99 Black Bird T/A

iTrader: (4)

Fastest Ramp & Highest Spring Pressure for Stock Lifters?

When do you need to say when with the stock lifters?

How much spring pressure?

Fastest ramp rate? XE, TR, MMS, XE-R, or mild Solid etc?

Is the 215 solid roller based intake lobe on a TR Old Man cam too much for stock lifters?

Is a 230 XE-R too much?

Is a 236 XE-R too much?

Oil weight ie 5w-30 vs 10w-30 vs 10w-40 have any effect on lifter collaspe?

I need help with this as my Camaro's engine is coming apart and I can upgrade to what's needed. The MAX cam I'd ever consider is a TSP 231/236 but a MMS229v2.1 is probably what I'll go with.

Thanks

wrencher

iTrader: (2)

I'll make it simple, if you pull the heads replace the lifters.
To much to risk not to replace them.

99 Black Bird T/A

iTrader: (4)

Wrencher,

It's not quite that simple of a question.

At what point are the stock lifters beyond their limits?

Doesn't matter if they are used stock or new stock ones, if they can't handle an XE-R lobe and 300 pounds of spring pressure.

wrencher

iTrader: (2)

If I were to replace lifters I wouldn't use stockers.
I've seen some with 580 lift cams w/stockers & there not a quiet valvetrain.
I would go comp R's or crane's.
I dont think you question has a cut & dry answer like a valve springs limitations do.

99 Black Bird T/A

iTrader: (4)

Your probably right no cut & dry answer...my valve train is noisy..but seems ok...lifters aren't collasping etc...it was checked.

However, I may go with bigger XE-R ish cam on my new project and I don't want over do it on cam selection for the stock lifter.

Anyone else care to chime in?

LIL SS

iTrader: (9)

I'm running a TR236 with out any issues so far. About 1500-2000 miles on the cam. Stock heads and other internals. I spun it to 7k a couple times on the dyno and have my shift light set at 6500.

236/230 .599/.573 112

SNW Vette

Here is some info from old threads. Steve
Max Seat Pressure for Stock Lifters
Lou at LG said:
"Comp 987s are the MAX (almost too much) spring you want to run on stock lifters. Anything above that (ex: Comp 977) WILL need a high performance (ex: Comp R) lifter."

"987s have a 130lb closed seat pressure and a 325 open pressure.
150 with 1.7s and 140 with 1.8s will tend to bleed down one or more of the lifters resulting in a lot of individual lifter noise. I’ve done a lot of testing with too-stiff K-motion spring. Chris"