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PKRWUD · 12-16-2002, 02:27 PM

The 5.0 HO first came out in the 1982 Mustangs. In 1985, they started using roller cams and "factory headers". In 1986 they stopped using carbs, and went to speed density SEFI. Also, from 1986 on, all 5.0's installed in passenger cars used the exact same block as the HO. While the HO's came with a roller cam, most of the others came with a flat cam, but could accept a roller cam. In 1988, the Mustangs sold in California switched from speed density to Mass Air. In 1989, all of the Mustangs had Mass Air. Also, the truck 5.0's all used the same block now too, meaning that even though they came with a flat cam, they would accept a roller cam. In 1993, they switched from forged pistons to hypereutectic (sp?) pistons.

All of the 5.0 HO's, as mentioned, used the 351W firing order.

Take care,
~Chris

12-16-2002, 02:27 PM	#9
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	The 5.0 HO first came out in the 1982 Mustangs. In 1985, they started using roller cams and "factory headers". In 1986 they stopped using carbs, and went to speed density SEFI. Also, from 1986 on, all 5.0's installed in passenger cars used the exact same block as the HO. While the HO's came with a roller cam, most of the others came with a flat cam, but could accept a roller cam. In 1988, the Mustangs sold in California switched from speed density to Mass Air. In 1989, all of the Mustangs had Mass Air. Also, the truck 5.0's all used the same block now too, meaning that even though they came with a flat cam, they would accept a roller cam. In 1993, they switched from forged pistons to hypereutectic (sp?) pistons. All of the 5.0 HO's, as mentioned, used the 351W firing order. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!