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Ok. After talking with my buddies at a cruise Weds nite and getting busted about my boat anchor saying a stock stroke/ rod and iron head 390 wont make power. My question is what is the quickest 1/4 mile 390 you guys have heard of. No strokers/ aftermarket heads or blocks just run of the mill ford stuff in a regular body car. Thanks guys.
The 66-67 390 GT/GTA engine is what most people remember the 390 as a turd. With the restrictive "S" manifold, 600 cfm carb, choked exhaust manifolds, limp cam with it's heavy valve train and weak valve springs the stock 390 could barely spin 5K. Not much of a match up against the typical 66 Chevelle 375 hp/396. with its hotter cam, more cfm carb, free flowing exhaust and about the same weight as the Fairlane or Mustang.
I don't disagree with your assessment of 390's, but I thought the '67 GT cam was the same one used in the 428 CJ for a while and had some beef to it?Quote from: RJP on June 27, 2014, 02:05:44 PM The 66-67 390 GT/GTA engine is what most people remember the 390 as a turd. With the restrictive "S" manifold, 600 cfm carb, choked exhaust manifolds, limp cam with it's heavy valve train and weak valve springs the stock 390 could barely spin 5K. Not much of a match up against the typical 66 Chevelle 375 hp/396. with its hotter cam, more cfm carb, free flowing exhaust and about the same weight as the Fairlane or Mustang. If memory serves the 67 GT cam was 270/290 dur. but with slow ramps so the effective duration [@.050"] was only about 210-220 deg...Not a real barnstormer compaired to what GM was installing. But also the bigger cam was still inhibited by the "S" intake [more suited for F-250 trucks] choked exhaust and the 600 Holley. Valve train and springs were from the 2V/270 HP-300HP bread and butter 390s found in Galaxie sedans and wagons. My daily driver is a 66 GTA Fairlane with a fresh .030" over 390, 9.6 to 1 c/r, mild Crane hyd. cam, stock exhaust manifolds, unmodified Streetmaster intake with a 600 Holley. I did the heads with SS CJ size valves and C/M retainers with good springs. Engine spins to 54-5500 effortlessly and enough power to easily hold it's own in any stoplight confrontation.
I know of at least one 390 Stocker with iron heads and .481/.490 lift cam that can go 10.50's at 3600 lbs..........if he lets it.
What RPM range? 6K to 8K. Cams get lazy with no lift, so we have to spin'em up. I am not the only one......there is a short list of those who can get the goods out of an iron head for the rules............ but with no rules to bind you..........the right CJ sized valves and the right valvejob and bowl cut goes a long way. Seems like we did some "R" heads for a guy over in Dallas a few years ago with no rules and a little porting that made about 600 hp on his builder's dyno. I sent them the heads, flat tappet cam, and other parts, and they assembled it. I think it was a 445 best I remember, but iron heads, anyway, and between 6000 and 6500 rpm peak.
I don't disagree with your assessment of 390's, but I thought the '67 GT cam was the same one used in the 428 CJ for a while and had some beef to it?Quote from: RJP on June 27, 2014, 02:05:44 PM The 66-67 390 GT/GTA engine is what most people remember the 390 as a turd. With the restrictive "S" manifold, 600 cfm carb, choked exhaust manifolds, limp cam with it's heavy valve train and weak valve springs the stock 390 could barely spin 5K. Not much of a match up against the typical 66 Chevelle 375 hp/396. with its hotter cam, more cfm carb, free flowing exhaust and about the same weight as the Fairlane or Mustang.