I wanted to post the dyno sheet here but I cannot resize it for some reason, it won't upload? Anyway-thx for the info I appreciate the feedback.

Brent,Ill be calling you as I may be rebuilding my boat engines this winter, let me know if that is something you could help me with, I am looking to get a bit more power out of the 350's.

Thx again.

Attachment 21114

Heres the dyno sheet

I don't really specialize in Chevys but I can do them. I just built a 408 LS2 road race motor that went out a few weeks ago, and I have a 427 BBC out of a '68 Vette on a stand. Just don't tell anyone. :)

As for the dyno, I agree with Chas....it would be interesting to see what a different dyno would say, but it's really a moot point.

The dyno I use is known to be conservative....it's been up to 100 hp lower than the other 2 dynos within an hour's drive. I really don't know how to view that. In one way, it's good to have an engine that's pulls 575hp and "outruns" the 600hp engines.....but in another way, horsepower numbers sell engines and although I don't get a lot of "So-and-so's engine shows a 600hp dyno sheet but your engine put out 575, what's up?" questions, but I can't help to think that it gets thought about.

I just dyno'd a 427 last week. It used TFS High Port heads, a tad less than 10.5:1 compression, and a 240/244 degree cam with about .620" lift. The heads were ported (not hogged out, but improved upon), the intake was ported, etc. I think as a tribute to how well the heads performed, it peaked at 6500hp, but was slightly less in duration than your cam and I think around the same lift. A solid performer of a combination (hipo street, not technically a race engine), and it made 574hp and about 560 lb-ft of torque.

What's interesting is that your engine peaked much lower, but had more torque and around the same horsepower, which is usually indicative of a smaller camshaft, which focuses on torque and a lower rpm peak rather than horsepower. Again, the difference between a "conservative" dyno and a "liberal" dyno.

The bottom line is that the engine runs well, doesn't smoke, doesn't have low oil pressure, isn't eating itself alive, etc. Trying to discern 15-25 hp in a 2500 lb street car is not an easy task.

Thx Brent, it amazes me a bit-since to my mind sees a Dyno as a measuring device, )after all we measuring forces basically) that there is so much disparity. I get it though, since it is not a regulated industry-after all we could calibrate gas pumps to only dispense 3/4 of a gal of gas if there were no "weighs & means" regulations and enforcement as such.

As always thx for the input.

Weights & Measures