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Author
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Topic: 390 will it fit / exhaust manifolds
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shoe
Gearhead Posts: 116
From:
Registered: Feb 2001
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posted 01-06-2002 08:30 PM
   
I have a chance to put a rebuilt 65 390 complete into my 69 mustang. I heard that the existing 2 vertical bolt head design,like the one on this 65 motor won't fit or work .Also they said that I'd be limited on using only 1 brand header if headers are my choice... Actually I'd like to use the existing exhaust manifolds & heads ,with 2 vertical bolt holes, that are on the motor.Will it & the 390 with them on fit? Why do some folks say you need the multi bolt design(more than 2 bolts for each exhaust hole)heads,Bob
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67coupe
Gearhead Posts: 229
From: dallas NC usa
Registered: Nov 2000
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posted 01-06-2002 10:15 PM
the stock log type manifolds wont clear the shock towers unless u do a little modifications to the towers but u can use headers on the two bolt heads and they will fit good luck  ------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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Moneymaker
Administrator Posts: 13182
From: Lyons, IL, USA
Registered: May 99
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posted 01-07-2002 04:55 AM
There are no "2" bolt FE exhaust manifolds that will fit into a 67-70 chassis. Headers are your best bet for both fit and performance. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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shoe
Gearhead Posts: 116
From:
Registered: Feb 2001
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posted 01-07-2002 09:00 AM
Anybody got any good recomendations on a header that has worked for them? Shoe
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68 S-code GT
Gearhead Posts: 521
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 01-08-2002 08:22 AM
The Hooker Super Competition headers are nice but expensive. The speed bumps don?t like them though!  You will also need the 67-70 side by side bolt pattern heads on the engine. ------------------
68 S-code FB GT 4spd/3.25 PS PDB
68 J-code Cp Sprint"B" C4/3.00 PDB PS AC
99 F150 XLT Ext/cab, 4X4, 5.4L, 3.55LS [This message has been edited by 68 S-code GT (edited 01-08-2002).]
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shoe
Gearhead Posts: 116
From:
Registered: Feb 2001
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posted 01-08-2002 08:58 AM
I want to keep the 2 bolt vertical heads on my engine. So are there any headers anyone recommends that have worked for them using the 2 vertical bolt hole exhaust port design?, Bob
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DidgeyTrucker
Gearhead Posts: 760
From: Nashville, TN USA
Registered: Oct 99
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posted 01-08-2002 12:00 PM
The "two bolt heads" do not have a boss in the area where you need to drill the side holes. You will need the exhaust manifolds for a '67-'70 390 Mustang or a '66-'69 390 Fairlane/Torino/Comet/Cyclone.
Most people call these 390GT manifolds, but they were used on all 390 applications in these cars.
The top bolts on the two middle ports come real close to the shock towers and it is difficult to install these bolts.
 Tracy [This message has been edited by DidgeyTrucker (edited 01-08-2002).]
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DidgeyTrucker
Gearhead Posts: 760
From: Nashville, TN USA
Registered: Oct 99
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posted 01-08-2002 12:07 PM
I think the most common headers will be 428 headers. But look at the above photo. The CJ heads have the holes above the two end ports lower than the other heads. The mounting flanges should have enough material to re-drill these holes. Make sure the headers have 16 holes so they will have the top and bottom holes you need.Tracy
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TomP
Gearhead Posts: 4055
From: Delta BC Canada
Registered: Dec 99
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posted 01-09-2002 03:38 AM
most any headers to fit the Mustang have both bolt patterns. You can use them with only the up and down pattern. Some bolts will be hard to reach in the lower holes and a couple of the tops are real tight to the towers. You don't need the side bolts and the 65 heads have no material to drill into anyways. The log manifolds that came off the 65 require butchery to fit the car, don't try to fit them. 
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