Biggest cam with SO

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Biggest cam with SO

October 22, 2005, 01:20:12 AM

I'm posting this questions for a friend, being as I don't mess with the SO engines. He has an SO engine from a late 80's grand marquis, it's a roller block so no earlier than '87. I was under the impression that the stock HO cam would work, I guess I was wrong because he got a cam out of an '86 HO and the valveshiznit the pistons. He has stock heads for now.

Also, I'm tryin to explain to him that a 650 double pumper is way too much for an internally stock SO engine(w/headers). Anybody have carb'ed combos to use as examples?

Thanks,
Don

Biggest cam with SO

Reply #1 – October 22, 2005, 01:30:22 AM

the valves shouldnt have hit the pistons...because in 86, the mustang had E6SE heads, flat top pistons, and the 86 HO cam...the SO's 86+ go E6SE's, flat tops, and the non-HO cam

Biggest cam with SO

Reply #2 – October 22, 2005, 05:41:13 AM

the E7 heads with an HO cam should clear as well.

Biggest cam with SO

Reply #3 – October 22, 2005, 08:13:09 AM

Whats already been said about the cams....

As far as a carb with the SO heads, a 550-600 cfm vac secondary would be plenty( the old 289 HI-POs only used a 470)... A 650 DP would OK he had aftermarket heads, cam ,etc...

Biggest cam with SO

Reply #4 – October 22, 2005, 03:15:20 PM

I would agree with that, but he's running stock SO heads and doesn't know how to tune a carb for his life. He almost put a 50oz/in balancer on it too....lol, good way to destroy a 28.2oz/in crank. He says it hits, I haven't been to his place to check it out yet, so who really knows. Maybe he left the plugs in and it's building compression...he's a little guy so he wouldn't be able to turn it over...lol. Coming from him, that wouldn't really suprise me too much.