64.5 mustang with 260V8?

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Asked by Jan 28, 2015 at 01:17 PM about the 1964 Ford Mustang Standard Coupe

Question type: General

I have a 64.5, and it has the Original 260 V8. I pulled the heads off, to replace it with some 351W 1969 DO0E Heads,the top of the pistons are stamped 0.40. It was rebuilt 3K miles ago, from the first owner. Can anybody tell me the new cubic inch?????

43 Answers

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Resto, is coming along great, I've decided to go all Wimbledon White,except for the seat covers, lite blue and white pony. what do you all think?????

Gorgeous. I hate you. Just kidding, envious

Best Answer

The 260 has a 3.80" bore.. (I thought the classic original 64½ only came with 289....but live and learn) anyway, the 0.40 probably means the cylinders have been bored to 0.40 over and piston would be 0.40 over also. Need to do the math..I can't. You need to find out if it's been stroked also, to get true cid

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Fordnut your right, the 260 has a 3.8" bore, and the 289-302 has a 4.0" bore, but the 64.5 where standard with a 260 as there smallest V8,they discontinued it that year, and the 289 was the only V8 you could order, for 65 and later.after January 1, 1968 included shoulder belts for both front seats. The 1968 models also introduced a new 302 cu in (4.9 L) V8 engine. or as everybody knows as the 5.0....Thanks for the complement, it is turning out better then it had thought!!!!!

1 out of 1 people think this is helpful.

π-Pi (3.14) x (Bore²) x stroke= cid of cylinder...... Using round numbers a 3.8" bore .040 over = 4.20 will give you 8 more cid. So assuming same stroke 260 + 8 = 268 cid.

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My opinion is the 5.0 is one of the best engineered engine ever, by Ford or anybody including my Toyota that I rant about. There was a company truck I worked for for a while, with dozens of drivers, most didn't care and abused it, (I really dislike people that have no respect for vehicles , property that is trusted to them and have NO respect for it) but anyway this truck went 220,000 miles, even with the abuse, with just 2 valve jobs @ 98,000 and 155,000. and nothing else but regulator maintenance..and this was years ago before synthetic oil and the drivers didn't keep proper logs and sometimes it went 20,000 between. Amazing engine.

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Thanks Fordnut:I not sure if i'm going to tare the motor down, just to pull it to paint it, i'm going to assume that it's got the factory stoke of 2.870", but i am going to check if the pistons are not going to hit the valves, by checking for clearance with some clay.but i do have a bigger cam and lifters, and springs from Elderbrock, so if i put them in, then i will measure the stroke.....Thx again BOB T

1 out of 1 people think this is helpful.

Even the 351W has a 4.00 bore and the 390 in my '76 F250 has a 4.05 . The old 360's just had a shorter stroke, actually a 4.02 bore but the pistons will swap, that 3/1000 doesn't matter, so close.

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My pleasure. I love discussing these engines

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Just one more thing..you might consider a Mallory breaker-point-less distributor. Eliminates the mechanical points..no performance diff but IMO a good option And I would LOVE to see the finished build. I can tell you will have sight to behold!

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That's a heck of a good idea,but for right, I'm just worried about the clearance, from the valves to the pistons.I'd hate to start it and blow the hole motor. The valves in the 351w DO0E Heads are so much bigger

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And your right about the 302, I talked my daughter into buying one, it's a roller motor, for her 67,thats in the paint shop,going to be a GT350 clone, Shelby hood, side scoops,spoiler and the long back lights, I'll post pic's when she gets it back next week...

1 out of 1 people think this is helpful.
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It is not a good idea to bore a small block Ford more than .030. This many times works okay, but sometimes causes overheating issues to to the thin cylinder wall transferring too much heat to the cooling system. You will be right around 265 to 268 cu inches with the .040 over bore. The 4 bbl D0OE heads will make a great improvement, but be careful to not over carb it.

2 out of 2 people think this is helpful.

I went looking for a way to check, and make 100% sure it won't be an interference, and your clay idea is the best. It probably is not, but the keyword here is 'probably'...

1 out of 1 people think this is helpful.
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I wonder if the valves will hit the bore cause the 260 has a smaller bore than the 351w. Hmm, time for more research.

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http://diyford.com/ford-cylinder-heads-valvetrain-interchange-small-block/ I think it will work okay as long as the camshaft doesn't have a huge lift.

2 out of 2 people think this is helpful.
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Fordnut, is there a better way to check the clearance? Any suggestions would be very appreciated....Thanks again....I know it's not a good ldea to bore over 0.30 over, but that's the way i bought it, I never knew!..here's a before and after....

1 out of 1 people think this is helpful.
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after.....

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Clay on the top of a piston is a good way to check for piston to valve clearance.

2 out of 2 people think this is helpful.

Only way I can think of is hand-crank the engine to TDC and take rocker arms off, wiggle valve stem and valve guides are not enough to keep it from not moving. If the valve(s) are tight, they might, just might be touching. If movement is there..not touching piston. Or maybe a camera on a stem..? Doesn't show cost though http://www.dogcamsport.co.uk/wireless-snake-inspection-camera-dvr.html

1 out of 1 people think this is helpful.

But Bob's answer is best. Take some cleaning but I'm sure that camera is expensive and probably wouldn't really work ..and use the thickest head gasket you can find

2 out of 2 people think this is helpful.
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Determine compression ratio before doing thick head gaskets. To get this figured out find out what the combustion chamber volume is on a stock 260 head and the find the volume of the 351W D0OE head and compare. Clay on top of 1 piston and rotate the engine by hand 2 full revolutions with cylinder head torqued and valves adjusted on that cylinder. It's a 4 stroke engine so do 2 full revolutions.

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http://diyford.com/ford-cylinder-heads-valvetrain-interchange-small-block/ 55cc chambers

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http://www.mustangandfords.com/news/mustang-1964/ off real topic but a very good article you will likely be interested in, a ton of information about your car

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Base price $3,725 new. One of the most appreciating cars today.

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Bob, so what your saying, is the bore of the 260 being 3.8, and the 351 being 4.00, there is a greater chance of the valves hitting the cylinder wall, instead of the piston?? Or both?

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Some engines with interchangeable cylinders heads when putting a large bore head on a smaller bore engine, if they have extremely large valves the valves can strike the top of the cylinder bore. I am pretty sure that the D0OE cylinder head with stock sized valves on a 260 won't be an issue. It never hurts to think about this type of issue when swapping heads around. I would still do as you planned and measure the piston to valve clearance with clay if you are using an aftermarket camshaft.

1 out of 1 people think this is helpful.
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Bob: I think that's exactly what i intend to do.Thanks for taking the time out to answer my concern's, it will help greatly, and also to Fordnut, and every body else, who was kind enough to answer......BOB T

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My pleasure and hope I didn't cause you any undue worry.

2 out of 2 people think this is helpful.

Some 351's have 3 valves, (2 intake) but I assume you used the 2 valve

1 out of 1 people think this is helpful.

260 valves intake diameter 1.940" exhaust 1.600 ...350 intake 2.40 exhaust 1.655"

1 out of 1 people think this is helpful.

Wow, I clicked on a set of 351W heads picture and it took me to a hard-core porn site...said 'you were looking for head?" That's terrible and I wish there was a way to put a stop to that sort of thing, what if a kid did that, and I mean to tell you it was graphic, for lack of better word. Just have to be careful on the internet but I had no way of seeing this coming

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Thanks Fordnut: Mine are two valves, from a 1970 351W 4V, Mach1, and it does take a lot of worries out of the picture. The internet is a strange beast,I have a lot of problems with Craigslist, there as many girls soliciting sex then potential buyers, for my parts,it's hard to avoid. you just have to be very couscous, And i'm lucky my kids are older, and understand, but it gets to me the same way.......

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Bob, and Fordnut,,,,Do you guy's notice the filler tube in the top of the water pump, for oil, in the pic's??? I believe, it's a 260 v8 thing only!!!!!!

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Fordnut, thanks for the math equation.π-Pi (3.14) x (Bore²) x stroke= cid of cylinder...... Using round numbers a 3.8" bore .040 over = 4.20 will give you 8 more cid. So assuming same stroke 260 + 8 = 268 cid. But my only thought would be, and i don't want say there is a flail in that ,but would that be for the hole motor, or per Cylinder?260+8=268cid, or 260+[8x8=64]=324cid? since there's 8 cylinder, or a'm i just not getting it? I'm only asking,so i'll know in the future, again Thx for the help.....

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8 cu in total. Approx. 268 cu in.

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O.K. Thanks bob, so my idea of it being [8x8] is way off...for some reason, i was thinking 8cid per cylinder, now i'll know..pulling the motor out this weekend,going to put the bigger cam,lifters, and springs in it, then i'll check the clearance, with clay. lets hope they don't hit, or may i should check, before i put the new cam,etc. in? that way i'll have a backup plan..lol lol...Thx again....BOB T

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Bob&Fordnut, here's a picture of the two heads260-351, the combustion chambers are pretty close to 52-55

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This is when i just started the restore on the dash, from dark blue, to the new Wimbledon white.The dash pad, and the carpet, ARE GOING TO BE LIGHT BLUE and light blue and white pony seat covers, any suggestions about the doors, your input would be highly appreciated, there dark blue and white???

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Earlier pic's on the doors, show the old ORIGINAL COLORS, and also show the old kick plate and back side colors, I think I'm headed in the right direction, what do you think,I'm open to all comments, and the center console is already white i think the picture shows it in light green

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What about the steering wheel, light blue. white, or wood grain?????you both know better then most, and i'll take your suggestions over my per-thoughts, because once i buy one color,it's going ON, unless i can return it, but i would rather, get it right the first time!!! if you know what i mean. If it was yours, what would you DO!!!! And be totally honest, it's not going to hurt my feelings...lol...lol....Thx again..BOB T

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The Little 260 is almost ready to fire up! Checked the clearance, and the valves are not going to hit the deck or pistons,The 351W valves should give it much more flow.The pushrods where a issue, stock to short 6.812", 351W 8.150"to long, check the length, 7.100" was it!!! EDELBROCK performer 289 intake, and 1405, 600cfm carb, and a 2122 performer-plus cam and lifter kit, and Headers. I'm keeping the body all Original, down to the 260 emblems....

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new picture 64.5 260 v8

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