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I thought he meant Hi-Po heads when I first read it but think he's talking about 5.0L HO heads. Have to be careful in matching what ever he has. Them 289's could vary a bit in their stock piston availablity, especially after how many years.
The 302 heads and the 289 heads are identical with the exception of the combustion chamber. The combustion chamber is larger than the 289 heads. But i'm not quite sure how that would effect it all, you'd lose compression, i know some people put the 289 heads on their 302 for better compression..
1967 Mustang Coupe
-68 302 4bl 5.0l.
Edelbrock RPM Performer Aluminum Heads, Edelbrock RPM Performer Camshaft, Edelbrock RPM Performer Air Gap Intake, Edelbrock AVS 650CFM, Tri-Y Long Tube Headers, Fully forged 331 stroker bottom end, Bored .030 over, Posi rear end with 3.25 gearing
Stage II B&M Built Transmission
Sorry, they are HiPo heads off a '64 289 and from the code on the heads it's telling me they are HiPo's. I have a '65 block and a '66 block and was thinking of getting these heads and flipping one of the 289's to a HiPo.
They might have the same casting numbers but there are several with that same casting number. they should have the screw-in studs, machined pockets and cups for the valve springs. that all can be faked. There is another casting mark on the heads, think it's a number in a circle that tells for sure. Veronica knows the right code. Compression ratio on them motors could be 10:1 or even 11.6:1, way too high for todays gas.
Yes they will fit any 289 engine. You wont have to change anything. Since they are hipo heads, they will already have screw in studs so if you get them redone, the will most likely deck them and do a valve job and install new springs. Wont be that expensive unless you have them install hardened valve seats. Heads back then did not have hardened valve seats. When the use of unleaded gasoline came along, so did hardened valve seats. It is recommended to have them. The opinions go both ways here on this issue.
You would be fine without them as long as you do not "get in to it hard".
'66 Ragtop, vibrant red, 289-4V, 4-speed toploader
'68 Fastback, space blue metalic, 351C-4-V, 4-speed toploader
'69 Mach I, (Pending Resto Project)
'66 Fastback (because I wanted one)