289 heads?
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289 Heads
There's nothing "wrong" about the heads however they would be among the worst choices for performance you could make.
If you are restoring a 289 and want to stay original they are all right.
If you want performance I would go with an "E7" or GT40 head. There are enough of them lying around you should find some cheap especially the "E7".
"E7" is the casting number under the valve cover.
There's nothing "wrong" about the heads however they would be among the worst choices for performance you could make.
If you are restoring a 289 and want to stay original they are all right.
If you want performance I would go with an "E7" or GT40 head. There are enough of them lying around you should find some cheap especially the "E7".
"E7" is the casting number under the valve cover.
Your stock E7's are better.
For $200, you could buy some Gt-40P's and have an even better head.
To me, swapping off a E7 head for untouched 289 heads is a downgrade. Save your cash.
For $200, you could buy some Gt-40P's and have an even better head.
To me, swapping off a E7 head for untouched 289 heads is a downgrade. Save your cash.
Posted via Mobile Device wow this has to be the first time i've heard bad things about 289 heads. The potential is in the port possibilities. The bonus is that they have i believe 54cc bowls so if you take the time to port them and put big valves in them you'll also get bumped up to a good 10:1 compression ratio. The key is porting them but they do work well if done right. Stock for stock the hipo heads will destroy e7s but they're not easy to find and you need to at least change the valve guides.
The exhaust side of the 289 head is more restrictive stock but just swapping stock heads should pick you up 10-15hp.
I ported a set of e7s back in the day (about 3 years ago) that ended up flowing a whopping 177cfm on the intake @ .520" just the other day on a Superflow 110. The 289 heads stock went 175cfm at the same lift.
I spent 30 minutes in the intake (did as much as my ability allows) and it flowed 201cfm @ .500" still with the stock valve.
I still have a few tricks (some chevy valves, brass tubing) and I wouldn't doubt the intakes would go 230 or so at max lift.
I ported a set of e7s back in the day (about 3 years ago) that ended up flowing a whopping 177cfm on the intake @ .520" just the other day on a Superflow 110. The 289 heads stock went 175cfm at the same lift.
I spent 30 minutes in the intake (did as much as my ability allows) and it flowed 201cfm @ .500" still with the stock valve.
I still have a few tricks (some chevy valves, brass tubing) and I wouldn't doubt the intakes would go 230 or so at max lift.
haven't touched them yet, been too busy at school with other stuff
trying to port my 460 D3 heads and original torker intake (cut and welded) inbetween my other classes.
I am going to try to get to it monday as well as take some pictures. 201 isn't exactly hot stuff but the port looks good.
rd
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Not sure I would go to the trouble of trying use old 289 heads on a 5.0.
They have press in studs, that one would want to change for screw in. They are probably old enough to need another valve job, as well as new guides. You need to look at the valve stem length, see if they have rotators and stock springs still on them. If so, these need to be replaced for performance use. The valve sizes, port sizes, etc are not any better than later 5.0 heads. Verify that they have accesory bolt holes where you need them. Unless you are doing a resto on a 289, you are handicapping yourself at the start. I have had several sets of these laying around and every time I price out using them, it cost more than newer, much better heads.
E7's, or iron Gt 40s would be a better starting point.
They have press in studs, that one would want to change for screw in. They are probably old enough to need another valve job, as well as new guides. You need to look at the valve stem length, see if they have rotators and stock springs still on them. If so, these need to be replaced for performance use. The valve sizes, port sizes, etc are not any better than later 5.0 heads. Verify that they have accesory bolt holes where you need them. Unless you are doing a resto on a 289, you are handicapping yourself at the start. I have had several sets of these laying around and every time I price out using them, it cost more than newer, much better heads.
E7's, or iron Gt 40s would be a better starting point.
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