push rod 503
I think you can get a Lunati Timing set off of Summit for a good price.
P.S. Your sig says '96 Z27
no really tho while that net me some more lift or what and they are stock heads never been off the car ... You said that YOU never had the heads off, are you positive they were never taken off ever? If so, then 7.2" 'should' be fine. But measuring is always your best bet.
If not then get a PR check tool as noted and repeat process by setting it to .050 longer/shorter incriments. I have a cheap plastic T metric ruler I push the PR tool against and use a small metal straight edge against the other and "adjust" the PR tool to whatever length I want. Good idea to put a small piece of tape on PR tool to keep the "new" length exactly where you set it.
If the witness mark is towards exhaust than a shorter PR. If it is towards the engine a longer PR.
Typically PR come in .050 length difference. Trick Flow is a good one, many others.
Don't F around with valve train geometry. get it right or severe wear will result. PR length, valve lash preload are 2 things if you F up can cost big $ later.
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When at #1 TDC you can adjust the following valves:
Intake: 1, 2, 5, 7
Exhaust: 1, 3, 4, 8
Rotate the crank one revolution until the pointer is again at 12 o'clock. This will let you adjust the remainder of the valves. If you did #1 the previous time, you should be now at #6 TDC.
When at #6 TDC you can adjust the following valves:
Intake: 3, 4, 6, 8
Exhaust: 2, 5, 6, 7
For each rocker, all you have to do is back off the set screw and slowly tighten the lock until it seats on the rocker (it will just stop). Then add your preload (I used 1/2 turn) with a 16mm wrench. Then tighten the set screw and finally since down the lock again.
That's the initial adjustment, it will get the car running. Once the car is running, you'll want to have the valve covers off and redo each rocker one by one (not following the numbers above) one side at a time. Back off the set screw again, loosen the lock, the rocker will clank and wobble around. Then follow the same procedure as before...slowly turn the lock til it seats, add 1/2 turn, seat the set screw, tighten the lock good and tight. Then move on the the next one.
The adjust the second time around should make your rockers PERFECTLY aligned. It's best to adjust them again with the car running to make sure that your first adjustment wasn't off because the lifters bled down or anything.
When at #1 TDC you can adjust the following valves:
Intake: 1, 2, 5, 7
Exhaust: 1, 3, 4, 8
Rotate the crank one revolution until the pointer is again at 12 o'clock. This will let you adjust the remainder of the valves. If you did #1 the previous time, you should be now at #6 TDC.
When at #6 TDC you can adjust the following valves:
Intake: 3, 4, 6, 8
Exhaust: 2, 5, 6, 7
For each rocker, all you have to do is back off the set screw and slowly tighten the lock until it seats on the rocker (it will just stop). Then add your preload (I used 1/2 turn) with a 16mm wrench. Then tighten the set screw and finally since down the lock again.
That's the initial adjustment, it will get the car running. Once the car is running, you'll want to have the valve covers off and redo each rocker one by one (not following the numbers above) one side at a time. Back off the set screw again, loosen the lock, the rocker will clank and wobble around. Then follow the same procedure as before...slowly turn the lock til it seats, add 1/2 turn, seat the set screw, tighten the lock good and tight. Then move on the the next one.
The adjust the second time around should make your rockers PERFECTLY aligned. It's best to adjust them again with the car running to make sure that your first adjustment wasn't off because the lifters bled down or anything.

The CC503 cam only build should be enough to break into the 12's. With a big enough shot, 11's are possible.





