THE SHOP

April '20

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APRIL 2020 THE SHOP 35 PRECISION ENGINE air and fuel. We then switched to a fattened 850-cfm carb, which allowed us to grab a few more ponies at 580 hp. We then switched to the Holley Sniper EFI, which brought us up to 615 initial hp. The Sniper features a self-learn feature that tunes as engine operating time increases. However, since we were unable to custom-tune either the MSD ignition or the EFI, we were eventually stonewalled at 631 hp at 6,300 rpm—with a somewhat impressive torque rating of 563 pound-feet at 4,800 rpm. While we didn't reach the desired numbers, we know further custom-tuning via ignition timing and fuel delivery will surely provide substantially more power. At least we established an accept- able baseline. On the plus side, we experienced no oil or vacuum leaks and no funny noises (you know what I mean!). We initially ran the engine with COMP 10W-30 break-in oil, switching to 30W Brad Penn break-in oil after the initial pulls. From there, the engine was raffled off at the 2018 PRI Show in Indianapolis. MIKE MAVRIGIAN owns and operates Birchwood Automo- tive in Creston, Ohio, where he builds custom engines and street rods, and performs vehicle restorations. He has written thousands of technical articles, as well as nine books on automotive technology during the past 30 years. Mike can be reached at (330) 435-6347 or birchwdag@ frontier.com. Visit Birchwood's website at www.birchwoodautomotive.com. OUR FASTENER TORQUE SPECS 7/16" main bolts or stud nuts 65 lb-ft (w/CMD lube) 7/16" head bolts or stud nuts 90 lb-ft 3/8" head bolts or stud nuts 55 lb-ft 8mm head bolts or stud nuts 28 lb-ft Crank snout bolt (ARP) 235 lb-ft (w/ARP lube) Rod bolts (ARP 7/16" 2000) 70 lb-ft / 0.0062"stretch max Valley plate bolts M8x1.25 18 lb-ft Cam gear to cam bolts 25 lb-ft Cam retainer plate 18 lb-ft (w/threadlocker) Oil pump to block M8x1.25 18 lb-ft Oil pump pickup to pump M6x1.0x20 bolt 106 lb-in Oil pan 8mm fasteners 18 lb-ft Oil pan 6mm fasteners 106 lb-in Oil pan drain plug 18 lb-ft Rocker arm bolts 22 lb-ft Front and rear cover 8mm bolts 18 lb-ft Cam sensor to front cover 106 lb-in Crank sensor to block 18 lb-ft Water pump bolts 22 lb-ft Water temp sensor to head 15 lb-ft Intake manifold bolts 106 lb-in Valve cover bolts 106 lb-in Coil pack mounting bolts 90 lb-in Flywheel bolts (in 3 steps) 74 lb-ft (w/thread sealant) DEALER & DISTRIBUTOR INQUIRIES WELCOME 800.264.9472 • DesignEngineering.com THERMAL ACOUSTIC CONTROL THERMAL ACOUSTIC CONTROL THERMAL ACOUSTIC CONTROL THERMAL ACOUSTIC CONTROL COMPLETE YOUR JEEP CUSTOM HEADLINER AVAILABLE FOR JL & GLADIATOR MODELS COMPLETE YOUR JEEP CUSTOM HEADLINER AVAILABLE FOR JL & GLADIATOR MODELS • AVAILABLE FOR WRANGLER JL & GLADIATOR MODELS • CNC CUT FOR PRECISE FIT • AVAILABLE FOR WRANGLER JL & GLADIATOR MODELS • CNC CUT FOR PRECISE FIT

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