momofx

Anyone using the Morel 7717 lifters? What preload did you use? I'm using an iron block (lsx) with ls3 aluminum heads (821). I've read where people said .060, .040, .035, etc. So not sure lol

Wild guess is I'm around 45 to 50 with the iron block & aluminum heads combo...idk

01CamaroSSTx

iTrader: (3)

https://johncalliesinc.com/pdf/Adjus...licLifters.pdf

Che70velle

iTrader: (6)

The 7717’s were previously the 6504’s. Not exactly sure why Morel changed the numbers and I won’t type heresay or rumors. The lifters have .120” of plunger travel. You’ll likely find preload info under the previous 6504 part number. Morel changed the number earlier this year if I remember right.

01CamaroSSTx

iTrader: (3)

Found this!

https://www.tickperformance.com/more...l-lsx-engines/

G Atsma

Good find! Looks like they quit polishing the body, hence the number change.

momofx

You are correct. I was digging for a while and found out that the pn changed because they are not polished anymore but have better internals than the 6504s....interesting.

Im thinking to go with about 40 since I have an iron block and aluminum heads...

Summitracing

Btw, as a heads up, we now offer the Morell 7717 as our part number SUM-HT217-16 lifter

G Atsma

Nice bit of insider info! Not mentioned on your site, but no biggie. Summit is selling QUALITY...

canadarob

Could you tell us if there is any changes internally on the lifter from the morel 6504's to 7717's?

Summitracing

Morel doesn't share specifics on the internals of these. We would expect the same good quality and performance from the 7717's as the 6504's.

canadarob

Thanks,

What I was getting at is, if replacing a 6504 lifter with a 7717 no change in pushrod length will be required, correct?

momofx

I'd check the lash anyways just to be sure and a peace of mind

Summitracing

Yes, if replacing a 6504 lifter with a 7717 you would be able to use the same pushrod. Like momofx said, it's a good idea to check lash to make sure everything is good to go. That's a good engine-building practice peace of mind kind of thing.