Is it possible to build a 502 with 9.0 compression ratio so it would run on 89 octane and make 600 HP ?????
Whats the best parts to use........
heads ???????
cam ?????
Carb ????
Intake ????
Ignition ?......

I believe with Aluminum heads you can run a higher comp ratio. I'm not a engine builder but I know a guy...Lol

I did a 500 EFI with AFRs, 9.5 JEs .030 over,Bob Madara Cam & lifters, etc. Jason Saris did the final assembly, dynoed and programed it to run on 89 octane. Made 572 HP @ 5400, 606 tq @ 4500.

I have two 509's with Dart Pro 1 alum heads that runs fine on 89 octane with 10.0 to 1 comp ratio. I do have the pistons zero decked for good quench. I am running the 741 hyd roller cam, Lightning headers and they produce 650 HP.

I ran 89 octane. Dart Pro1 heads 9.7:1 454's 590HP 6500RPM's. Now 87 octane @ 9.0:1.
Locked timing 35*, Crane HI-6M.

Yes.

Man you are funny tonite ^^^^

Its like motor and gear oil you will get so many opinions & replies about different apps and builds.. just saying

For any motor that isnt High Compression the Quench being right is Very important. Get it wrong and you got a Pig with a bunch of good parts..Get it right and you'll be smiling.. Read Up !!!!

515ci 8.7:1 compression
587hp @ 5700rpm
586lb-ft @ 5000rpm

I just ran yesterday. 509, 9-1, ported heads and intakes, Marine Kinetics cams, 235/239 640/655. DaVinci carbs. Made 597hp at 5700.