I can go along with the large port theory, but I cannot prove it either way---it sounds plausible. Unless we have done it or was standing there when it was done, none of us can prove much of anything, that includes me. There are very few that can claim the highest output from iron C heads, that I have seen. Even Chebby has its one and only of that era, "Smokey". Thats not a flame, just the simple truth---as I see it.

When I surf the PM site, they, like many others, including Parker (Australian) I see the new "port fillers" the offer for the big port head (335/385) and some Chebbys. Lot of money is spent trying to get those heads re-engineered to flow for some reason. There is an awful lot of evidence that the heads respond to improvement, above porting and it "aint" for appearance!

For the time being, I see the alloy heads (at least some) as being equal to the C's in power production with a weight advantage. If I had the money to spend, it would be on an alloy head and not on improving the iron C-type heads. Save the C's for number matching on classics. Anyone who wants to fix up a pair of iron heads and send to me, I will sure put them on the "Stang"

Now for 64fords question, I sure would like to see someone try for W heads on a 335 block!

 

I did a quick look at some flow charts and it seems that most 4bbl C head are only good for ~255/160 in stock form. The 2bbl heads are slightly less on the intake, but the exausts are about the same. I am not saying these charts are correct, but that seems to be the general indication. For example, the AFR 165 heads flow about that, but they are inline and cc ported.

To get 300/255 takes a lot of work and flow benches that most dont have. Regarding the engineering involved for the C's, it may be true, but those same engineers also designed the C3B alloys and other variations, which had one thing in common that was to straighten out the ports, cut the volume, fill in those dead zones in both I & E. I believe that I can still make my point about the late W alloys and still not disagree with the capabilities of the Iron C heads.

64ford--- asked if W heads could be put on a 400 block, and the answer is yes. I believe that Price motorsports make an adapter for a W intake on that wider block to match the heads, at least they did make an adapter once for a W head on a C block with a W 302 intake spacer/adapter. To put 4bbl heads on a 400 is going to require an adapter anyway, because the only 4bbl intakes were for C blocks and would require a spacer/adapter anyway. If you deviate from OEM packages, you will have to have some sort of an adapter, so pick your poison. BTW, I just saw that edelbrock now makes a C style head that has the correct waterjacket ports to fit the W blocks for making a "Clevor".

We can discuss all day long which has the most peak flow or balance or output, but thats above most of us anyway. I doubt anyone will be spinning a 400 block with any kind of head at 6500-7000 rpm, so all we need is a head/intake combo that will support our limited use. Leave all the flow science for Kaase!!

 

I have seen a set of 4v's on a small block chebby......... Medford Speed shop in Medford, NJ has a small chebby w/4v's on it. No BS call and ask for Jerry.

The 4V closed chamber head breaths so well in the top end... that it would still post good flow numbers way past what your engine would spin.... makes ya think huh?