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> BMP 409 "W" Block
BMP 409 "W" Block

The BMP 409 aluminum "W" block IS HERE! The first batches have arrived and we are shipping them in the same order as the orders were placed. There will be a limited number of these available after all the pre-sold 409s have been shipped! So if you have not ordered one, you had better order one NOW! Future production runs will be produced in very limited numbers sometime in the future.

It is basically a Big Block Chevy. It accepts the following to assemble it...
1. BBC crankshaft up to a 4.250" 2. BBC harmonic balancer 3. BBC connecting rods 4. Custom 409 pistons 5. BBC timing chain and cover 6. BBC camshaft but with 409 lobe positions 7. 409 Lifters 8. BBC starter 9. BBC oil pan 10. 409 style water pump 11. 409 pulleys and brackets with the exception of needing a BBC bottom crank pulley ( Lamar Walden Automotive has a complete serpentine belt set up if needed )

Please contact Lamar Walden Automotive as he has researched all the custom parts required and probably has them on the shelf!

If you have any additional questions, feel free to contact us.

The 409 is here!


409 Aluminum Block Specifications
Deck Height: 9.600
Std Bore Size:.4.240
Max Bore Size:4.530
Cylinder Bore Spacing: 4.84"(stock)
Crankshaft: Standard BBC clearanced for 4.250
Rods: Standard BBC
Pistons: 409 special w/valve notches relocated
Cam: 409 special w/BBC cam bearing journals
Cam Location: Standard BBC
Lifter Location: Standard 409
Lifters: Special 409 Lifters
Lifter Angles: Int.45°/ Ex.45°
Timing Chain: Standard BBC
Oil Pan: Standard BBC
Oil Pump: Standard BBC
Oil Pump Drive: Standard BBC
Timing Chain Cover: Standard BBC
Water Pump: Standard 409
Cylinder Heads: Standard 409
Intake Manifold: Standard 409
Distributor: Standard BBC w/.300 spacer under the collar


BMP 409 "W" Block
BMP 409 "W" Block BMP 409 "W" Block BMP 409 "W" Block
BMP 409 "W" Block BMP 409 "W" Block BMP 409 "W" Block
Product Video
product info
product variations
085575 BMP 409 Chevy "W" Aluminum Block
4.240 Bore, Standard Cam Location
Billet Splayed Main Caps
TO PURCHASE: Please "click" the small box to the right of the "BUY NOW" button first.
related products
703242 841125DF-4240 Cylinder sleeve, BMP "409" aluminum block, 4.240" bore, dual flats (generic photo)