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The v in 302 4v or 289 4v doesnt stand for valve, it stands for venturi, as in 4 barrel carb.
The early heads were the same whether 2 bbl or 4 bbl with differences year by year in chamber size for both inductions. Valve sizes and ports were smaller for the 221 and early 260 (I think) than the 289 and 302. The stock A codes had higher compression, 4 bbl (4V) carb and cast iron 4 bbl intake. For '68, the J code (4 bbl) had smaller combustion chambered heads than 2 bbl heads and flat top pistons. I'm pretty sure those were the only differences. The valve trains did not differ between 2bbl and 4 bbl. It did change in '67 or so when rockers went to rail type and push rod openings became larger.
You cannot run 4 valve heads on a pushrod motor. The link you posted shows ONLY 2 valve heads (1 intake valve and 1 exhaust valve per cylinder). It sounds like you're confusing 2v and 4v heads with 2 valve and 4 valve heads.
The 2V and 4V identifies the number of Venturis the carburetor has. A 4V(4 barrel) drops about 1.5"WG while the 2V is about 3"WG. The 4V tends to have less open and smaller combustion chambers .
The 302 4V can easily be mistaken for the 289 head and was only made in 1968 (53.5cc chambers). The 302 2Vs were 63cc until mid 1969 when they dropped to 58.2cc. Then in 1977 the chambers went up to 69cc until the eighties, when you get the E5 and E7 series heads.
The 351 4V was only made from 1969 to 1971. Both the 4V and 2V had 60.4cc chambers. The 2V got smaller 302 sized valves in 1978.
The pistons, compression heights, etc were matched to each type to maintain design CR (compression ratio).
Here's a some technical data:
2V head ports flow 235 CFM of air at 25inches of water vacuum. 493 Hp potential.
4V head ports flow up to 330 CFM of air at 25inches of water vacuum. 690 hp potential.
*Check out the 2 pictures I attached. The first picture is a set of 2 valve heads (1 intake and 1 exhaust valve per cylinder) and the second picture is a set of 4 valve heads (2 intake and 2 exhaust valves per cylinder).*
The only way you can run 4 valve cylinder heads is with Double Over Head Cams (DOHC) which is 2 camshafts per head, 4 camshafts total on a Ford V8.
excuse me for going a little off topic but you all seem to know alot about FoMoCo factory heads and I got a question about the onces that I have...
I have a pair of 1965 4v head and when I bought them I was told that the "combustion chamber" was smaller on the 1965 then on the 1966 4v heads. Does anyone know if this is true? How big are they? What would the compression ratio be on a 1966 289 4v with 1965 4v heads?
Son of a *****! 11 grand on a pair of dang heads? I didn't see any for Fords though. I bet they would cost more as do all ford parts it seems.
Oops, didnt see the place for cleveland. What i get for not reading all the way. But i was right! 12 grand!
1966 Mustang- "Five liter Fury"
Wimbledon white with guardsman blue stripes
Ford Racing 302 gt40 aluminum Heads, e303, Edelbrock rpm intake, edelbrock 600, All Forged, 1.6 roller rockers. 340 hp, Ford racing t5 super duty,
Last edited by FordGtMan; 07-29-2009 at 09:44 PM.
Yes, $12,000 for a set of assembled heads is a tad steep. The CHI 260cc CNC fully assembled heads are $4,600, bare $3,000. So $1,600 for valves, springs and assembly. Double that for 4 valves per cylinder that comes to $3,200 plus heads is $6,200.
Still, for $12,000 fully assembled you will have an extremely rare Cleveland. It should be worth some serious horse power and popping the hood on cruise night it will be some major BLING!