You only need 112 or higher to make 500 HP, and these will be fine. Just make sure they drop to the transom, and don't flatten out. Yes, they are higher ones than "stock". without a ruler, they "look" like 3 inches in the picture

Comp cams and others actually have been doing that. Its not just for power, it helps the unbalanced air/fuel distribution that carbureted big blocks are known for. Just like firing order swaps can help even out cylinder to cylinder distribution. Not "mess up airflow in the intake" as you say.

I know your hatred for straub runs so deep, it brings you out of the shadows to comment , but can you at least slander him with some factual information that may be of help to the original poster ? Thanks.

Overlap isnt defined by "112" . its a result of timing events. In other words, duration, intake centerline, exhaust centerline, determine what the overlap will be, and when it will be. A 112LSA cam with 5* of advance built in, wont have the same overlap effect as a 112LSA cam with 2* of advance built in.

I'm aware of what cylinder swaps do. They smooth the airflow. and they are not something that should even be discussed on a 500 HP 454 build thread, just like a one off cam Both are useless in this discussion. Your comments are not helpful in this thread, as you are implying that some exotic thing will be productive in a "ON A BUDGET" thread. I could care less what straub is or isn't doing. But for the OP to listen to him on this nonsense cam is NOT going to save him money or make it a budget build. There are multiple catalog cams that will get him where he wants to be..

really? I didn't know that. OMG, I'm not giving detailed info, I'm giving a general answer on his exhaust question on reversion. There was and is no reason to get into a tech discussion on what a cam is ground at or set at or anything else. I'm trying to help the guy with basic answers to basic questions.

Nice to have new blood to the discussion. What is the safe zone for gm nodular cast crank?

550hp and ~5800rpm

550hp/5800rpm, thats enough for sure. Going to balance rods to +/- 1g both ends, pistons +/-1g. My pistons and rods aint the lightest ones. Pistons are forged speed pro l2349f. Rods are eagles I-beam with 7/16 bolts. Pistons will loose some weight because i have to shave some material from the domes, to get the compression ratio to 9.5 to 1. What is the max compression with iron heads, offcourse it depens on about the camshaft but approx? Without shaving the pistons i am at 10 to 1

Depends on the gas you have available. I ran 9.5 with 93 (and 91) octane with zero issues. Beyond that I would go on the side of caution. more CR will get you "easy" HP, within reason, but it won't help if you detonate and break stuff.

We have RON 95 E10 (10% ethanol) and RON 98 E5 (5% ethanol). Usually all marinas have Ron 98 E5