Interesting... I noticed the 565 is relatively low compression at 8.7:1

Same cam the 525EFI uses. They use it in the 525, 520, 540, and 565 engines.

Must be the modern day equivalent of the 3/4 race cam!

LMAO, Nice!

Seems like the 565 would benefit from more duration given the longer stroke.

Have been on the fence about a 4.25" stroke or 4" for the new short blocks in the formula. Look at this article hot rod did using a lunati 231/239 hyd roller.

540 Big Block Chevy Engine - Godzilla Rat - Hot Rod Network

I wasn't sure if I could use my current 230/236 .598/.610 with this combo and achieve the power I desired. They used a similar SRP piston to what I was originally thinking... somewhere in the 10:1 neighborhood. I really don't need to spin the engines faster than 5200-5400 and it looks like they made power all the way to almost 6k with such a mild cam. Thoughts are appreciated.

The outfit I bought my shortbloicks from stated their 540 marine engine with dart pro 1 heads, 9:1 compression ,roller 237-243 duration at .050 lift and about .640 open put out 620 hp. That's what I'm using in my 572's . My heads are mildy ported and about 9.2 comp. If your running 10:1 compressing you can use longer duration. Comp cams makes an extreme energy 242-248 duration roller cam. You might be able to go a little longer. Those old flat tappet cam specs i posted earlier in thread fir bulldogs supposedly put out 500hp with 8.6 comp. And 088 gm unported heads. Some people say when they dynoed those engines they were putting out 540hp. I imagine with good heads 10:1 comp your going to hit 650 or more hp

kind of funny they refer to the 540 as a Godzilla rat..........I wonder what they would call a 903 Musi.........

Musigeddon

I know after I got the 572 short blocks, i kckes myself in the ass because i could have gotten even taller blocks. For a little more money