When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Isn't the comp pushrod checker .050 per turn? 11 x .050 =.550 + 6.80= 7.35
Add the 1/8th turn is .006, so = 7.356 is what I get.
And add in the preload of .050 and I get a 7.406----looks like you used .069 preload, which I'm sure is OK.
the comp cams usually have a smaller base circle so slightly longer p-rods are required. not enough preload and you have that sewing machine sound. unfortunately alittle to long and valves may hang open or a collapsed lifter. the 7.425 should be perfect imo.
I have a seen a few people on here saying to actually measure the pushrod or pushrod checker. Unless you are using a specially designed tool to measure pushrods that will not be accurate. Pushrod length is not based off the end of one side to the end of the other. I have heard you can get away with that by subtracting .025 and be fairly close, but that becomes a guessing game.
I measured an old 7.4 pushrod so I would know how much the actual length is. Then I did the same with the checker to get my numbers. If I remember correctly the 7.4 came out to 7.418.
My valvetrain liked less preload on the ls7 lifters 10.5 turns on pushrod checker put me at 7.375 with .050 preload.Anything over .070 and mine was real noisy. I think the ls7 lifters like lower preload then higher.
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
7.425 pushrods? Is my math right? 
