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SSDiv6 · 05-30-2015, 06:58 PM

The subject of rocker arms in Ford blocks has been a debate for many years because different tech folks at NHRA have made different rulings throughout the years.

Many years ago, in the early 1990's, Jim Skelly approved the Crane conversion system shown earlier, for Cleveland and Windsor engines and there were many cars running the conversion.

Also, Mopar Big Blocks were allowed to run adjustable rockers because they were used on the Max Wedge and small blocks were allowed also because the 273 engine.

Some years ago when the rules were changed to allow guide plates and studs, there was not clarification for the use of the original configuration, therefore, many went ahead and followed the rule book and did so.

When the rule book was changed again a few years ago to allow roller rockers, then many racers started to ask NHRA about the configuration. Therefore, NHRA then again, revised the language adding that the engine must maintain its OEM configuration without taking into consideration the previous rule book change prior to the allowance of roller rockers that allowed the use of guide plates and rocker arm studs.

05-30-2015, 06:58 PM	#21
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 2,991 Likes: 693 Liked 1,457 Times in 543 Posts	Re: Rockers for stock Eliminator 5.0 SBF The subject of rocker arms in Ford blocks has been a debate for many years because different tech folks at NHRA have made different rulings throughout the years. Many years ago, in the early 1990's, Jim Skelly approved the Crane conversion system shown earlier, for Cleveland and Windsor engines and there were many cars running the conversion. Also, Mopar Big Blocks were allowed to run adjustable rockers because they were used on the Max Wedge and small blocks were allowed also because the 273 engine. Some years ago when the rules were changed to allow guide plates and studs, there was not clarification for the use of the original configuration, therefore, many went ahead and followed the rule book and did so. When the rule book was changed again a few years ago to allow roller rockers, then many racers started to ask NHRA about the configuration. Therefore, NHRA then again, revised the language adding that the engine must maintain its OEM configuration without taking into consideration the previous rule book change prior to the allowance of roller rockers that allowed the use of guide plates and rocker arm studs.