2011 4.6 3 valve Ford Ok'd for stock

[Ed Wright]

Originally Posted by GUMP

The 275 HP for my Firebird was dead honest. The problem is that the HP numbers in the book are factors not HP numbers.

The cylinder head work they can hide in the aluminium LT1 heads is a big factor there. Hang one out of the GM crate, or out of a car, on an engine dyno, they won't make anywhere near their stock hp factor. Thatr's the big reason the S & SS factors are so different. The SS heads aren't all that much better than a good set of Stock Eliminator heads. Put a set of actual stock castings on a good running LT1 Stocker and see how fast it is now.