70MC402 Posted July 13, 2023 Share Posted July 13, 2023 (edited) Hi everyone, in early August I’m going to be bringing my 505 to the Dyno to see how it does. Any guesses at power and torque numbers? Let’s see who can get the closest! The Dyno altitude is roughly 930 feet above sea level. In August my guess is it’ll be 70s-80s when we run it. I’ll be running it on 93. The engine is 505 cubic inches. 4.350 bore, 4.250 stroke. Two bolt main block, ARP main studs. Align honed, decked, bored and honed, cam bearings, magged. It’s a Molnar 8 counterweight crank, molnar H beam rods and Icon 1/16-1/16-3/16 12cc dome pistons. The heads are 049 castings with the intake ported by Mark Jones of Vortec Pro. I can’t say enough about how helpful, educational, and thorough Mark Jones has been through the whole process with all my questions. The heads had 2.190/1.88 valves installed before I got them, and measured between 118-120ccs, yielding roughly 9.8:1 compression.They currently have comp cams 924-16 springs set up at 1.800 installed height. 147 lbs on the seat and 343 on the nose. The cam is a billet core version of the comp 11-456-8. 242/248 at .050 and .566/.566 lift, 112 LSA, installed ICL at 108. Using a set of lifters I ordered from Crower, they are the high pressure pin oilers, and when unboxing them I found they’re actually Johnson’s! Still pin oiled lifters. 7/16ths Manton pushrods. Crower enduro stainless 1.7 rockers. The intake manifold is an out of the box RPM air gap. The carburetor is an FST 1050 built by Mark Whitener at Lighting Racing Carbs, another guy I can’t speaking highly enough about. Ignition is a MSD pro billet, 8.5mm MSD super conductors and NGK 4323 plugs. If there’s anything else I missed don’t be afraid to mention it! Thanks and let’s see who’s closest! Edited July 13, 2023 by 70MC402 Quote Link to comment Share on other sites More sharing options...
Jason72 Posted July 13, 2023 Share Posted July 13, 2023 625 hp. Quote Link to comment Share on other sites More sharing options...
1Bad454 Posted July 15, 2023 Share Posted July 15, 2023 My 467 built by Mark Jones dyno'd at 605/605. My guess is 650. 1 Quote Link to comment Share on other sites More sharing options...
Glen Posted July 15, 2023 Share Posted July 15, 2023 617 / 604 Let me know what I won when I win. Quote Link to comment Share on other sites More sharing options...
Glen Posted July 15, 2023 Share Posted July 15, 2023 Oops. Fat, fast fingers… 617 hp / 624 tq Quote Link to comment Share on other sites More sharing options...
714024SPEED Posted July 15, 2023 Share Posted July 15, 2023 I'm going to use the old school math Cubic inches+cam size+carb = never enough HP lol just kidding. Sounds like a great combo 2 Quote Link to comment Share on other sites More sharing options...
Dragginwagon467 Posted July 23, 2023 Share Posted July 23, 2023 On 7/13/2023 at 2:52 AM, 70MC402 said: Hi everyone, in early August I’m going to be bringing my 505 to the Dyno to see how it does. Any guesses at power and torque numbers? Let’s see who can get the closest! The Dyno altitude is roughly 930 feet above sea level. In August my guess is it’ll be 70s-80s when we run it. I’ll be running it on 93. The engine is 505 cubic inches. 4.350 bore, 4.250 stroke. Two bolt main block, ARP main studs. Align honed, decked, bored and honed, cam bearings, magged. It’s a Molnar 8 counterweight crank, molnar H beam rods and Icon 1/16-1/16-3/16 12cc dome pistons. The heads are 049 castings with the intake ported by Mark Jones of Vortec Pro. I can’t say enough about how helpful, educational, and thorough Mark Jones has been through the whole process with all my questions. The heads had 2.190/1.88 valves installed before I got them, and measured between 118-120ccs, yielding roughly 9.8:1 compression.They currently have comp cams 924-16 springs set up at 1.800 installed height. 147 lbs on the seat and 343 on the nose. The cam is a billet core version of the comp 11-456-8. 242/248 at .050 and .566/.566 lift, 112 LSA, installed ICL at 108. Using a set of lifters I ordered from Crower, they are the high pressure pin oilers, and when unboxing them I found they’re actually Johnson’s! Still pin oiled lifters. 7/16ths Manton pushrods. Crower enduro stainless 1.7 rockers. The intake manifold is an out of the box RPM air gap. The carburetor is an FST 1050 built by Mark Whitener at Lighting Racing Carbs, another guy I can’t speaking highly enough about. Ignition is a MSD pro billet, 8.5mm MSD super conductors and NGK 4323 plugs. If there’s anything else I missed don’t be afraid to mention it! Thanks and let’s see who’s closest! I also run a Mark Jones engine...510 CI, 4.310" x 4.375" Your head flow at 0.200" lift looks exceptional on the bad ports - these are typically in the 155-165 CFM range, good ports 175-180. Compression is a little lower than his standard builds (-18cc) and the cam isn't one I've seen him use (generally Isky or Bullet). That being said, the cam lift (which ultimately determines how much airflow the engine sees) is about the same as the Isky 228/238 (0.553"/0.578"), while the duration is a little longer (I would think the torque would be a little lower down low and peak about 4500 and the horsepower should peak about 6200 rpm (which is good carry for 505 cubes and 049 heads). My guess, STP corrected 655 hp @ 6200 rpm and 675 ft-lbs @ 4500 rpm. Good luck, another thread to look forward to on the FGMCC site! Quote Link to comment Share on other sites More sharing options...
70MC402 Posted July 23, 2023 Author Share Posted July 23, 2023 11 hours ago, Dragginwagon467 said: I also run a Mark Jones engine...510 CI, 4.310" x 4.375" Your head flow at 0.200" lift looks exceptional on the bad ports - these are typically in the 155-165 CFM range, good ports 175-180. Compression is a little lower than his standard builds (-18cc) and the cam isn't one I've seen him use (generally Isky or Bullet). That being said, the cam lift (which ultimately determines how much airflow the engine sees) is about the same as the Isky 228/238 (0.553"/0.578"), while the duration is a little longer (I would think the torque would be a little lower down low and peak about 4500 and the horsepower should peak about 6200 rpm (which is good carry for 505 cubes and 049 heads). My guess, STP corrected 655 hp @ 6200 rpm and 675 ft-lbs @ 4500 rpm. Good luck, another thread to look forward to on the FGMCC site! The engine isn’t one that Mark put together, it’s one that me and some friends built. Mark did the cylinder head porting and has given helpful advice numerous times along the way. If I was going to do it again I’d take some of that advice and use a Mahle piston vs the Icon, I’d either pick a cam a little closer to the .600 lift range or I’d use 1.8 rockers on atleast the intake. Once all the porting/shipping costs and the setup for the valve springs (stupid spring pockets are 1.500 and should be larger like 1.550-1.575 for a larger spring) I’d likely go with a set of AFR 290s next time for just a couple hundred more. But for what this is I think it should do pretty well! Quote Link to comment Share on other sites More sharing options...
70MC402 Posted August 8, 2023 Author Share Posted August 8, 2023 Well it didn’t quite make what I was hoping but it should still be a handful! After an afternoon of jet changing, spacers, timing adjustments best we could coax was 577 torque and 582 horsepower. Quote Link to comment Share on other sites More sharing options...
Dragginwagon467 Posted August 8, 2023 Share Posted August 8, 2023 3 hours ago, 70MC402 said: Well it didn’t quite make what I was hoping but it should still be a handful! After an afternoon of jet changing, spacers, timing adjustments best we could coax was 577 torque and 582 horsepower. That’s not too bad. The power hangs on fairly well up top and that torque curve is nice and flat. Quote Link to comment Share on other sites More sharing options...
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