McRat

Obviously, I will need to check clearance, but what is everyone's experience with lift numbers using non-flycut heads, OEM gaskets, stock ratio rockers?

What is "safe"?

HumpinSS

iTrader: (1)

Not so much lift but duration and v.e. (valve events) are the contributing factors. Someone correct me if i am wrong

66ImpalaLT1

Lift is not the problem, its the valve events that determine the clearance.

mikemodano9c

imagine a cam lobe...its like a hill...haha

now it is not soley the highest peak on the hill that is important...its how long the slopes stay high enough to keep a valve open before/after tdc that effects if a valve will hit a piston...

you could have a .625 lift if the cam lobe rised and fell quickly enough so that it didnt keep the valve open around tdc...

look at the trex...is will fit with stock heads and has LOTS of lift and duration...but the lobes rise and fall quickly enough at the right time...

McRat

Good points.

Valve dia probably effects it a lot also.

How much clearance is safe?

mikemodano9c

.08 inch intake...
.1 inch exhaust...

im pretty sure im remembering correctly...

McRat

I guess I'm going to cross my fingers and order tomorrow.
I've never done just a cam, or H/C before. All my experience has been doing complete motors. Just a little worried I might not end up with enough clearance.

mikemodano9c

as long as you use stock gaskets and don't mill the heads you should be fine...

if using stock heads you should be fine...

GTA91

iTrader: (14)

How much can you get away with on milled heads? I'll be running a comp 228 grind with about .560 or .580 lift. All of this on a '98 motor with '98 heads that have been milled a little bit.

mikemodano9c

you should check every cam to be sure, but if your going to run milled heads be SURE to check...