HI ADAM : I can help you with the Alt bracket , but not the manifold ( I have 230 / 250 manifold , but not 292 ) -- Can't get to the brackets right now , due to the snow -- LATER -- DON / Fleet 51
HI WARREN : Never talked to TOM , but I was told the 292 has a larger I D -- TRUE ?? UP-DATE !!! Just consulted my " BIBLE " -- the ( now famous ) " Chevrolet Inline Six-Cylinder Power Manual , by Leo Santucci .
QUOTE : The '69 and later HD-TD ( Tall Deck , 292 ) manifold is a straight forward cast iron affair , with some incorporating a heat riser valve below the attachment to the intake plenum. It's shape tends to mimic the 194 /250 LD ( Low deck ) manifolds , with most having a center exhaust exit .Earlier HD-TD manifolds ('63 -'68 ) are more streamlined and have no heat riser . Their rear exhaust exit tends to interfere with the clutch linkage on some trucks .
HOWEVER , this manifold does feature larger passages and incorporates a significantly larger exhaust head-pipe ( 2 1/2 inches ) and features a 3 bolt flange , where the Low Deck ( 250 ) manifolds have a 2 bolt flange .
Hope this sheds a little light on the subject , and proves helpful -- I built my motor ( 250 ) right out of that manual and I am very pleased with the results -- LATER -- DON / Fleet 51
