Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Dean, IF car does not have the fan and fanshroud installed, you prob won't notice an issue.
On 3 separate occasions have ran into this exact deal/ 400 or 455 with long tail T400's that prev owner had rigged into a '69-72 Pontiac 2 door A-body (112" wheelbase). All were factory AC cars and had relatively good condition radiator core support bushings. One actually had new repro core support bushings. With the trans crossmember slid back & the bigcar long tail T400 installed, what it does is raise the rear of engine slightly in respect to the angle it originally would have with the correct length short tail auto trans (or a Muncie or 3spd manual). This in turn tilts the engine forward down in the front slightly and the 19 1/2" diam 7 blade fan gets into the lip of the bottom of the shroud. This condition is worsened today, by the inferior parts store trans mounts that are coming from overseas, they are slightly taller (thicker) and contribute slightly to the rise in the rear. Also, many higher mile or heavier engine/high torqued frames have experienced frame cradle sag. Frame cradle sag is very common on early A-body frames and causes the entire engine to set lower.