Tech Updates/Revisions--Alum heads in SS/CS? - Page 2

Jeremy K · 10-28-2016, 02:42 PM

SECTION 11D: MODIFIED STOCK, ENGINE:1, CYLINDER HEADS (Page 16) (10/25/16)
V-8 splayed valve permitted in AS, canted or inline in BS, inline only in CS, and any valve configuration in DS. All heads must be NHRA-accepted, two valves per cylinder, except in classes DS, ES, FS, and GS, four valves per cylinder permitted. Aftermarket aluminum cylinder heads permitted except in CS. Angle milling and/or rolling permitted. Aftermarket iron heads permitted in CS. Porting, polishing permitted; header plates permitted. Exhaust port plates that protrude into port prohibited. Any valve size permitted, valves may be tilted and/or canted. Combustion-chamber modifications permitted. The valve cover rail may be modified. Heads may be cut for larger pushrods and valve springs. External modifications permitted in port area except for
SS/CS. Spark plug holes must be in NHRA-approved location.

I didn't put the important parts in bold in my last post.

SSDiv6 · 10-28-2016, 03:29 PM

The new proposed rule is clear as mud.

It appears that any non-OEM aftermarket aluminum head is allowed.

Also, for SS/CS, my interpretation is that any non-OEM aftermarket iron head is allowed.

They also crossed out the language that prohibits the use of billet heads.

I hope the final rules are more specific because this will open a can of worms!

10-28-2016, 02:42 PM	#11
Jeremy K Junior Member Join Date: Nov 2009 Location: Bridgewater, NS, Canada Posts: 79 Likes: 0 Liked 1 Time in 1 Post	Re: Tech Updates/Revisions--Alum heads in SS/CS? SECTION 11D: MODIFIED STOCK, ENGINE:1, CYLINDER HEADS (Page 16) (10/25/16) V-8 splayed valve permitted in AS, canted or inline in BS, inline only in CS, and any valve configuration in DS. All heads must be NHRA-accepted, two valves per cylinder, except in classes DS, ES, FS, and GS, four valves per cylinder permitted. Aftermarket aluminum cylinder heads permitted except in CS. Angle milling and/or rolling permitted. Aftermarket iron heads permitted in CS. Porting, polishing permitted; header plates permitted. Exhaust port plates that protrude into port prohibited. Any valve size permitted, valves may be tilted and/or canted. Combustion-chamber modifications permitted. The valve cover rail may be modified. Heads may be cut for larger pushrods and valve springs. External modifications permitted in port area except for SS/CS. Spark plug holes must be in NHRA-approved location. I didn't put the important parts in bold in my last post.

10-28-2016, 03:29 PM	#12
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,044 Likes: 712 Liked 1,583 Times in 582 Posts	Re: Tech Updates/Revisions--Alum heads in SS/CS? The new proposed rule is clear as mud. It appears that any non-OEM aftermarket aluminum head is allowed. Also, for SS/CS, my interpretation is that any non-OEM aftermarket iron head is allowed. They also crossed out the language that prohibits the use of billet heads. I hope the final rules are more specific because this will open a can of worms! Last edited by SSDiv6; 10-28-2016 at 03:32 PM.