Drill the lifter holders to drain oil better.

 

Are u enlarging drainback holes or puttin in "new" holes in the 1st place. How big? Any downside?

Got my Crane valve spring tool from VHP today. I ordered it Fri., & MOn. wasn't a shipping day. That's pretty quick I think. Parts from SD should be here in a few days too.

 

so we are putting the blower on this weekend

 

The change from the two piece to the integrated seal and seat was in fact in 01, my truck is an 01 and originially got the wrong seals back years ago when I did a cam swap on my 5.3. The dual spring kits you have to pull the stock seals off, even if you have the later style seal, a steel spring seat is placed there that is supplied with the dual spring kit then you put the old style stem seal on there that doesnt have a seat then the dual spring slips over all that and you put the retainer supplied with the dual spring kit on instead of the stocker. You can get patriot dual spring kits for 255 and they come with ti retainers too along with new seals due to being a dual spring kit, not a bad deal once you factor those two things into the cost of them.

Ive had/used the PRC, Patriot and Livernois dual spring kit and to me it looks like they are all supplied by the same company with just a different name slapped on them, there is no visual difference in them as far as how theyre designed.

 

The people who do so are adding new holes to them. If I recall right, the new holes end up being about a ½” in size and from my understanding where you need to be careful is in dealing with the old lifter trays, the plastic can become brittle with age/heat and you can accidently crack them when trying to drill the holes. If you’re looking to do this modification, you may be better off purchasing a new set of lifter trays to work on. Besides that, the new lifter trays may not be a bad idea anyway, so that they hold the lifters better if down the road you decide to do another cam swap. Of course this only applies if you’re planning on pulling the heads to mess with all this stuff.

 

From what I've read, there is some debate as to if this is a worthwhile mod...I believe that there is a write up with pics about it in Handel's book though...IIRC

 

Handel?

On another note, I got my SD box of goodies today. Getting closer. I sure hope I can get .9 outta a cam swap like u did Billy!

 

Ooops, misspelled, it's Will Handzel, he has a book called "How to Build High-Performance Chevy LS1/LS6 V8's". It's a pretty cool book, a little dated now, but still has some good info. Mine's in a box somewhere that I haven't opened since the move yet.

Yea, my gains were great, but I'm still slow lol. I bet that if you get it tuned right you'll be very happy with the results

*EDIT* There's some pics in this thread of the drilled lifter retainers, post #16: https://ls1tech.com/forums/generatio...er-oiling.html

and this thread from our own good ol' PT.net, straight from the book... (this is the thread that I was looking for...I actually found it on google): https://www.performancetrucks.net/fo...d.php?t=452295

 

It’s from 2005 and Wheel to Wheel Powertrain is no longer in business, but this is what Kurt Urban (Director of Operations) had to say about it back then.

We originally started drilling the return holes to help return the oil on a road race engine. In the early days of Motorola cup we had to use the stock oil-pan in a Corvette. We were doing everything possible to keep the pickup covered with oil.
Currently this is our standard practice on Gen 3 and 4 engine builds.

Kurt

 

How do you feel about it Jarrod? I remember some debate on the subject of the drainback holes, and both sides seemed to make a good case IIRC. (In case you haven't noticed, I value your opinion, as does Tom )