I am at loss of ideas on how to fix this other than the obvious pulling the head(s) and changing the (or all of them) lifter out.

Brand spank and new Summit LS 5.3 450hp crate....fired it up tonight and it made quite the ruckus on top (despite priming it before hand obviously)....and being all to familiar with first gen SBC and BBC, I knew just about immediately we had a valve train issue....I decided to be naive and just let it get to temp in hope it would pump up but alas no such luck.
Pulled the driver side valve cover for inspection and sure enough, #7 exhaust wont pump up, I can push on the pushrod with my thumb and it will bottom out the lifter and then come back up.
I do get oil thru the pushrod, and all other rockers are fine, rock solid as they should.

Any ideas or "things to do" before I get to have more fun pulling head(s)?? I am going to let it idle tomorrow for a while, again, probably naive of me but, I have nothing to loose. Thoughts?


At least worth a pic lol....1965 C10 turbo set up

 

What did you do,I have the exact same motor 450hp 5.3 brand new,#4 not pumping up,oil in rod but that's it..makes me really skeptical of this 5,000 dollar motor I just bought

 

How long have you run it?

 

i did a warranty claim and they paid for my labor and all new BTR lifters and tray

 

Just priming like they said to do,just bolted on a starter,to get it turning over,all but #4 started oiling ,tried and tryed,makes me sketchy about rest of the motor after dropping 5 grand on it

 

Just priming like they said to do,just bolted on a starter,to get it turning over,all but #4 started oiling ,tried and tryed,makes me sketchy about rest of the motor after dropping 5 grand on it

 

Lots of times the lifters only get fully pumped up after starting and running the engine for a bit.
If you're worried call the builder.

 

@Acavedigger,

We're sorry to hear about the difficulties you're facing with getting a lifter to pump up in the SUM-150153 engine. We understand how frustrating that can be. If you have any warranty concerns, please don't hesitate to reach out to ATK Engines, as they built these engines for us. You can contact them Monday through Friday from 8 AM to 5 PM CST at 800-421-3746.

If you have additional concerns, please Contact Us directly.