Lifter bores are chamfered for smooth installation and operation. They have also been honed for improved oil control.
Heads Up!
Vintage '70 302 two-barrel car castings (D0AE or D0OE castings) 1.94/1.60-inch valves Bronze guides Hardened exhaust valve seats CNC-ported for improvements in airflow MCE advanced port and bowl work by hand GE Glyptal 1201 coating inside Comp Cams 1.7:1 roller rocker arms and guide plates ARP rocker-arm studs Comp Cams one-piece push rodsBumpstick Be-Bop
Comp Cams (PN 35-320-8) grind number FW XE264HR-12 Designed for '82-'95 5.0L with 351W firing order Gross valve lift: 0.544 intake, 0.544-inch exhaust Duration at 0.006-inch: 264 intake, 270 exhaust Valve timing at 0.006-inch: 24 BTDC intake (open), 60 ABDC (closed); 71 BBDC exhaust (open), 19 ATDC (closed) 108-degree intake center angle Duration at 0.050-inch: 212 intake, 218 exhaust Lobe lift: 0.32-inch intake, .032-inch exhaust 112-degree lobe separation with a 43-degree valve overlap Recommended Comp Cams valve springs (PN 986-16)Induction
Marvin goes back to basic high-school physics. Engines are air pumps, he tells us. The power made is directly affected by how much air and fuel we can huff and ignite in the combustion chambers. Induction is the all-important beginning of this process. Marvin opted for the new Edelbrock Performer RPM Air Gap intake manifold, which offers all of the same features as the Performer RPM, as well as getting the manifold runners off the engine for a cooler intake charge. Marvin has also chosen a 750-cfm Holley carburetor with vacuum secondaries fed by a Holley 110-gph fuel pump.
Dimples are adorable, especially when it comes to keeping the intake-manifold end gaskets in place. Marvin goes sparingly on the gasket sealer, letting those dimples do the rest. Dimples provide pressure points, which keep the gaskets in place. | 
The main bearing caps have been dressed and cleaned up. Note the use of Glyptal 1201 to improve drainback and keep iron particles where they belong. | 
Marvin handpicked this off-the-shelf hydraulic roller camshaft from Comp Cams (PN 35-320-8). As you can see, he's dressed it with a dry graphite lubricant that helps reduce friction and eliminate any tendency for scuffing during run-in. |
MCE Builds The Stealth 331
We've already addressed many of the important elements of power: the recipe that is the 331 Stealth small-block from Summit Racing and MCE. We've shown you the block, the reciprocating internals, the cam and valvetrain, the iron Ford heads, the induction package, and the oiling system. Now, we're going to address the many fundamentals of a spot-on engine build.
There really is a difference in pushrods, depending on the kind of platform you want to have for power. According to Marvin, you can opt for the low-buck, three-piece push rod, or step up and sleep better with the more expensive one-piece in the interest of valvetrain integrity. Comp Cams can assist with the choice. The more aggressive the lift, the more you need a one-piece pushrod with a .080-inch wall thickness. | 
Marvin looks to PowerHeads for his performance solutions in a powerful street small-block. In addition, Marvin adds some of his own trickery, rooted in common sense, to make the power. | 
These are vintage '70 302 castings with 56cc chambers, CNC-ported, with 1.94/1.60-inch valves. Marvin goes with a five-angle valve job and works the ports to his own liking. The result is extraordinary airflow. |