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Unit 5302 · 02-20-2001, 05:27 PM

The Cobra intake will never support more than 400hp. I can't see it happening with heads under 2.02 either.

If you want 450-500hp N/A the only 302 that could do it reliably is the Boss motor. My uncle has a '69 Boss 302, when he had his engine in for assembly in OK the guy actually had another one on the dyno shortly before. The compression was dropped from 11.5:1(or 13:1, can't remember) to 8.5:1 with dished pistons so he could run low octane pump gas. It had the stock cam, '70 heads with the smaller 2.19" intake valves as opposed to 2.21" in '69. It rated at 368hp and 340lb/ft. Stock they were good for 400hp, and with a cam, some port work and tuning they should make 500hp, the 5.0HO will not see 500 N/A without being wigged out beyond belief. The stock block would be very questionable at that hp level as well. I'd question the cranks too. The HO's are rated to about 450hp. The Boss block can take 600hp no prob.

I do disagree with the supercharger on a stock motor being any less reliable than a N/A car making 340hp. As long as it sits under 9psi I haven't seen a whole lot of complaints from the squeeze users. An 8psi unit with GT-40 irons, mild cam, Cobra intake and roller rockers should make damn close to 400hp and be reliable.

Also worth noting is an 87 has no mass air sensor. You'll need to convert cause you're asking for some mondo power, 88workcar is a guru on SD, but I think even he is at it's limits running low 12's N/A.

02-20-2001, 05:27 PM	#14
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	The Cobra intake will never support more than 400hp. I can't see it happening with heads under 2.02 either. If you want 450-500hp N/A the only 302 that could do it reliably is the Boss motor. My uncle has a '69 Boss 302, when he had his engine in for assembly in OK the guy actually had another one on the dyno shortly before. The compression was dropped from 11.5:1(or 13:1, can't remember) to 8.5:1 with dished pistons so he could run low octane pump gas. It had the stock cam, '70 heads with the smaller 2.19" intake valves as opposed to 2.21" in '69. It rated at 368hp and 340lb/ft. Stock they were good for 400hp, and with a cam, some port work and tuning they should make 500hp, the 5.0HO will not see 500 N/A without being wigged out beyond belief. The stock block would be very questionable at that hp level as well. I'd question the cranks too. The HO's are rated to about 450hp. The Boss block can take 600hp no prob. I do disagree with the supercharger on a stock motor being any less reliable than a N/A car making 340hp. As long as it sits under 9psi I haven't seen a whole lot of complaints from the squeeze users. An 8psi unit with GT-40 irons, mild cam, Cobra intake and roller rockers should make damn close to 400hp and be reliable. Also worth noting is an 87 has no mass air sensor. You'll need to convert cause you're asking for some mondo power, 88workcar is a guru on SD, but I think even he is at it's limits running low 12's N/A.