What pushrods lenght are you running with Ls7 lifters?
10-30-2012, 10:49 AM
#1
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What pushrods lenght are you running with Ls7 lifters?
I have been reading some people say they are .5 inches taller in the lifter.
It also says they are the stock replacement lifter.
When I do the cam swap I am reusing non milled heads and new stock .053 head gaskets
Can I keep my new 7.4 pushrods or will the be to much pre load on the lifters?
It also says they are the stock replacement lifter.
When I do the cam swap I am reusing non milled heads and new stock .053 head gaskets
Can I keep my new 7.4 pushrods or will the be to much pre load on the lifters?
10-30-2012, 11:58 AM
#3
I used 7.350" pushrods for 0.075" preload, measured with a pushrod length checker, stock 706 heads and stock Felpro graphite gaskets.
Then I went down to 7.325" pushrods when I got 799 heads milled 0.022" with LS9 gaskets, same preload.
10-30-2012, 02:31 PM
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What is the pre load range? .6-.9?
For got to mention 1.8 yella terra rockers are installed does this affect anything compared to stock rockers when measuring preload?
For got to mention 1.8 yella terra rockers are installed does this affect anything compared to stock rockers when measuring preload?
10-30-2012, 02:49 PM
#5
Depends who you ask, but IMO, 0.050" - 0.100" is an acceptable range. I would go with a little more preload than less for a quieter valvetrain. Comp sells their pushrods in 0.025" increments so you can at least get into the upper half of that range. Do a search on tech too in the gen III internal engine section.
10-30-2012, 05:49 PM
#6
It depends on the motor in my opinion. We have seen some motors need a shorter push rod and some not. Its always best to use an adjustable push rod length checker and measure.
To the poster above who purchased longer push rods for a longer lifter, you should have got shorter push rods if anything. I bet it made a lot of noise if you started it.
To the poster above who purchased longer push rods for a longer lifter, you should have got shorter push rods if anything. I bet it made a lot of noise if you started it.
