Sucking fans are more efficient than pusher fans; since 292's and their brothers are longer than 235's, etc., in Chevy's, ( GMC do not have this problem) it would be a good idea to move the radiator forward slightly in the core support to be able to use an original fan, give more room for accessories. For additional heat capacity, use a fan shroud, with a rolled edge around the fan, fan blades should be centered in shroud. Holes in shroud should have flaps of some heavy material to open when road air pushes them open-see-VW Rabbit, etc.

Neoprene mount material is readily available in 1" thick by 4" wide by length as snowplow blade material; Florida residents will have to look elsewhere.

Ed.

Last edited by EdPruss; 06/02/2018 12:59 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.