Has anyone made retrofit .921” hydraulic rollers that will work with higher lifts yet? I’m getting paranoid about my cam going flat. Thanks, Frank.

 

Nope, not enough demand. Sorry.

 

On my stock eliminator 307 Olds I turned my hydraulic rollers into short travel solids. My lift is only .474 but I've been 7000 rpm numerous times with no damage, valve float or missing.

 

How much lift can the stocker rollers handle without opening the oil band up? Is the only alternative to bush to .842?

 

For me I can't do .842 because of rules. But if I could I would, I thinks it's a good way to go.

 

What engine do you have?

 

I think Mopar has some larger diameter lifters and might have an option. It's probably cheaper to bore than bush.

 

Mopars are .904. And that’s not the whole issue.

 

I'd bore the lifter bores to .937 and run a solid roller lifter on a hydraulic roller cam.

 

What application uses the .937 lifters.

 

They are a common aftermarket upgrade for numerous engine platforms. Basically, you get a .937 SBC lifter body made with an Olds link bar. You just have to block off the hole in the lifter body that faces the feed hole in the lifter bores.

 

Thanks Chad

 

BAM makes a good .937 with an .850 wheel. He’ll also do just about any mod you want to them.

 

if you are talking about using late .921”
rollers in an early .921” lifter block, the notch above the oil feed hole in the band is exposed even with small base circle cams. There isn’t anything you can do even if you somehow use super high ratio rockers and custom super small base circle cam.

i can’t remember the lobe lift last time I checked where it was exposed..but it was less than .200” I think?

 

Is the oil band location in those sbc lifters in the same location as a typical sbc?

how many holes are in the body ?

 

They are as pictured. Two holes 180 degrees apart.

 

My engine is a 66 400. I think it’s an E block. I would hate to put solid lifters in this car. Trying to keep it undercover stock.

 

ok, its edge orifice metering.

what about the band on the side? That’s what I meant when I asked about the bottom of the oil band…it looks too low for an Olds and would drop below the lifter bore on a small base circle lobe

 

what’s wrong with the .921” hyd flats? You are way further ahead keeping the flats because you can get really aggressive lobes for that diameter

a .921” hyd roller can’t come anywhere near a .921” flat lobe. A .921” solid with a big diameter wheel is a different story though

 

Just trying to avoid the flat tappet blues. I think I’m ok but if the cam is indeed going flat, I’m going to pull the whole damn thing out box it up and send it to Mark. I’ll let him take care of it.

 

ya, good idea…send it to Mark, he’ll fix you up somehow

 

Worked fine on a 425 block I did with a .420 lobe. Same lifters in my 529 RR block just without the hole plugged. That has completely different oiling though.

 

Link to 425 build with above mentioned lifters:


461 Bracket Build - ClassicOldsmobile.com

 

You do know there are many flat tappet cars/engines still running out there ?

 

DING DING DING we got a winner.

 

Yes, I understand that but I’m concerned about MY car. I also appreciate that the big old .921 lifters are going to help the situation. When I drive down the street it sounds like solid lifters. I’m trying to locate the noise now. I doubt if the cam is going flat but if it is I’m not going to put flat tappets back in it when I rebuild it. Thanks.

 

Have you done anything to the engine valve train wise since you bought the car?

 

Yes everything inside is new. Crank, rods, pistons, cam, lifters, valves, springs. Everything. It ran great on the dyno and it still runs good. There is a chance it’s nothing more than noise from the new exhaust. By the way you used to own this car.

 

If you used the Chinese lifters that could very well be the source of the noise.

 

At the time all we could get was Johnson hylifts. I don’t know where they were made.

 

USA. Really the only ones that are.

 

https://toplineauto.com/capabilities/

 

You bought great lifters.

 

Mark got them for me with the Lunati cam.

 

I know I owned it and the engine never had anything done to it other than the tri carb added. That's why I asked if you had done anything to it. IMHO you're worrying way too much about the flat tappets.

 

Fired up another fresh hydro flat tappet engine today. 135 on the seat with 310 over the nose. Pretty fast lobes.

it’ll live a long happy life on the street for many years.

 

I took it apart because it had huge oil leaks. When I got it apart it had 3 cast pistons and 5 forged so someone had been in it. Looked like an Arkansas rebuild!. You are probably right Mike. Haven’t been able to drive it lately because of the rain but I’ll check out the exhaust angle. Thanks everyone for the help.

 

[QUOTE=Fpcopo;1505168]I took it apart because it had huge oil leaks. When I got it apart it had 3 cast pistons and 5 forged so someone had been in it. Looked like an Arkansas rebuild!. You are probably right Mike. Haven’t been able to drive it lately because of the rain but I’ll check out the exhaust angle. Thanks everyone for the help.[/QUOTE

jesus, the lifters are the least of your worries.

 

The block and heads were in really nice shape. It made 460 hp @ 5400 and almost 500 torque @ 3900. This was thru stock exhaust manifolds and headpipes with an air fuel of 10.5/1. If I had been able to lean it I’m sure it would have made 470 hp.

 

How many cubic inches ? What block ?