers.

This summer I want to dyno my L98 with major air lid mods, FIRST intake and dual exhaust. I have stock headers so curious what numbers will be.

wow pretty impressive numbers, what kind of dyno was it on?

That's pretty sweet for a 200,000 mile engine. Keep taking care of it & you can do alot with her!

Healthy!