Top Mistakes Builders Make Before Engine Assembly

Building a performance engine takes precision, patience, and the right prep work. Even experienced builders can make small mistakes that lead to costly failures later. At Fastime Performance in Taylor, Michigan, we see it often — and help fix it. Here are some of the most common mistakes to avoid before engine assembly.

Skipping Proper Cleaning and Inspection

Machined parts must be spotless before assembly. Any debris, machining grit, or oil residue can damage bearings or cause premature wear. Always clean the block, crankshaft, and oil passages thoroughly before starting.

Incorrect Bearing Clearances

Even a few thousandths of an inch make a difference. Bearing clearances that are too tight can seize an engine; too loose and oil pressure will suffer. Our team uses micrometers and bore gauges to verify every tolerance before assembly.

Failing to Check Deck Height and Piston-to-Valve Clearance

Improper deck height or piston-to-valve clearance can cause low compression or mechanical interference. Precision measurements and mock assembly ensure proper fit before final torque-down.

Neglecting to Balance the Rotating Assembly

Skipping balancing is one of the biggest performance killers. A balanced assembly runs smoother, makes more power, and lasts longer. Every engine we assemble in Taylor, MI is fully balanced before final build.

Before you start your next build, bring your components to Fastime Performance for professional machining and measurement. Call (734) 947-1600 or stop by our Taylor shop for expert help that keeps your engine together and on track.