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They are no myth. I have run across no less than 3 of them.US vortec headed TBI 96 Vans are a myth. There were TBIs on G30 Vans that year but they had old school 76cc heads and were rated at 180hp.
You can buy intake and exhaust manifolds from GMPP to use vortec heads on a TBI engine, everyone knows this. Stock specs for a 96 G30 van are 8.3 compression ratio with 180hp/295tq. Gm lists this as the heads on them.You must be registered for see images attach
NONE of the TBI engines were 8.3:1. 8.75:1 or 9.3:1. Also these were not the GMPP intake manifolds. I know about those as well. These were the Mexico TBI Vortec intakes that had the EGR blocked off in Mexico. Where do you think the GMPP EGR plug and block off plates came from.
'99 2500 Suburban with the 7.4 4.10 100% stock city 9.5, highway 10.8, towing light load same, towing heavy load 8.3, really heavy load 7.4 or lower
Out of the 400 family, but I graduated up to a '05 Escalade with the AWD 6.0 3.73 100% stock city 15.6, highway 19.8, towing a 4000 lb pop-up camper 13.3
I live in the mountains, so all numbers are with that kind of driving in mind. The one flat trip I took in the Escalade I got around 22 unloaded.