Posts: 1175
From: Sayreville, NJ, US
Registered: Mar 2000

posted 01-17-2003 01:37 PM               

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Posts: 1772
From: Vicksburg, MS
Registered: Dec 99

posted 01-17-2003 02:19 PM               

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Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"

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Posts: 19964
From: Lyons, IL, USA
Registered: May 99

posted 01-17-2003 02:52 PM               

Real world?
Having had a dozen or so of them over the years, I would say that well tuned, with a GOOD Holley and a set of any headers, about 320-325 is right on.
Good compression, great cam, decent heads, and a great carb made the 390 GT engine a pretty good deal.
Weight was the greatest foe of the 67-68 390 Mustangs.
66 Fairlanes and Cyclones could hold their own against GTO's, 383 Mopars, 442's etc in their day. They pretty much dominated C stock and C/SA in 1966. It was the under rated 428 CJ's, 396 chebbies that would murder them.
In case manyof you didn't know it the 396-375 chebbie as originally introduced in 1965 was rated at 425 HP.
It miraculously lost 50 HP in 1966 without a single mechanical change.
It took FoMoCo two years to learn how to play the HP rating game.

63.5-67 289 HiPo = 271
69-70 Boss 302 =290 HP

Yeah right.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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Posts: 1175
From: Sayreville, NJ, US
Registered: Mar 2000

posted 01-17-2003 03:19 PM               

is your number a rear wheel estimate?

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