What does 'chasing the head bolts' mean?
Documented on the Chevrolet Small Block 350 (sbc 350) build
Published February 26, 2026
Chasing means running a thread chaser or appropriate tap through the head-bolt holes to clean and restore the internal threads so fasteners can properly seat and be torqued.
Documented In This Build
Related Knowledge
Can I use a cutting tap instead of a thread chaser?How do I know if a bolt hole is too damaged to chase?Where do I find the correct torque specs and sequence?How important is degreeing the cam?What torque sequence and values should I use for SBC heads?How do I set lifter preload or hydraulic lash?What should I do to prepare the engine for first start and break-in?What torque should I use on the crankshaft bolt?
Related Parts
Assembly lube
$12
Head bolt set (replacement)
$80
Head gasket set (MLS or OEM)
$120
Penetrating oil / solvent
$8
Shop rags / cleaning supplies
$10
Related Tools
Torque wrench
Breaker bar / ratchet and socket set (including deep sockets for head bolts)
Thread chaser / bottoming tap for head bolt holes
Compressed air or hand pump
Wire brush / small nylon brush
Related Videos
Small Block Chevy 350 Build Pt. 6 | This Is How It's Actually Supposed To Be Done
Small Block Chevy 350 Build Pt.3 | Filing rings and checking main clearances
Small Block Chevy 350 Build Pt.5 | Continued frustrations with rod clearances
Small Block Chevy 350 Build Pt. 11 | Installing the intake manifold and figuring out sbc nuisances
Small Block Chevy 350 Build Pt. 7 | Checking Crank Clearance and installing the rods.
Small Block Chevy 350 Build Pt. 8 | Installing Camshaft and timing components