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thunder jet can be had many different ways,first all k code 429 r thunder jets, but r 2v engines this is the only diff,some times called base 429's,yes base.........t jet 429 can be a 68.69.70.71year, they have screw in studs,no guide plates,they made these engines sometimes w/ dove blocks,and sometimes c9ve blocks,the 4v intake is just that ,a plain 4 v, 4 v is rated at 360 hp,if ur lucky its a dove block,at least a 2 bolt the heads r worth about 250.oo block as much as 400.00depending on what it is...the crank will be a 4u, worth about nothing unless some one wants a 429 crank, dont forget to mach the heads for guide plates.a lot of poeple just bolt on adj studs,and guides plates,u caint do this and have the right valve train gemotry (pushrod lenght also) ....................
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c9ae-zx
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