Cylinder Head Clearancing for High Lift Cams - Page 2 - ZR-1 Net Registry Forums

Hib Halverson · 03-05-2017

What valve spring do you use with those cams?

tpepmeie · 03-05-2017

Depends. On the mass of the valvetrain, rpm, and acceleration rates of the lobe. In my case, I used a Porsche spring (outer only). Phil used PSI I think.

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Hog · 03-06-2017

And this is where one of the advantageous of the DOHC architecture comes into effect, esp. when comnparing an OHV SBC vs. a DOHC Chev engine. The lighter the valvetrain is, the less valve spring is needed, all else equal.

03-05-2017	#11
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Cylinder Head Clearancing for High Lift Cams What valve spring do you use with those cams? __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

03-05-2017	#12
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 812	Re: Cylinder Head Clearancing for High Lift Cams Depends. On the mass of the valvetrain, rpm, and acceleration rates of the lobe. In my case, I used a Porsche spring (outer only). Phil used PSI I think. Sent from my iPhone using ZR-1 Net Registry __________________ Todd ____________________________________ *** our email address has changed! info@pepmeierengines.com pepmeierengines.com Friend us on Facebook too: www.facebook.com/profile.php?id=100011443683384 Pepmeier Engine Development

03-06-2017	#13
Hog Join Date: Jul 2010 Location: Woodstock, Ontario, Canada Posts: 1,275	Re: Cylinder Head Clearancing for High Lift Cams And this is where one of the advantageous of the DOHC architecture comes into effect, esp. when comnparing an OHV SBC vs. a DOHC Chev engine. The lighter the valvetrain is, the less valve spring is needed, all else equal. __________________ peace Paul ZR-1 Net Registry Member #1494