Inliners International Forums General Discussion Engines Springs for 235 and 261 Engines

You also need to pay attention to the intake lobe center line...The intake closing has the biggest effect on engine performance...
On the last 261 I built ,455 Buick springs worked out nicely with after marker retainers and went right in at the correct installed height. Of course this depends on the location of the valve seats.You need to measure a mock up of the valve retainer and locks and compare the measurements to what's available. The Buick springs were about 90 lbs on the seat and 220 open..