There's a long-standing assumption that the Chevy 348/409W engine is a nostalgic relic from days gone by. But as we showed last month, fresh aftermarket goodies have breathed new life into the W--576 hp, to be exact. Best of all, much of this attention is aimed at the inexpensive-to-buy 348, which was produced in far greater quantity than the more-sought-after 409.
So far we've watched as Joe Jill and the Superior Automotive crew packed the 348 block with an Eagle stroker crank and H-beam rods and forged Ross pistons to transform it into a rugged 434-cube torque maker. Now let's pick things up with a close look at Edelbrock's new Performer RPM 409 heads and perform the final assembly and dyno test.
What We Did
Built a 434ci stroker
The proof is in the numbers
In a collaboration of Lamar Walden and World Products, a new cast aluminum W engine block has just been released. With 4.50-inch bores it is a 509 right out of the box but can be stoked all the way to 609 ci. The bottom-end architecture, oil pan rail, and front cover are adapted from the big-block Chevy, but otherwise it accepts all W-engine external bolt-on parts and looks virtually stock. Just spray it orange and nobody will ever know. Stuff it with just-released forged pistons from Keith Black. There has never been a better time to build a W engine!
The 348/409 oiling system is identical to the '65-and-up Mk IV big-block except for the ex
Like all pre-'68 Chevy engines, the W block uses a canister-style oil filter with a replac
Though GM likely experimented with aluminum 409 heads, none made it to production. Edelbro
This Edelbrock R&D cutaway shows the revised port floor short turn radius that's incorpora
Patterned after OE big port L80 (409/425hp) heads but with improvements, Edelbrock heads f
The 220cc intake ports are delivered with machined steps (pen points) that can be ground s