Cam vs lifter question

James L Miller · 02-07-2017, 01:02 AM

SECTION
10A
:
STOCK, ENGINE:
1, CAMSHAFT/LIFTERS (Page 2)
(12/5/2016)
(1/12/2017)
Camshaft must retain stock lift for horsepower claimed per NHRA Technical
Bulletins. Front wheel drive vehicles and stock trucks, maximum lift is limited to
.430 inch or OEM, whichever is greater. Aftermarket OEM type replacement
lifters permitted. Solid lifter may replace hydraulic. Flat tappet may not be
replaced with roller. Lift checked at valve retainer, with zero lash. Hydraulic lifter
cam will be checked with pushrod and rocker as run, plus solid lifter, at zero lash.
Plunger height of checking lifter will match extended height (no preload) of
hydraulic lifter. Hydraulic lifter may not be plugged or bottomed. Aftermarket gear
drives/belts prohibited. Aftermarket timing covers permitted as long as OEM
type timing gears are used. Adjustable pushrods or adjustable OEM rocker arms (not
both) permitted; must be same or greater weight as stock. Pushrod guide plates
permitted. Cylinder head may be clearanced for larger diameter pushrods.

02-07-2017, 01:02 AM	#9
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	Re: Cam vs lifter question SECTION 10A : STOCK, ENGINE: 1, CAMSHAFT/LIFTERS (Page 2) (12/5/2016) (1/12/2017) Camshaft must retain stock lift for horsepower claimed per NHRA Technical Bulletins. Front wheel drive vehicles and stock trucks, maximum lift is limited to .430 inch or OEM, whichever is greater. Aftermarket OEM type replacement lifters permitted. Solid lifter may replace hydraulic. Flat tappet may not be replaced with roller. Lift checked at valve retainer, with zero lash. Hydraulic lifter cam will be checked with pushrod and rocker as run, plus solid lifter, at zero lash. Plunger height of checking lifter will match extended height (no preload) of hydraulic lifter. Hydraulic lifter may not be plugged or bottomed. Aftermarket gear drives/belts prohibited. Aftermarket timing covers permitted as long as OEM type timing gears are used. Adjustable pushrods or adjustable OEM rocker arms (not both) permitted; must be same or greater weight as stock. Pushrod guide plates permitted. Cylinder head may be clearanced for larger diameter pushrods. __________________ Mopar 2 Ya!