David Freiburger's Quest for 1,000HP NA with Dart 582 BBC

david freiburger Here I am on the quest for a thousand horsepower naturally aspirated I'm gonna do it with a 582 cubic inch big block Chevy and I want to tell you about my Dart tall deck aluminum block because I am in love with it this is my first aluminum big block and it makes me super super happy it does have that 10200 deck height the stock big-block Chevy is nine 800 and the reason that I did that is so that I've got some expansion for the future and also so that I can use this particular combination of components which is a k1 technologies six point seven inch connecting rod and a custom diamund piston that has a 1.30 three inch compression height getting back into this engine block there's a few other things that it's got that are not your normal Street stuff first of all it has lifter bores that are bushed for 0.90 for diameter roller lifter which is larger than your typical big-block Chevy it's actually a Chrysler Hemi or wedge size and by using that larger diameter lifter you get a larger diameter roller and therefore you use a camshaft that has a different low profile that can be more aggressive now the other thing is this block has been board for a 55 millimeter camp or again larger than your typical big-block Chevy the reason for that is when you're building this kind of giant camshaft in this kind of rpm you've got a lot of valve spring pressure the camshaft can actually flex by running a larger core you get a more rigid camshaft and it leads to better reliability and performance and so dart was able to supply this thing board for that 55 millimeter cam but importantly I didn't want roller cam bearings which is super common in a build like this this actually has Babbitt bearings in it it's gonna be a little bit more streetable personally I fear needle bearings inside my engine that's a big reason why I did that so another thing that was really important about going with the dart engine block is that I was able to get it prepped fully machined straight from dart ready to assemble this makes the whole process way easier because they knew what piston I was gonna run what my ring package was they're able to bore and hone this thing perfectly for my con nation it's already completely dialed in between the hoenn job it's also got deburring it's a line honed it's got clearance for the stroke it's ready to assemble and that was a huge factor for me on that thing now the real key to the horsepower that I'm looking for is this cylinder head I'm never gonna make it to a thousand easily with a conventional 24 degree head see a big-block Chevy stock is 25 degrees on the intake valve and then aftermarket typically is 24 this is a 20 degree intake valve angle therefore flattening out that intake valve for more flow and it's gonna be the key to just bumping me over that thousand horsepower number now this cylinder head is part of the race series it's there for 51 CC intake runner and it's got 160 on the exhaust it's really a crossover between the more basic 24 degree heads that you can get from Dart like the pro one and the Big Chief stuff or the spread port stuff the advantage to this is it's still a race cylinder head it's got significantly higher performance than the 24 degree but I can still use a regular cast aluminum intake designed for a regular old big-block Chevy in this case for a tall deck and so that intake face surface is the key to keeping cost down and making this simpler and honestly to making the engine just look like a regular old big-block Chevy I told dart exactly what I was trying to do here and they set me up with titanium intake valves because the intake valve is a 2.4 inch diameter that is a big Hanken valve and when it's in stainless steel it's so heavy that we might see some difficulties with valve controlled getting it past that 7,500 rpm point so that we can run the thing past its power peak on shift recovery on the exhaust side it's a 1.8 inch valve and we ordered up custom inconel typically you would do that for a boosted application or four big nitrous and it's one of those things where they just know that I'm probably going to do that in the future and so they set me up with inconel really importantly on this cylinder head it's got 97 CC combustion chambers a typical big-block Chevy whether it's aftermarket or oay with an open chamber is gonna be 118 to 121 CC the problem with that is when you go to make a piston and you're trying to get 14 and a half to 14 point 7 to 1 compression which was my goal you end up with a giant dome to match a giant chamber in this case the small 97 CC chamber means that I told Diamond Pistons what I was doing and they were able to custom shape a dome at only 23 cc's it's nice and flat it creates better flame travel across the piston than the big old dome that you would typically need so that's a huge advantage to this cylinder head lastly one of the other great things about the dark custom program is you can tell them what you're doing and in this case with the camshaft specs and they were able to set me up with the valve springs and retainers that I needed to achieve the RPM and the lift numbers that I wanted to get making sure that I won't get into coil bind or valve float so that's sort of my thought about the bones of why I'm putting together this 582 as I move on you're gonna see us adding more and more things like valvetrain and the custom cam the Tamil Ram and all that stuff and eventually I will have it on the dyno with that quest for a thousand horsepower if I got to be honest I think it's got to make significantly more than that right we'll find out coming up as I build this brutal Dart 582 [Music] [Applause]

Channel: Dart Machinery

Views: 14,514

Rating: 4.9693484 out of 5

Keywords: David Freiburger, Big Block Chevy, Engine Build, Dart Machinery, 1000hp

Id: Ebv670xG5zo

Length: 5min 55sec (355 seconds)

Published: Thu Jul 02 2020