2015 Rules

[Rich67stang]

Originally Posted by SSDiv6

Yep, it is a great move for making the GM products go faster since it will make legal the use of the Chevy LS cast iron and aftermarket 11, 15 and 18 degree cylinder heads!

The Ford N351 cylinder head cannot compete against the GM offerings.

After reading your post, maybe I was being a little narrow minded, I just assumed the aftermarket casting would have to be based off of OEM parts. The LS cast iron was not legal before this rule change? As for N351 not competing...Mr. Perno Must have made the Chevy guys nervous...lol.