Anyone have any thoughts on the darton sleeves they make for our motors? Looks like you can go out to 440ci with a shorter stroke. C.
Spring 2008 Hotrod magazine has Do it yourself 6.1 to 426 conversion useing Darton sleeves and a very interesting read. I guess just the sleeves and machining operation costs 3800. bucks. You still got to buy Crank,Pistons,Rods,Head, and whatever else you need. Check it out this article spells everything out,also claims several supercharged 426's over 700 at the crank. Detailed photos and all the vendor contact info and even showed the cnc machining process which gave me a chubby. anyone local that wants to tackle this build I offer my machining services. Not that im an engine builder but I havent been bagging grocery's last 19 years.lol They didnt build a 440 but I think it could be done. I was impressed with the sleeves but the wall is still very thin when punched out It seems they could be beefed up in other area's inside the water jacket. No one said they had to be round????
I think if I was going to remove the cylinders to insert sleeves, I would want it done on a CNC that has already done the work. The article you speak of is about Superior in Ca. If anything is cut wrong, the block would be toast. C.
I didnt think you would fall for it lol. But Boring holes on location is boring holes on location its not majic. If you have sleeves and you know where they go thats a blueprint that any capable machine shop could accomplish. Most shops work to tight tolerances daily and should be able to bore a hole to size,correct depth,and location square and true to the world.
Well that is good to know. I am thinking of moving in this direction and I am keeping my eye on the new G&S blower or the PPP turbo. I have a spare block that I would bore out to rebuild and refresh the Indy 426 motor I currently have in my car and then maybe sell it if I like the sleeved motor better. The PPP Indy 426 has been real good to me. I have like 25k miles on it already. C.
I am thinking about it. I really like the whole 426 thing. If I go the 426 route, the sleeves can be bored to make a 440 in the future. C.
If it's a 440 with sleeves I would be very wary. It's huge money for 14 cubic inches. These aren't race cars, they're 2 ton, 4 dr passenger cars.
I think it would be a better option for a 426 motor as well because we can have a bigger bore and a shorter stroke. When a sleeved 426 is worn out, it can be punched out to a 440. C.
Yes HHP has a 440 in the works hmm makes me wonder I know a couple machine shops around here that do sleeves hmmmm......
The darton Sleeves are nice but very expensive to do ($3000.00) for the kit and machine work I would wait for the Aluminum block from Mopar, bore is 4.150 ....x 4080 stroke = 440 ci (441) Scott GS Motorsports Richwood Group
426 and the 440 rod ratio is: 1.50 if it's on a 6.125 rod Rod ratio = rod length / stroke (4.080 / 6.125) 1.50 :stretcher:
I like that response. Last time I brought up the aluminum block. The vendor's response was it is not a good street block and would not be recommended. I am sure because this would stall everyone looking at doing block work and buying engine kits..... at least bore work, the stroker may still be usable. Thanks for stepping up Scott....way to go. 2 points GSM
I thought the Mopar aluminum block was based on the 6.4L 392 bore. So the 4.150 bore must be the machining limitations. Once the block is machined to a larger bore the same situation is going to take place... the same rod ratios...the same thrust angles... the same need for more and more power output... etc... etc... A 1.50 is probably the lowest rod ratio I'd go with or use but since we can't raise the deck height, (Yet)... what's a sport enthusiast to do? Lol
The guy at Superior said he has a few putting out 700rwhp with a blower. Not sure they are 440's. I am thinking they are 426's The rod length is 6.125. So what is the Indy rod ratio? C.
