440 Source

440 Source America's #1 source for Big Block Mopar parts! 440 Source is an American owned and American run corporation.
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In business since 2003, we have recently moved to our fifth location, a 10,000 square foot warehouse in Carson City, Nevada. Our warehouse is filled with floor to ceiling shelving racks of nearly every part you could need to build a big block Mopar engine. We are the only business in the world with an entire warehouse dedicated to nothing but big block Mopar parts.

We got a ton of questions on the weight of our new blocks. So here it is folks! 303 pounds with main caps installed but ...
02/11/2026

We got a ton of questions on the weight of our new blocks. So here it is folks! 303 pounds with main caps installed but otherwise bare. A factory 440 block is about 230 pounds for comparison.

Doing some A to B comparison with our new block. Three times the strength for half the price. On the Megablock, you run ...
02/04/2026

Doing some A to B comparison with our new block. Three times the strength for half the price. On the Megablock, you run out of material before the thrust bearing face can even get to the outer edge of the circle. You don't need a degree in mechanical engineering to see that our new block is an absolute beast and orders of magnitude stronger than ANY other iron 440 block ever made.

More new products coming! The Mopar community has been neglected for valve covers that *fit* and seal with no fuss, so w...
01/30/2026

More new products coming!

The Mopar community has been neglected for valve covers that *fit* and seal with no fuss, so we’ve designed our own new set of cast aluminum valve covers that do just that. These will work with aftermarket aluminum heads only, pictured here on a Stealth head. The fit is excellent.

Coming Spring 2026

Questions about the oil pickup: The builder will be able choose between 3/8 or 1/2” internal pickups using a bolt-on ad...
01/30/2026

Questions about the oil pickup:
The builder will be able choose between 3/8 or 1/2” internal pickups using a bolt-on adapter for crank strokes up to 4.250”, or use the external port for a -12 o-ring and run the oil pickup to the outside of your pan.

More block photos. See captions.
01/30/2026

More block photos.
See captions.

GASP! 😱 What could it be?Yes, we have received two blocks. These are the prototypes that just arrived this morning, fres...
01/29/2026

GASP! 😱
What could it be?
Yes, we have received two blocks. These are the prototypes that just arrived this morning, fresh from machining. We understand that everyone is excited, and we are too. Thank you for being patient while we make sure the QC is right on point. We will be installing cam bearings, intermediate shaft bushing, checking lifter bores, etc. and we will post another update soon. We are probably looking at 2-3 months until we have stock on the shelf which you can order. Sorry, we aren’t taking pre orders until we can deliver. We do have a waiting list if you want to call and add your name to it.

We've been busy moving what has got to be the largest collection of Big Block Mopar parts on the planet. How many? 245,1...
01/02/2026

We've been busy moving what has got to be the largest collection of Big Block Mopar parts on the planet. How many? 245,196 individual items totaling 468,781 pounds. Not to mention the machinery, shelving & pallet racking, forklifts, desks, file cabinets and other office equipment. It's been quite a week!

12/22/2025

The question we get all day long... How are the blocks coming? Well, we've spent the last 2 months making 14 different large steel fixtures (cradles) to hold, position and support the blocks as they go through the various CNC machines which do all the milling, drilling, boring and surfacing. Now that we've finished with that, we are perfecting the CMM dimensional inspecting, and it shouldn't be too long until we can go to production. We are still expecting to have them for sale by Spring. Here's a cool little video we've made that shows some of the progress..

Address

2300 Arrowhead Drive
Carson City, NV
89706

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

+17758832590

Website

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