Usable power for the street?

DionR said
I disagree only based on the dyno test's I've seen where a stock 5.9 with the beer barrel intake vs. one with the dual plane MP intake made the same power. And both had headers on the dyno. I think the stock cam is in the lift and duration range of a broomstick, and anything added to the motor will have a marginal impact on power.

Might make 310 or 320 with your suggestion, the RPM intake is better than the MP, but without a cam upgrade I think you are hovering around 300 hp and getting little return on the parts.

Now, swap a mild cam into it, even something as small as a [email protected] cam, and it makes a big difference. The one test I saw lost nothing down low and picked up 500 rpm and over 50 hp. Now you are making over 350 without breathing hard.

Lot's of potential, but much beyond the stock components and the cam throttles it.

My comparison on a lot of this stuff is the Chevy 300HP 350 engine. It had an iron low rise quadrajet intake, stock non HP exhaust manifolds tiny flat tappet cam and 9:1 "or so" compression. Tons of magazines and independents have done lots of dyno tests on those through the years and Chevy's advertised HP was right on the money. Drag strip times even back it up.

The 5.9 has better heads, a roller cam and more compression and longer stroke. I believe with a good intake, a 750 DP and headers, it might make 350 spinning it to 6K. It would certainly be well past the 300 mark.