Home | Product & Installation Articles | COMP Cams | Speed Secrets: Camshaft Swapping a Boss 302

Speed Secrets: Camshaft Swapping a Boss 302

A legendary small block from Ford, the Boss 302 was originally offered only in 1969-1970 Boss 302 Mustangs and the Mercury Cougar Eliminator. In 2007, Ford started offering an engine using the Boss 302 nameplate as a crate engine. Getting your hands on an authentic Boss 302 might be a bit of a task. However, building a replica Boss 302 could be a very viable option. To explore just how much a modern camshaft profile has to offer these engines, Richard Holdener teamed up with the experts at Comp Cams.

The Boss 302 Replica started out as a 2 bolt 5.0L block with forged 10.5:1 pistons. Factory Boss 302 heads with a 2.19/1.71 valve package, that afford them with an adequate 274 CFM of flow, were installed along with stock stamped steel rockers. Richard even managed to find an original Boss 302 intake manifold. With a healthy, fully assembled Boss 302 replica engine the team is excited to get to installing the new Comp cam and get this Boss making some real power but first things first, Richard needed to start with a baseline. To accomplish this, the 302 Boss is fitted with a 750 CFM carburetor and a pair of 1 7/8 inch long tube headers. Then rushed to the Dyno. After dialing in the air/fuel ratio and timing the Boss 302 made 373 HP @ 6,700 RPM and 324 Lb-Ft of torque @ 4,300 RPM.

With a more than decent baseline from the 302 with a stock camshaft, it’s time for the Comp 282S cam. Increasing the lift to .528, and duration to 236, with a 110 LSA the camshaft is installed along with Comp Cams Poly Locks on the factory rockers. Back on the Dyno the engine produce 406 HP and 342 Lb-Ft of torque. Although, what is really to be appreciated about this cam is that it increased not only the peak power output but also the power output everywhere from 3,000 to 7,000 RPM. It just goes to show the value a modern camshaft profile from Comp Cams has to offer this legendary small block.

Get more tech advice here:

1