Technical isky f8502 adjustable lifters

isky f8502 adjustable lifters for flatheads good or bad?? Any problem with them??

 

They are heavy compered to the stock. I would rather choose the Johnson style (hollow). I think Red's Headers have them;
http://reds-headers.net/index.php?main_page=product_info&cPath=4&products_id=6

K

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Taildragger&fenderless

 

I realize they are solid and heavier but I wonder about how dependable they are compared to others. Thanks Bill

 

If you understand what the lifter actually does they should be as dependable as an anvil. I guess I don't understand your reference to "dependable". It's a tubular shaped iron object that moves up and down in a bore. How simple (dependable) can it get?

Frank

 

a lot of lifters nowadays have screws that come loose and soft faces that were out way to fast and destroy good cams.

 

I used a set in my last stroker build they seemed fine. I ran them with a cam that was a strong low/mid range cam. Not a high revving cam, so the weight wasn't going to be as much of a factor. I don't have the car anymore so I cant say much on how long they last or durability.

 

Looking at using them in a 304 cu in flathead with a Potvin 425 cam. 80# seat pressure.

 

Then the Isky ones are way too heavy! Red's or get some NOS Johnson's

K

.................................
Taildragger&fenderless

 

My brother bought a set for his flathead. All I can say about them is they are extremely hard to turn the adjustment screw. We had to put them between 2 pieces of wood and put them in the vice to get them free.

 

Tight screw is great. The last 4 sets of hollows I used I had to distress the threads to get them to hold.

 

Not as tight as these were. We seriously thought we were going to destroy them.

 

Bought a set on Ebay about 10 yrs ago that were new. I have been running them on a reground can with radical lift with no problems. I run the snot out of it. I'm not racing,so weight was not a factor

 

Too heavy, use stock lifters

 

Well the question was on reliability of the Isky lifters. I don't use stock lifters as I do not have patience to be doing the end grinding to fit them. I prefer the adjustables for ease of install. I have been using the hollow adjustables a lot. Mostly from Reds Headers. Maybe it is just me but I find to many where I have to distress the threads to have a tight screw. Maybe most of these are tight enough and I am after more than necessary. I don't know. Most of the motors I build are the close to stock variety, low rpm etc. These I use the solid lifters. On reflection I will use a set of Hollow on this 304. The initial reason for this post is I was offered 10 sets of the Isky, new in box for a pretty good price. I did buy them and they should last me a while as the higher end engines I will continue to order the hollows. Thanks for all the replies, even the off topic ones were appreciated. Bill

 

The heavy ones would need alot of spring pressure to follow the radical shape of the eliminator cam.
Why not choose a less radical cam?
If you want to use the 425 , do it right.......

 

80# with the hollows. Cam is already installed.

 

Sent you a PM
Also, you will like the 425. Great cam and much more streetable than I was led to believe
Jim

 

Jep!
Best flat tappet cam ever made!
But the design of the lobes is not very lifter friendly , so you need quite some
Spring pressure to the lifter on the lobe all the time.
Even at 5-6k rpm.......

That is why i used and use stock lifters .....half the weight of the hollow adustibles

And i have #90 on the seat with stock lifters.

No lifter bouncing at 6k