Help pushrod length
01-27-2019, 08:19 PM
#1
Staging Lane
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Location: Macon GA
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Help pushrod length This is my first motor I’ve ever built and I have a 5.3 with comp cam stage 3 turbo cam with ls7 lifters and ls9 head gaskets with 706 heads , if I measured everything correctly I need a 7.435 push rod . Does this sound right ? And where can I buy a push rod in this length?
01-27-2019, 08:49 PM
#2
ModSquad
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This is my first motor I’ve ever built and I have a 5.3 with comp cam stage 3 turbo cam with ls7 lifters and ls9 head gaskets with 706 heads , if I measured everything correctly I need a 7.435 push rod . Does this sound right ? And where can I buy a push rod in this length?
01-27-2019, 09:12 PM
#3
Staging Lane
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I put a push rod in my exhaust valve and rotated the motor until the push rod started to come up. I then put my push rod checker in the intake valve and adjusted it until I had no tap or movement in the rocker from side to side it up and down and made sure the rocker seated correctly which came out to 7.350 and I added .085 for pre load
01-28-2019, 07:01 AM
#5
ModSquad
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01-28-2019, 07:20 AM
#6
this stuff is maddening! you went for .85 preload LS7 lifters have a range of .200, Tick says he likes to go .100 on ls7 lifters, Try POWELL MACHINE they advertise a .005 tolerance between rods all the reading I have done says even the "name brand " can be off .015 or more, probably easier to find .450 or .425 and I think you'll be good!
01-28-2019, 08:30 AM
#7
I'd go with 7.450 if I had come up with those #.
Remember, metal doesn't grow as it ages, it only wears.
I'd also strongly suggest measuring more than one cyl. I'd suggest the 4 at the corners (1 2 7 8), at the very least.
Remember, metal doesn't grow as it ages, it only wears.
I'd also strongly suggest measuring more than one cyl. I'd suggest the 4 at the corners (1 2 7 8), at the very least.
