LS1 stock block and 853 head - no machining....
BTR Stage II cam, their dual spring, stock rockers with bushing trunion, stock valve, ls7 lifters...
WS6store/RPM mls head gasket

Did the EOIC method and got 13 rotation on pushrod checker...that gets me at 7.52" based on my calculations....with my combination does this sound right to you??? i've also soaked the ls7 lifters for 30 minutes prior to installing

Just mentally picturing this in my head...i don't see why my pushrod would be longer than stock but it is atleast 0.12" longer...

Just for giggles...i put in my stock pushrods....sure enough there is play in the rockers...so i guess it's def longer than the stock 7.4"...

 

Did you verify your length with a caliper? You can get an 8" one off of amazon for like 15-20 bucks considering stock block and stock heads .12 over seems a bit much to me.

 

Assuming this is a Comp adjustable pushrod, I get 7.45" for pushrod length with 13 turns.

 

Yeah I bought the $25 comp cam pushrod checker....

6.8 + ([# of turns] x 0.050) + 0.070 (LS7 lifter preload?)

I did all 8 cylinders and got 12.75 to 13.25 turns. Settled in the middle with 7.525". For sure the stock 7.4" is too short has I have play on the rockers.

just wanted to make sure I'm not missing anything. Did the EOIC method to find base and watch YouTube videos to double check.

 

you have done the checking correctly, just wondering where you got the preload of 0.070'' seem like a lot. I land at 0.050''. just my 2ct.

 

Yep, I didn't add your pre-load to my number. I would go larger on pushrod OD for stability at high RPM.

 

I read on here that preload for ls7 lifters are 0.050" - 0.1" and commonly used number is 0.070".

 

my pushrod came with the cam kit...i think it's 5/16" and 0.08" wall...


now i'm beginning to think....i had installed the stock 7.4" push rods in all the rockers to turn the crank and do the eoic method...i'm wondering if that had pushed the preload on the lifters down to where i'm reading a longer length than should be...i'm sure i did it properly in terms of measurement...but still feel 7.525" is long vs stock...i'd just hate to put in the new pushrod just to find out it's slightly too long and spend more money to get the right size....

 

I run .075" with my Ls7 lifters and imo the valve train is quietest when they are ran on the high side

 

7.4 seems right, thats what came in my kit from TSP and I didn't check anything and was quiet as a church mouse.

 

Measure again would be the safest way.

 

This is truth.
Some will argue that you're possibly leaving power on the table in higher RPM's but I'd rather have a nice quiet valvetrain with plenty or preload just the way the factory intended.

 

Any updates? Might be useful to those who look at this thread in the future if you post your final setup and findings.

 

I've decided to return my btr 7.4" and asked for 7.525" as exchanged...

 

I have a ls1 with 235/240 cam ls7 lifters and PRC 225 as cast 62cc heads. BC of the taller deck on my heads, my p-rod length came in at a final 7.475 including 0.050 preload. My setup makes no valve train noise. 7.5+ sounds high to me, but maybe I'm missing something.

Mine sounded high to me at first, so I checked, re-checked, and checked at least 10 more times. Id recommend doing the same just to be safe. That said, at the end of the day, it "is what it is"

 

i can't say i'm comfortable with what i went with...but i did everything that i read up and watched...so i'm rolling with it and let it be a learning lesson...

 

Let us know how it works out.

 

so far not good...i returned by btr pushrods...it left my post office in a priority mail envelope and it ended up at BTR with just a torn up envelope with my return paper inside....waiting to see what BTR can do for me...

 

Did all the pushrods fall out? I think you get $50 default from the USPS, you may need to speak with them as well. I just bought some military battery terminals. Shipper never sealed the envelope and they fell out. Fortunately, my mail lady figured it would be something I would buy and put them in the envelope and handed it to me to make sure.

 

this is what they sent me...right now it sux so bad....I'm SOL on pushrods...put claim in with usps... the guy I've been dealing with at btr stopped responding...I'd asked if there's anything they can do for me as a courtesy as I've spent over $800 with them...although I dont blame them for the lost package but I'm also out of a set of pushrods when I actually sent it to them and it got lost in transit...

so far my experience with btr has been sub par...calling their 800 number is impossible to get a hold of anyone during any time of day....leaving a message twice yielded no call back...they did price match snd item I bought...their website is hard to navigate...trying to find returning policy was difficult....looks like they reply back in fairly timely manner with emails....but right when I asked if there is anything they can do to help me out the conversation got silent....