20/06/2026
New Blocks about to be released from 440 Source 👌👌
We get constant inquiries about when our block will be available. It's taken a bit longer than expected, but everything is 100% set to go. Don't forget, the majority of aftermarket companies that have attempted to produce a big block Mopar block got put out of business because of it. Dick Bradshaw of Bulldog Performance tried it (the Bulldog block), went bankrupt. Muscle Motors tried it (the "Block"), out of business. Even Keith Black nearly went out of business until they got bought out (rescued) at the last minute.
The reason it's taking longer than expected is that we want to get everything 100% perfect. We were almost there, but we were having one last issue with keeping the cam bearing bores completely aligned without any deflection. The reason for this is that the arbor that bores the cam bearing holes has to be so small, and reach is so long (it enters from the front of the block, and the block is over 24" deep, meaning the arbor has to be close to 30" long), that by the time you get all the way back to the #5 cam bearing, which has a diameter under 2 inches, it's almost impossible not to have a few thousandths of deflection when boring that #5 cam bearing bore.
Even the original factory Mopar blocks were famous for this problem. Who has done a cam bearing swap/engine rebuild on an OEM block, and had the cam seize up when you try to install it? Even the original factory Chrysler engineers couldn't get it right. The makeshift solution is to cut slots into an old cam and "ream" the cam bearings after installation so they end up "aligned" in the misaligned block, but it's a pretty makeshift solution.
Our first thought was to just bore the front 2 or 3 cam bearings with a shorter mandrel, then turn the block around, and bore the rear two, but you can't do that either because you lose the exact centerline of the cam tunnel when you reposition the block on the fixture. You have to do all 5 at once.
So, the final solution, which we went with, was to design a super trick custom fixture which supports the cam bearing arbor on BOTH sides of the block (front and rear) so there is absolutely ZERO deflection whatsoever during the cam tunnel boring procedure. This also requires 2 brand new CNC machining centers which are specifically designed for this purpose. So you can see why this is taking longer than we initially expected. You can also see why trying to produce a Mopar engine block has put the majority of those who attempted it out of business.
SO, long story short, our final sample (with the new cam tunnel) will be done by the end of June, then we need to test, inspect, verify, etc. Then we can do our first actual production run. So we should definitely have them in volume on the shelf later this year. Thanks again for your support!
