89blues

iTrader: (1)

I would like to get a set of 180cc heads and there are a lot to choose from out there. But what about us L98 guys that have roller tappets, we need different springs right?

How do I know what are the correct spring pressures for my application? Does one just buy a bare set of heads that say up to 1986 years only and install higher pressure springs for a roller application?

I'm really trying to figure out what the best method is here.

Thanks!

Orr89RocZ

iTrader: (20)

Stock rollers look for single spring heads with around 100-115 lbs seat pressure and 300 open. That should hold stock cams

Mild performance cams, double springs around 120-135 lbs seat pressure typically work with 320-350 lbs open pressure.

Aggressive lobe rollers, may want double springs in the 145-155 seat range, 360-400 open.

Heavy valve race setups or very agressive race lobe forced induction cars turning ultra high rpm, 175-200 lbs seat, 450-500 open, and aftermarket lifters that can handle the loads like Morels

These are rough guidelines. Rpms, valvetrain mass, pushrod size/type, etc need to be reviewed.

89blues

iTrader: (1)

Orr89 you're the man, always the first to come through with helpful information!


As far as spring diameter stock is like 1.25 isn't it?

rusty vango

I would like to add this, stock roller lifters do not like really strong springs. they tend to self destruct when you go big.