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FE Technical Forum / Measuring Ppushrod length
« on: March 17, 2026, 09:14:47 AM »
Measuring for pushrods variation in lengths Question;
1) I am building a 445 stroker with most parts and pieces from Lykins Motorsports. Trickflow heads, Precision Oil Pumps stands/rockers/shafts, fasteners.
2) I am using Morel hydraulic roller lifters
3) I am using Smith Brothers pushrod length tester, .001" dial indicator.
Process
1) It's my understanding the landing pad on TF heads comes tall for most application of stands to accurately setup valve train geometry. I cut the stands .128" measuring from the base of stand to the open bore of the rocker stand. (side note; I found the outer stands are different lengths vs interior stands including variations w/in the groups as well. If found I had to measure each stand and adjust the BP mill each time. This was determined by the variation in overall height differences and having to use the top of the standing as the base in the machine vice.)
2) My bases are now .761" +/- .001", roller tip engaged in the middle of the valve tip, a wider profile pattern than I would like (or referenced web)
3) head gasket installed, valve train mocked-up
4) I loosen the valve train to lift the Smith Brother device out and measure for PR length, re-tighted to measure the next
5)**The issue is I measure #1 thru #4 ex/In w/ variation between 8.618" thru 8.665"; I used the same lifter pair to be consistent. Measure with checker to just engaging the rocker of "0" motion.
6) My thoughts are (lying in bed this AM); does TF head valve seat have variations, does the valve lash on the adjuster need to be "0" or predetermined location?
7) Does the lifter need to be pumped-up with oil?
Thanks for input, I am posted on FE engine enthusiast FB site as well.
**I am in an engine machine class; personal enrichment.
GA
1) I am building a 445 stroker with most parts and pieces from Lykins Motorsports. Trickflow heads, Precision Oil Pumps stands/rockers/shafts, fasteners.
2) I am using Morel hydraulic roller lifters
3) I am using Smith Brothers pushrod length tester, .001" dial indicator.
Process
1) It's my understanding the landing pad on TF heads comes tall for most application of stands to accurately setup valve train geometry. I cut the stands .128" measuring from the base of stand to the open bore of the rocker stand. (side note; I found the outer stands are different lengths vs interior stands including variations w/in the groups as well. If found I had to measure each stand and adjust the BP mill each time. This was determined by the variation in overall height differences and having to use the top of the standing as the base in the machine vice.)
2) My bases are now .761" +/- .001", roller tip engaged in the middle of the valve tip, a wider profile pattern than I would like (or referenced web)
3) head gasket installed, valve train mocked-up
4) I loosen the valve train to lift the Smith Brother device out and measure for PR length, re-tighted to measure the next
5)**The issue is I measure #1 thru #4 ex/In w/ variation between 8.618" thru 8.665"; I used the same lifter pair to be consistent. Measure with checker to just engaging the rocker of "0" motion.
6) My thoughts are (lying in bed this AM); does TF head valve seat have variations, does the valve lash on the adjuster need to be "0" or predetermined location?
7) Does the lifter need to be pumped-up with oil?
Thanks for input, I am posted on FE engine enthusiast FB site as well.
**I am in an engine machine class; personal enrichment.
GA