[Kauai Hawaii]

Trying to figure out the difference between the 302 and the 302 HIPO. can anyone fill me in on the scoops. I've heard that the HP varies, but is it due to different internal parts, efi, carberation?

Aloha, James

[59 wagon man]

Different Firing Order ,intakes ,cams Just To Name A Few

[Kampr]

I don't think there is such a thing as a 302 HIPO unless you want to call a Boss 302 a HIPO. Some people call the 68 302 4 bbl J code engine a HIPO but it really isn't. It had a higher compression than the 2 bbl engine and more hp though.

It sounds like 59 wagon man is referring to a 5.0 but as far as I know none of them were called a HIPO either.

[jaslong]

i think what he is referring to is the 5.0. H.O motor that was in the mustangs and some thunderbirds it does use i believe use the 351W firing order and had more power then the reg 302.

[mr.Pinto]

The 5.0 HO used the 351 firing order and uses a roller cam. Not sure of the hp difference between the two.

[jimfulco]

The EFI 302/5.0 in the '87-'92 Crown Victoria and '86-'88 T-bird had heads and camshaft designed for fuel economy and maximum torque at low rpm, while the 5.0 HO engines found in Mustangs and later T-birds had heads and cam designed to make more horsepower, but making torque peak at higher rpm.

My '88 T-bird, with single main catalyst but dual mufflers, was rated 155hp at ~3200rpm, and 275lb-ft at 2000rpm. Single-muffler versions were 150hp. The '86 Mustang HO engine had the same heads, but a bigger cam & a true dual exhaust system, and had 200hp at a good bit higher rpm. I don't know the torque rating, but I imagine it went up considerably with the twice-pipes. '87-up Mustang HO's got basically the same cam as the '86, but with new heads that bumped hp up to 225, with 300lb-ft at ~3200rpm. Ratings are all "net", as installed in the vehicle.

Freeing up the exhaust on mine (gutting the catalysts after the bricks broke into chunks) made a big difference in torque and power, allowing the engine to make power for another 500rpm before running out of breath.

Most HO motors got forged pistons, while LO units got cast. I think it was the '93 HO's that also got cast pistons for some reason.

[TANGO]

The only other 302 That may at Times be called a Hi-Po 302 But is not . Is The 1968 J-Code 4V 302 . It was used in the 1968 Shelby GT-350's . It was rated at 250 H.P and Had 10.5.1 C/R .