68 ford thunderbird 4299/12/2023 ![]() ![]() 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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