360/390 identification?
Thread Starter
|
5th Wheeling
Joined: Mar 2024
Posts: 39
Likes: 3
The only definitive way to know is to measure stroke. You measured at approximately 3.75", so that would make it a 390. You could measure again just to make sure. I'd use a small wooden dowel and mark the BDC and TDC and measure the distance between those 2 marks.
Fleet Mechanic
Joined: Feb 2022
Posts: 1,370
Likes: 705
Read posts above. The only way to reliably determine a 360 vs. a 390 without disassembling the engine is by measuring the stroke. It doesn’t matter much anyway. There was about 15hp worth of difference between the two. All you are really determining is if you’re going to have to buy a new rotating assembly if/when you pull the engine and want more power.
Super Moderator
Joined: Apr 2004
Posts: 34,476
Likes: 2,800
C7AE-A heads with an 8 bolt exhaust manifold pattern are passenger car heads. It's not unusual to find heads mixed and matched due to the large number of engines that needed valve jobs--I think there was an "exchange" way of doing that in the day where you got your refreshed head from the pile of finished ones and they reworked your old head later.....
How does it run?
Thread Starter
|
5th Wheeling
Joined: Mar 2024
Posts: 39
Likes: 3
That intake probably carried through production, but on a '73 I would expect to see D2TE heads.
C7AE-A heads with an 8 bolt exhaust manifold pattern are passenger car heads. It's not unusual to find heads mixed and matched due to the large number of engines that needed valve jobs--I think there was an "exchange" way of doing that in the day where you got your refreshed head from the pile of finished ones and they reworked your old head later.....
How does it run?
C7AE-A heads with an 8 bolt exhaust manifold pattern are passenger car heads. It's not unusual to find heads mixed and matched due to the large number of engines that needed valve jobs--I think there was an "exchange" way of doing that in the day where you got your refreshed head from the pile of finished ones and they reworked your old head later.....
How does it run?
Super Moderator
Joined: Apr 2004
Posts: 34,476
Likes: 2,800
D2TE heads would have had induction hardened valve seats as OEM.
C7 heads would not and might be more susceptible to burning valves or sinking the valves as the seats erode. The harder the engine is worked, the more likely this is.
Light work and easy use? Could last for decades.
You can pull the valve covers and see if the valves are even as part of checking things.
Choking at 2800 RPM is not because it's a 2bbl.
You should check the usual tune up items.
Check the carb to make sure the choke is open.
Check fuel delivery and pressure and filter.
Do a compression test.
Check your exhaust system for obstructions like crushed pipes or mufflers coming apart inside.
Performance wise the heads are equal to or better than the OEM heads.
C7 heads would not and might be more susceptible to burning valves or sinking the valves as the seats erode. The harder the engine is worked, the more likely this is.
Light work and easy use? Could last for decades.
You can pull the valve covers and see if the valves are even as part of checking things.
Choking at 2800 RPM is not because it's a 2bbl.
You should check the usual tune up items.
Check the carb to make sure the choke is open.
Check fuel delivery and pressure and filter.
Do a compression test.
Check your exhaust system for obstructions like crushed pipes or mufflers coming apart inside.
Performance wise the heads are equal to or better than the OEM heads.
Thread
Thread Starter
Forum
Replies
Last Post
72bumpside
1967 - 1972 F-100 & Larger F-Series Trucks
3
Jun 28, 2024 05:02 PM
Brad Brown
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
Dec 2, 2021 10:28 AM
smoke n tires
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
Dec 6, 2004 09:38 PM
HBINGER1
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
7
Jan 7, 2003 06:13 PM
