MODIFIED MIC To quickly and easily measure the lash caps on late 2.0L & 2.5L Subarus with chain drive timing, I disassembled a 0 - 1” micrometer and turned down the measuring side of the spindle so that it will fit inside the lash caps. Having this measure makes...

THE FOUR WAY SLIDE We often times trust our senses. I trust my sense of touch in what I call, The Four Way Slide. The bounce test works, but this concentricity test tells you more. I slide the valve against the seat to the back, right, left, and back towards me. If...

SURFACING QUICK CHANGE I have made a quick-change for going between surfacing aluminum and cast iron heads. For aluminum heads I use a PCD plate and 750 tr/min on an arm with 2-strong bolts with guiding in a stone head. For steel I use grinding stones and 1800tr/min...

SINGLE EXHAUST VACUUM CHECKING If you are like me, you test all the valve to seats seal with a vacuum test. It’s not possible when you have a single exhaust system. What I use is plumbers’ putty on the valves of the chambers not being tested to assure a good seal. It...

SHIM IT I make a spacer to set in the recess of my Height Mics for small retainers.  I use two .060" and one .030" spring shims and I can use it on SB Chevy heads and others with small diameter springs. The A & B105 work for SB Chevy. Randy Torvinen Torvinen's...

QUICK VALVE SPRING CHECK For a quick check or if I don't have a Spring Height Mic that is small enough, I use a telescoping gauge to get the height off the head. Then I have various Valve Adjustment Discs I can use to simulate the retainer thickness and I don't have...