[Nicks67GTO]

Originally Posted by Tim Corcoran

A valve lifter has internal metering and each lifter has a different metering rate. Some solid lifters because of their specific metering may require restrictors in the lifter bores or restrictor pushrods. The "cool face" style lifters with the oiling hole of .015" is so small it could not change your oil pressure. If you experienced low oil pressure and replaced the lifters and the pressure went up I don't think it was due to that very small oiling hole. It may have been due to the different metering rate of the lifter or maybe another change was made at the same time you changed lifters.

I can only speak from my expierence. I have no idea why the oil pressure issue went away. The only thing changed were the lifters that time. They were Howard lifters on a Howard cam grind 302/312, 268/278@.050. .572/.572/108 cam in a high winding 11:1 350. Spring pressure was set at around 140lbs seat and about 350lbs open on the Brodix heads if I remember correctly. Maybe they were junk lifters from the get go?

[Nicks67GTO]

Originally Posted by gtofreek

They were designed more for applications where springs pressures are high and on the verge of wiping out the lobes. The 100,000 mile engines your buddy mentions have slow, wimpy lobes that need no spring pressure, so they live a long happy life. Not the case with today's aggressive lobes.

What spring pressure would be considered close to wiping lobes on a SFT cam?

[gtofreek]

Originally Posted by Nicks67GTO

What spring pressure would be considered close to wiping lobes on a SFT cam?

Over 400 LBS. open pressure. Personally, I believe it has more to do with spring rate, than actual pressures. I spring solid flat tappets[depending on their duration at .050" and advertised duration] between 140-170 lbs. on the seat and 350-400 lbs. open. The closer the duration at .050" is to the advertised duration, the faster the lobe accelerates the valve, and the more spring pressure it needs.

Now, if you look at a Dodge slant six, they had solid flat tappet cams in them, but they were so mild that they get away with very low spring pressures. Something like 60-70 lbs. on the seat and maybe 200 lbs. open. They would run forever with that.

[HWYSTR455]

Originally Posted by Tim Corcoran

The best flat tappet lifters hydraulic or solid are the Hy-Lift Johnson lifters made in the USA with material made in the USA. Hy-Lift Johnson also has solid lifters with the EDM oil hole in them. I have these lifters and at the best price too.

Dang Tim, if I would have known that 2 weeks ago I would have bought a set from you for the clone.

http://forums.maxperformanceinc.com/...d.php?t=733233

Wouldn't happen to know if they have the disc type check valve or a check ball would you? And the metering valve disc, is it with the 4 holes?

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[HWYSTR455]

Originally Posted by oville

..
Now just have to figure out the cam profile!
462 e-head, dual plane intake, 3k stall & 3.50 gear, street strip use, any suggestions on that one?

Think the 60310 would do you right, and your gear should soften it off the line a touch, help prevent wheelspin some. Some.

Could even go 60311, it will run power brakes, but it's a little more 'cranky', if you can handle that. This one will be more sensitive to static CR, with e-heads, I would say min is like 10.5, 10.75-11 would be better.

Might be better with a custom grind, filling out the form as Singleton suggested isn't a bad idea, then call after you get a response to discuss, they may mod it some after talking to you.

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