How good are the 69 351 2v heads? Are they better than ported E7's? What would my compression be on a 289? What are the combustion chamber size on them?
351 heads ?'s
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Rusty67
Dirt-Old 20+Year Member
If you port both heads you can get more out of the 69/70 351w heads. The E7TE heads are all over the place. You can get them off of a bunch of different motors and they make a decent amount of power if you port them well.
The 351 head are in a rebuilt, stock shape. I can get them off my friend for probably nothing.
The reason I have E7's is that for the $50 I paid for them, I got screw in studs, FMS roller rockers, Comp springs, 3-angle valve job, bowl blended, port matched, etc....
My question is, if I get the 351 heads is it a benefit to make the swap? Or should I save for the next few years and get some AFR 185's. The heads are going on a not mild but now wild 289.
The reason I have E7's is that for the $50 I paid for them, I got screw in studs, FMS roller rockers, Comp springs, 3-angle valve job, bowl blended, port matched, etc....
My question is, if I get the 351 heads is it a benefit to make the swap? Or should I save for the next few years and get some AFR 185's. The heads are going on a not mild but now wild 289.
If the E7's have all that done already, keep em. E7's are better to start with over all the earlier run of the mill stock heads plus Ford used em on all the Mustang , pickups and van 5.0's from 87-97. Plus a few other applications. The only help they really need is opening the exhaust ports and bowl blending to make a good budget head. Anything more in porting and valve upgrades, you're better off buying aftermarket heads.
Rusty67
Dirt-Old 20+Year Member
I agree, since the heads are already worked and setup to go just use them. The 351w heads are going to need $$ to make them out perform and the money might be better spent elsewhere.
Ok, so I'll just keep the E7's. Do ya'll think a cam change would gain much. I know my cam isnt much, just an old Isky 262 Supercam: .445/.445 lift 208/208 @ .050 108 LSA. What kinda cam would be a good upgrade?
If I remember correctly, my friend said they were the Comp's step up from the stock springs. Probably good for about .520 lift.
the e7's on your 289 will probably yield 8:1 or less compression so plan on having them milled....a lot
if you put them on without milling them you'd be better off using the stock 69 351 heads because all the gain you'd get from the porting will be lost on the compression if not more.
if you're good with a die grinder you can probably do a hom port job on the 351 heads and get about the same power as the e7 heads after having them milled, then just swap all the goodies from the e7's to the 351 heads.
i think at thi point it's a wash as to which heads would be best for your 289....either are going to need plenty of work, less with the e7's but you're going to run the risk of valvetrain geometry problems and the e7's will have to so much material taken off of them to get the compression back up that you'll likely have overheating issues with them down the road.
if you put them on without milling them you'd be better off using the stock 69 351 heads because all the gain you'd get from the porting will be lost on the compression if not more.
if you're good with a die grinder you can probably do a hom port job on the 351 heads and get about the same power as the e7 heads after having them milled, then just swap all the goodies from the e7's to the 351 heads.
i think at thi point it's a wash as to which heads would be best for your 289....either are going to need plenty of work, less with the e7's but you're going to run the risk of valvetrain geometry problems and the e7's will have to so much material taken off of them to get the compression back up that you'll likely have overheating issues with them down the road.
Rusty67
Dirt-Old 20+Year Member
Noted, thanks everyone.
So basically keep what I have and save $$ to get some after market heads?
So basically keep what I have and save $$ to get some after market heads?
I already have the E7's on the car. I runs really strong but hits a wall at 5500 rpm. Did some talking with the old man and decided that the factory style heads are holding me back. I know I dont have a monster cam but I dont wont to make my car a dog by putting a big cam in it. I suspect the motor is making about 8.5-9.0:1 comp. No one has given me a solid answer yet.
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