A hydraulic roller FE turning 7500 rpm....

[CHANMADD]

Originally Posted by blykins

What you describe was used for decades on solid lifter engines. It uses springs to keep the lifters on the cam.

That's not necessary for a hydraulic cam, unless you have lash in the system or you can't keep the lifters pumped up.

Its called a Rev Kit....it is a set of springs that works under the head and pushes on the top of the lifter. This keeps the lifter in constant contact with the cam ...even in the solid lifter application. As said above that takes the complete lifter weight out of the equation.

[Whodeeny]

Originally Posted by Kit Coyle

Thank you Brent. The lifters are Crane "Vertical Guidebar Roller Tappets"
circa 2006. If the heads have to come off to inspect the lifters then I might
consider putting in new. Or maybe think about a hydraulic cam and lifters at not a heck of a lot more money. Too bad there isn't an easier way to get access
to the lifters in this block, but such is life. I also might mention that this engine
has MPG port plates installed...both intake and exhaust. I don't know how
much difference they make but there is no mid-range flat spot. With such a
light car I wouldn't think there would be anyway. Thanks again, Brent.

I am curious as to why the heads must come off to inspect the lifters on a Boss 302? I had a 351C and the lifters could be inspected without removing the heads.

[blykins]

A Boss 302 block is only an 8.200" deck height. No room because the block is so short.

[Kit Coyle]

Brent...I've read up on the vulnerability of solid roller lifters on this site and
your 351C forum. I'm lucky the Crane lifters have lasted almost 17,000 miles.
Maybe the mild cam and springs coupled with very little idle time has helped.
This is a street only car. It revs to 7000 easily but the HP peak is about 6500
so I usually keep from exceeding 6500. Providence dictates I put new lifters
and push rods in this engine soon. My last question concerns lifter type and
brand. I could replace the Cranes with Crane Ultra Pro for about $750 and
maybe reuse the push rods. Or Crower Severe-Duty "Hippo" @ about $700
plus push rods. Or Isky EZ Roll X bushed @ $1300 plus push rods. I know
the Isky is overkill for my use but they claim 3 to 4 times the life span over
needles. How ambitious is this claim? Crower also has the Enduramax @
about $1050 that is also a bushed lifter. Having you spec a more radical
hydraulic cam to get some more HP for the expense is also a consideration
down the road. Thank you for your time and expertise!

[blykins]

If I were gonna do another solid roller, I'd do something like a Morel pressure fed lifter, for around $750.

I've used the bushed Isky lifter in a couple of engines, but the truth is that hardly anyone drives these things a lot, so it's hard to get good data back on them.

[Whodeeny]

Are there any issues and with using one manufacturers lifter with another manufacturers camshaft? For example Crower mechanical roller lifters with Comp Cams mechanical roller camshaft?

[blykins]

Originally Posted by Whodeeny

Are there any issues and with using one manufacturers lifter with another manufacturers camshaft? For example Crower mechanical roller lifters with Comp Cams mechanical roller camshaft?

Nope.

Any specific thing all these questions are directed at? Are you trying to figure out if you have a ticking time bomb or are you looking for direction?

[Whodeeny]

Brent -
I am wondering if I have a ticking time bomb! And also looking for direction. I am thinking I will run the engine 3K to 4K miles then inspect the lifters. If I can just swap out the lifters to the Crower mechanical roller lifters with bushings rather than needle bearings I would do that. I have a Comp Cams mechanical roller. If possible I would prefer to just change out the lifters. I was influenced to go with mechanical lifters because of comments Jay Brown made in his book on FE intakes.
I do appreciate your inputs to this website and value your experience.
Thanks,
BD

[spdbrake]

I too am in the same thought process /same Comp Cams lifters that Whodeeny has.

I'm considering the Comp Cams Sportsman 96838B-16 Pressure fed axles and bronze bushings instead of rollers. Approx $930 a set. Real selling point for me is the seat height is the same as what I have installed now.
Although that decision may change a few times over the next 3-4 years until I'm ready for a set.