POPP TOP
April 2, 2025
THE AUTO BUILDER
Featured
30 Years And Counting
Television has created an unusual interest in all things high-performance, both cars and trucks. On any night you can watch some creation of modified vehicles, and even though there’s not much reality to the builds, you can get a good idea of what’s going on. But don’t get your hopes up: Unlike the team of experts that supposedly does this in a week, your build will probably take six months or more, and longer at some shops. While you can witness a number of world-class cars rolling across the auction block, commanding huge prices from over-?enthusiastic bidders, you will find that this, too, is not the reality that most of us live in each day, as many auction samples are some of the more rare in existence. The one thing each of these shows has in common is that typically the owner rarely gets his hands dirty and if there is any owner involvement, it is often limited to writing a check.
This no doubt is a great way for some to enjoy the hobby, but it’s not the approach that most enthusiasts take, and that includes Rick Finzer. As a way of introduction, Finzer is the event coordinator for a much respected Florida car show and swap meet known as the Turkey Run. The legendary Turkey Run is celebrating its 33rd anniversary and is well known by most enthusiasts, and Finzer has been involved since its inception.
Remembering Alex Xydias
The automotive world lost a true legend with the passing of Alex Xydias in 2024. Born in 1922, Xydias was not just a figure in hot rodding; he was a driving force whose innovations and passion forever changed the landscape of the industry. His life was a journey of relentless pursuit—of speed, of innovation, and of community.
RAPID TRANSIT SYSTEM
Considered a “gentleman’s muscle car,” the upscale Plymouth GTX two-door hardtop was restyled in 1970, offering cleaner side body panels along with revised front and rear fascias. The grille had a unique telephone-receiver look to it, the taillight treatment was changed, and the car was no longer available as a convertible.
Spotlighter
Product Spotlight: Bill Mitchell Products Aluminum LS Engine Block
Lightweight Muscle for Serious Builds
If you’re building an LS engine meant to dominate the strip, carve canyon roads, or simply crush the scales on any dyno, the BMP‑086515 Aluminum LS Engine Block is your ticket. Built from high-strength 357T6 aluminum alloy, it weighs a mere 135 lbs with caps and sleeves, giving you a rock-solid foundation without the ballast of a cast iron block. In short: strength where you need it, weight where you don’t.
Author
The Auto Builder Staff
Photos Courtesy of Bill Mitchell Products
Precision Dimensions for Big Performance
The block sports a 9.240″ deck height with 4.115″ cylinder bores and 4.400″ bore centers, perfectly engineered for aggressive builds while maintaining true LS compatibility. Five billet steel main caps, all four-bolt and cross-bolted, keep the crank planted no matter how hard you push. Torque the studs to 75 ft-lbs, the cross bolts to 30 ft-lbs, and you’ve got a bottom end that laughs at high RPMs and boost alike.
Rebuildable and Engineered for Longevity
Each cylinder comes with a replaceable dry ductile steel sleeve, pressed to exact tolerances for maximum durability. Builders can safely bore up to 4.165″, opening the door to serious displacement upgrades. And with priority main oiling and dry-sump provisions, this block ensures your engine gets the lubrication it demands under even the harshest conditions. Screw-in freeze plugs, cam plug, all dowel pins, and pipe plugs come included—this block is ready to go straight from the box to your build.
Built for Builders
Every detail of the BMP‑086515 is designed with the engine builder in mind. Standard GM LS bearings, camshaft placement, and lifter bores make assembly predictable, while the block’s LSX head bolt pattern and drilled-and-tapped motor mounts give you flexibility for retrofits or high-performance swaps. From oil passages to bearing alignment, Bill Mitchell has dialed in the details so your build goes smooth and fast.
Quick Specs
Application: High-performance GM LS replacement
Material / Weight: 357T6 Aluminum, 135 lbs w/ caps & sleeves
Deck Height: 9.240″ (standard) | Bores: 3.990″ or 4.115″, replaceable dry sleeves
Main Caps: 5 × 4-bolt billet steel, cross-bolted
Cam / Lifters: Standard GM placement & tie-bar lifters
Oil System: Priority main, dry-sump provisions
Stroke Clearance: Up to 4.250″ steel rods
Head Bolt Pattern: LSX standard | Motor Mounts: OEM & SBC retrofit-ready
Freeze Plugs / Starter / Water Pump: Stock
Why the BMP Aluminum LS Engine Block Stands Out
This isn’t just another LS block—it’s a high-performance weapon. Lightweight, rigid, and engineered for serious horsepower, it’s perfect for boosted monsters, high-revving naturally aspirated screamers, or retro LS swaps into classic rides. If your goal is power, precision, and bulletproof reliability, this block won’t just meet expectations—it will crush them.
Classic engineering. Modern muscle. Builder-approved.
👉 Ready to turn your LS vision into reality? Grab the BMP Aluminum LS Engine Block today at BillMitchellProducts.com
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