Intake ports are larger at 2.51" x 2.11" ovalsĮxhaust ports are also larger at2.25" x 1.30" rectangular oval port shapeĪlthough the exhaust ports are larger they share similar architecture with the passenger car castings. Valve sizes are 2.24" intake and 1.72" exhaust. Non adjustable valve train used positive stop shouldered stud with 3/8" fine pitch threads on top.Īll Super Cobra-Jet engines used a solid lifter camshaft. They were non adjustable after that date.Īdj.castings came with pushrod guide plates, sled fulcrums and stamped steel 1.73 to 1 rocker armsĪdjustable valve train used non shouldered rocker studs. Slightly larger thermact-air boss All 3 being used for passenger cars D0VE-A is a less revised version and very similar to theĭ0VE-C's The cylinder heads used from '68 to '71 are interchangeable.ĭ00E-R The fabled Cobra Jet and Super Cobra Jet castings.Ĭombustion chamber volume comes in slightly smaller at 71 to 75 cc's 11 to 1+ compression ratio with 429 flat tops, or with the dished 460 pistons.Ībout 1/2 point lower on '72 and up blocks.Ĭobra Jet engines built before 11-'69 had adjustable valve train. Used beginning with the '70 model year through the end of the '71 model year run. Used beginning with the '69 model year vehicles includes engineering revisions to the '68 casting.ngineering revisions to the '68 casting.ĭ0VE-C Again a revision of the original casting.
Valve sizes are 2.09" intake and 1 65" exhaust.Ĭ9VE-A Basically the same as the '68 unit. Used positive stop shouldered rocker studs and cast iron rail self aligning rocker arms 1.73 to 1 ratio Like all of the BBF castings the exhaust port needs alot of help.
Thermact-air boss is slightly smaller than on newer castings. Thermact-air boss and passages not drilled for 49 states emissions. This assuming factory type pistonsĩ.5 to 1 to 10 to 1 on later blocks with increased deck height. They will give about 10.5 to 1 on pre '72 blocks. These heads have 75 to 77cc combustion chambers. 429 introduced in '68 Thunderbird as the "Thunder jet" 460 introduced into the '68 Lincoln line up
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