SBF Cylinder Head Footnotes

As with all aftermarket heads, your factory self aligning rockers might no longer provide the reliability required.

Due to many available factory OEM style/variations your existing stud girdle may not fit.

As with all aftermarket heads with 1.550 O.D. springs, head bolt, or studs with smaller diameter head might be required for easier installation. As with all aftermarket SB Chevy or Ford heads with 1.625 O.D. springs might require the spring to be removed to install the head.

Valve Springs: AFR springs that come standard with our assembled packages are very high quality and are sufficient for most applications. However, forced induction applications and cams with aggressive ramp rates (some cam manufacturers now offer much faster ramp designs and more aggressive cam profiles) may require additional spring pressure. We offer optional valve springs for these types of applications. AFR also recommends the use of billet cam cores which tolerate higher spring loads. Please don't hesitate to contact us directly if you question which spring is more ideally suited to your application.

AFR assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). We recommend a minimum depth of .080 on the intake valve and .100 on the exhaust with a radial clearance of .200 minimum around the perimeter of each valve. Clay is recommended to visually verify both depth as well as radial clearance. Just checking depth is not enough...the position of the valve pocket must also be addressed.

Please see footnotes and the specific product page your researching for specific variences from OEM heads.

Air Flow Research | 28611 W. Industry Drive | Valencia, CA 91355 | 661-257-8124