Question for Brent Barry or Blair

[Royce]

Could you shoot me a recommendation for a spring for this Comp HR grind. 23562R/23564R. 2.19 intake 1,7 ex. 3/8 stem. Max rpm 5500. Stock rockers with end stands

RB

[blykins]

325/252 with .356” lobe lift, really lazy lobe but your valvetrain is heavy.

Not looking at displacement or cylinder head flow, but focusing on the above with a 5500 rpm peak, I’d be at about 160-165 seat and 370-380 open.

[Royce]

Thanks Brent.. This is a 525 inch torque motor, with a less than robust valve train, hence the lazy lobe.  I wanted to get by with as little spring as possible to ease the strain on the rocker shafts.

[blykins]

I figured it was a large engine.

A small OD dual spring (1.25-1.3) or a beehive/conical will be your friend.

Those spring pressures are perfectly fine for stock rockers and end stands.

FWIW, you could have ran a lot more aggressive camshaft and still would have been safe.

[CaptCobrajet]

Comp 26120 beehive.  Probably should go in at 1.890 to 1.900 with what you describe.

[Barry_R]

Don't think you even need that much on the seat, but you might want a little more open.  The 5500 number should be an easy target with almost any decent dual spring, but I would also vote for the beehive/conical deal - took me a while to get comfortable with the idea of a single spring, but they do seem to work well in this sort of application.  Just be aware that on a hydraulic roller, once you loose valvetrain control it often "poops the sheets" pretty hard - - it'll be perfect at 5800 and crashing off 40 pounds of torque at 5900.  If you hear the exhaust note change at a certain RPM - stay below that number.  Or add pressure/reduce weight (titanium or tool steel retainers).

[Royce]

Thanks guys  that is the info I needed...