[er455]

Does anybody know what part # for a set of Crower. Hippo solid roller lifters to get for a GM 455 block ?? Butlers site has different ones and they all say for aftermarket blocks and they state you need restrictor pushrods ? Then they also have some with an offset , so I am confused on which one to get . I tried to call but got tired of being on hold . Thanks

[steve25]

I think There called Hippo lifters because they are .903” in OD to fit aftermarket blocks that have been enlarged to that size.
Factory blocks use lifters .842” in OD and can not be enlarged to .903”.

[Jay S]

Standard .842” Full bodied w/pin oiling is the Crower 66260H

Or 66294H is the Cut away (light weight) /pin oiling and needle bearings. The 66294H is really not needed on a hybrid cam profile, but won’t hurt either. IRC they are rated for a little higher pressures.

FWIW..Crowers have restricted internal oiling. They work fine without oil restrictors.

[Steve C.]

HIPPO stands for Hi-Pressure Pin Oiler.

It is an option on the Pontiac solid roller lifter p/n 66260

https://www.crower.com/roller-lifter...mobile-v8.html

See note regarding the option on page 4 here:

https://www.crower.com/media/pdf/RollerLifterGuide.pdf

As Jay has indicated there is a "H" after the part number for the option.

.

[er455]

Originally Posted by er455

Does anybody know what part # for a set of Crower. Hippo solid roller lifters to get for a GM 455 block ?? Butlers site has different ones and they all say for aftermarket blocks and they state you need restrictor pushrods ? Then they also have some with an offset , so I am confused on which one to get . I tried to call but got tired of being on hold . Thanks

Thanks guys , does $595.00 for a set of 16 sound about right ?

[er455]

Also would I have to change pushrod length if I am going from hydraulic lifters to solid lifters ?

[grandam1979]

66294H Crower is a good choice.

[Steve C.]

Butlers pricing:

https://butlerperformance.com/i-3164...59;brand:99941

I suggest you shop around.

Also if interested for an additional charge Crower can custom make the lifter with two holes that feed oil to the needle bearings. One located on each side of the axle. This is just a fwiw, I'm not suggesting it is necessary. Untold numbers of these lifters have been in use with one hole over the years.

.

[tom s]

You will need solid roller springs!Tom

[Steve C.]

Crower with HIPPO option

https://www.crower.com/roller-lifter...in-oiling.html


.

[pastry_chef]

Haven't seen these mentioned here
https://bamrollerlifters.business.site/

Are 100% USA made.
Jones Cams sells them as his brand.

Lots of great feedback.
https://www.speed-talk.com/forum/vie...hp?f=1&t=45493

https://www.yellowbullet.com/threads...2550529/page-2

Nick Ferri is also a dealer.

[Formula8]

I went from a Crower Solid flat tappet to my current hybrid with solid Crower HIPPO lifters and the pushrods I used with the solid flat tappet ended up giving me a perfect pattern on the valve tip with the rollers as well. I can't speak for the hydraulic flat tappet application.

[chuckies76ta]

Originally Posted by er455

Also would I have to change pushrod length if I am going from hydraulic lifters to solid lifters ?

You won't know if the pushrods are correct length until you check for proper pattern on valve stem. You'll have to install the Crower solid lifters and measure for proper push rod length. Also make sure to check for any interference with the rocker to the spring retainers. We don't run restricted pushrods or restrictors in the block here.

As Tom mentioned springs come into question next. There is lots of opinions on spring pressures when using solid roller lifters versus Hydraulic roller lifters on hybrid setup. Were using the Crane springs 99893 with around 160 closed and around 400 open. Also the lash has to be set around .003 to.005. I set mine at .005 cold and have had no issues to date.

[Steve C.]

"As Tom mentioned springs come into question next. There is lots of opinions on spring pressures when using solid roller lifters versus Hydraulic roller lifters on hybrid setup. Were using the Crane springs 99893 with around 160 closed and around 400 open. Also the lash has to be set around .003 to.005. I set mine at .005 cold and have had no issues to date."

X2

Side note- the Crane 99893 was a popular choice by Dave Bisschop and others. But if memory serves me right there could be an issue with availability with that spring. Another spring that is used is the Comp 26925. Although much will depend on the actual verified installed height. And one should test new springs at that verified installed height with their retainers to check the amount of actual pressure... never trust catalog numbers !

.

[Formula8]

I told Dave at SD what I cam/set up I was considering and he installed a set of 99893's @ 1.80 IH in my KREs which calculates out to something like 140-145 closed and about 380 open. I ran that set up on my 455 and had no issues with the lower spring pressure. For the 433, I had the heads milled and based on recommendations here upgraded to Crower's 68380X2 spring which gives me 180 closed and 460 open at 1.83 IH.

I have noticed absolutely zero performance difference between the two springs so I hope the lifters live longer with the increased spring pressure. At this point, my .080 wall pushrods are the weak link. I am currently running .005 cold lash as well.

[Steve C.]

Here, a good reason why new springs should be tested rather than rely on catalog published numbers...

The old Crower catalog rated the 68380X2 spring at 171 lbs @ 1.800".
At that time the rep at Crower said they would be closer to 197 lbs @1.800".
I know of one new set of those springs that were tested with their intended retainers in place at 1.800" and at least one was 210 lbs.

Also keep in mind springs will lose pressure with use. I've mentioned this before regarding a loss, personally I've seen as much as 14 pounds on the seat after a dyno session. I know of one build where the valve springs were set up for a hyd flat tappet application with an initial setting of 130 lbs on the seat, knowing they would lose pressure with run in. The actual pressure after a day on the dyno was 122 pounds.


.

[Formula8]

Agreed but you have to start somewhere and I seem to recall someone on here saying there is no downside to the increased spring pressure within this range

The Crower springs are visibly more brawny and are much closer to coil bind at this IH with my cam. If I overshot the pressure recommendation folks were making on this forum, I know they will decrease pressure pretty rapidly and a spring like this does not have a 50,000 mile life expectancy.

They are staying for now as they were bought and I don't see a problem with them. Updating the pushrods would probably cost less and certainly would be less hassle than increasing the IH or swapping to a lower pressure spring.

[er455]

Thanks guys going to try to bottom out my hydraulic lifters then adjust them up 1/2 turn to see if it quiets up …

[tom s]

Comp told me and supplied springs to have 200 on the seats.Engineers do things for a reason.Tom

[Jay S]

Spring rate on a hybrid should be about the same as the HR lifters. Seat pressure is increased to control the valves extra acceleration as the lash is taken out. The more the lash on a hybrid, the more seat pressure is needed to control the valves.

There isn’t really a blanket answer for spring rate and seat pressure for all profiles switching to a hybrid. If you have those lighter bams Or 66494h Crowers as a hybrid and it works out that you can run zero lash or pressure lashed cold you could gain quite a few rpms over a HR lifter with the exact same spring package. If the hot lash is getting up into were the cam has a lot of acceleration it will take some extra seat pressure to control the extra valve terrain acceleration. That could easily be 200 like Tom said.

I don’t know what HR lifters are being used, but the other option is to just get a better set of medium travel HR lifters. Johnson PR

https://butlerperformance.com/i-2445...tegory:1234800