Measuring push rod length...do I have too much variation??

[87LtdT]

Is it normal to have +/- .020" length from rocker arm to rocker arm??

Don't know exact length yet but I measured and set the adjustable pushrod length for #1 exhaust. #3 exhaust was .020" shorter than #1 exh, and #3 intake was .012" longer than #1 exh.

Is this too much variation or normal??

Thanks, Bob

 

[TurboBob]

who did the heads?

 

[87LtdT]

Nick Micale heads.

Bob

 

[TurboBob]

Are all the intakes the same height? Are the heads fresh or have they been run?

Generally, the heads should have the valve stems the same height, as the stock valvetrain is non-adjustable. Whats the spread?

Bob

 

[87LtdT]

Slightly over 3800 miles on the heads...

 

[JDSfastGN]

the couple of heads Ive messed with seem to be about the same. To get .030 preload with my adjustable pushrods the range was from 8.07 to 8.093 (end to end for the measurement) to get it right. Using a straight edge on the valves, a few of the valves are slightly off. Ive seen this on my heads as well as a set of Champions.

 

[87LtdT]

Thanks JDS....are adjustable pushrods my fate?? I have .032" total variation within 3 valves!! Now if that was the total variation I could probably live with it as there is undoubtedly enough range within acceptable adjusting screw location that I set each independently.

Bob