69 Hipo 390 plug gap
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
I have 2 listed for 69 390. No hipo as the 69 390 was the IP (improved performance) engine 320 HP. BF-32's with a .034 gap for auto trans and BF-42's with a .034 gap for std trans. That said I gap all my plugs at .032 and as they burn the gap gets wider.
Thread Starter
|
Senior User
Joined: Dec 2007
Posts: 206
Likes: 0
From: Good Hope, GA
Thanks for the info. I have no idea what trans was originally behind this motor. It came out of a 69 Mach 1 'Stang, and now resides in my 67 F-100. I don't know the date code on the block, but the heads are 68 C8ae-Hs.
The PO had autolite 45s in it and they were gapped somewhere north of 40 thous. Anyways I stuck 45 back in it and set the gaps to 35 and figured I coulden't be far off.
Gabe
The PO had autolite 45s in it and they were gapped somewhere north of 40 thous. Anyways I stuck 45 back in it and set the gaps to 35 and figured I coulden't be far off.
Gabe
Thread Starter
|
Senior User
Joined: Dec 2007
Posts: 206
Likes: 0
From: Good Hope, GA
BTW, while I'm in the FE forum, what would be a good place to stop revving said 390? Like I said I've got it in my F-100 and I don't have a tach in it, but in 1st(its got a 3.03) it seems like it will just keep on revvin..... I love that truck:-)
Super Moderator
Joined: Apr 2004
Posts: 34,491
Likes: 2,805
5500 would be a good redline for a new, stock 4bbl engine. 4500 would be better if there are question marks about valve gear, etc. I used to think I was revving our 390 2v to the moon. I used one of those calculator gizmos on the web and I doubt I ever had it much over 4000, and I doubt it would spin much over 4500 even if you held it. 4bbl motors with more aggressive cams are a different story. But remember, it's qualified for AARP, so unless you've gone through it, I'd be conservative with the loud pedal.
Thread Starter
|
Senior User
Joined: Dec 2007
Posts: 206
Likes: 0
From: Good Hope, GA
5500 would be a good redline for a new, stock 4bbl engine. 4500 would be better if there are question marks about valve gear, etc. I used to think I was revving our 390 2v to the moon. I used one of those calculator gizmos on the web and I doubt I ever had it much over 4000, and I doubt it would spin much over 4500 even if you held it. 4bbl motors with more aggressive cams are a different story. But remember, it's qualified for AARP, so unless you've gone through it, I'd be conservative with the loud pedal.
That sounds pretty reasonable. Like I said, I don't have a tach in it, but I think I'm gonna grab one just to see what she is doing. I have NO clue as to what has been done to this motor. I figure it must have been gone through at some point though. It dosen't smoke at all and runs beautifully(honestly like a new truck), although it could just be a low mile motor. The Mach 1 got totaled(so I'm told) from the rear and the owner had both it and the f-100 sittin in his barn. Apparently the stock 352 was pretty worn in and out so in went the 390. The truck shows 30 almost 31k so I'm gonna guess that prolly 230k though it could be 130k. The problem is I have no clue at what point (mile wise)the 390 was thrown in. I believe it was around 94-95....
Anywho, thanks for all your help!
Gabe
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Then drive it like you stole it! LOL
Trending Topics
Thread Starter
|
Senior User
Joined: Dec 2007
Posts: 206
Likes: 0
From: Good Hope, GA
Man I tell ya what, I have trouble keeping my foot out of it! The only thing I wish was different was a 4 or 5 speed, but the 3 is better than an auto!
But thats not a bad idea on the compression test.....
But thats not a bad idea on the compression test.....
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Binder Guy
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
2
May 9, 2004 01:35 PM
millbobs
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
3
Mar 30, 2001 06:26 PM
studfisherman
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
2
Jul 6, 2000 05:23 AM
