Why people spend thousands of dollars on valvetrain parts, but won't spend a couple hundred on the proper tools to properly install said parts, is beyond me.
And the "safe zone" is bullshit that is repeated all over the Internet by people who don't know how these engines work.
http://www.amazon.com/OTC-7928-Valve-Spring-Compressor/dp/B0002STSMQ
Just spend the 80 bucks and never look back.
Then buy this:
http://www.amazon.com/OTC-6487-Serv...=2025&creative=386001&creativeASIN=B00063XMJ2
and both your piston and valve timing issues will be instantly solved forever.
This kit comes with a TDC locator/holder for the crank, two cam locks, and cam locators that fit into the rear of the D-slots on the stock camshafts so you can't get them out of phase when hanging the chains/sprockets.
Believe me it will be the best $180 bucks you ever spent. To know that it is done correctly and not damaging expensive parts is totally worth it IMHO.
You can use these tools to set your valve timing "straight up".
If you want to get into changing the valve timing events and advancing/retarding the cams from stock settings then you will need a degree wheel and dial indicator with extension, adjustable solid lash adjuster, etc.
If you never build another modular then sell the tools and recoup your money. Or rent them to friends and recoup your money. Or find them cheaper on eBay.
