[Mr427]

Guys: This engine was placed on the table for NASCAR officials sometime in late 1969 or early 1970. It says F-O-R-D on the valve covers. Bill France killed it like they did with the SOHC. It, like the SOHC was a true Hemi engine.

The "S" version of the Boss 429 is the basis for the NASCAR version, with the 2.37" intake valves and connecting rod bolts that are the same size as the lugs on your car .....1/2 inch.

The "T" version was the "street" version with smaller valves and lighter rods and pistons. If you own a 1969-70 Boss429, chances are you have this version in it. The only external clue is the engine ID plate under the coil where you would find 820S or -T. It is a very different engine and then there was the full house NASCAR engine which was another step up yet in parts and performance. Ford never meant for any of these motors or the technology behind them to get into OUR hands.

It took twenty long years for even the most avid supporters of the brand to convince the high brass at FoMoCo that this actually was good business.