351 heads ?'s

Z06killinSBF · Feb 24, 2008

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?

D.Hearne · Feb 24, 2008

The 69 Windsor heads are the same for both 2 bbl and 4 bbl. Chambers are listed as 58-60 ccs, the C6OE 289 heads are 54 ccs. E7 chambers are 64 ccs. 2-4 ccs on a 289 yeilds about a quarter to half point decrease in compression. You can always mill the heads to negate that.

Z06killinSBF · Feb 24, 2008

Are the 69 heads worth building up?

D.Hearne · Feb 24, 2008

Depends on what shape they're in now and what use you're going to put them to.

danny clemens · Feb 24, 2008

What's the attraction to the E7 heads? Is it availability? I've read about a lot of people using them but never did know why they chose that specific head over others.

Rusty67 · Feb 25, 2008

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.

Z06killinSBF · Feb 25, 2008

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.

D.Hearne · Feb 25, 2008

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 · Feb 25, 2008

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.

Z06killinSBF · Feb 25, 2008

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?

D.Hearne · Feb 25, 2008

First find out what springs are oin those E7's, then decide on how wild you want to go. You've got an "RV" type cam now. Good for bottom end to midrange and mileage.

Z06killinSBF · Feb 25, 2008

If I remember correctly, my friend said they were the Comp's step up from the stock springs. Probably good for about .520 lift.

57fairlane · Feb 26, 2008

the 270 magnum works pretty well for combos like yours . . .

one of the few flat tappet experiences I have.

I am sure there are other selections out there.

bnickel · Feb 26, 2008

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.

Z06killinSBF · Feb 26, 2008

Are the 289 heads better than the 351's?

Rusty67 · Feb 26, 2008

Not a chance.

bnickel · Feb 26, 2008

Rusty67 said:
Not a chance.

right, small valves and tiny ports

Z06killinSBF · Feb 26, 2008

Noted, thanks everyone.

So basically keep what I have and save $$ to get some after market heads?

bnickel · Feb 26, 2008

note necessarily, just warning of the potential pifalls involved with either one. even the stock 351 heads will probably be a nice improvement over the stock 289 heads with little or no work involved but the E7's aren't going to be a perfect bolt on either.

Z06killinSBF · Feb 26, 2008

bnickel said:
note necessarily, just warning of the potential pifalls involved with either one. even the stock 351 heads will probably be a nice improvement over the stock 289 heads with little or no work involved but the E7's aren't going to be a perfect bolt on either.

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.

351 heads ?'s

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