Quote:
Originally Posted by SCOTI
As another guy that has 20yrs experience w/vehicles.... the shroud is there for safety AND helping route/pull air through a radiator @ low/no speed. If you sit in traffic a lot, the shroud is much more important vs. @ 75mph cruise.
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Aww C'mon. There's no bumper to bumper traffic in Sacramento...
Getting serious again. Undercooling at low speed is the reason you fab a shroud for electric fans and you don't discard the shroud for mechanical fans.
Adding wings between the radiator and the rad support to direct air intake from outside the engine bay keeps you from short circuiting the airflow and overheating the engine when you actually have enough airflow.
Around 2005 or so GM added PCM controlled electric fans to the lower displacement 1/2 ton rigs. Not sure if the earlier PCMs can be programmed to add this feature or not.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
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