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post #1 of 8 (permalink) Old 05-14-2003, 07:24 PM Thread Starter
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351C Heads

I picked up a set of 2v heads last weekend.
I'm pretty sure they are D5AE castings.

Is there much to be gained by installing 4v sized valves in these heads? Are the 2v valves really much of a restriction?

Keep in mind I will fully port them, and I'll be running them with a purpose built aluminum tunnel ram on a 351 Windsor.
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post #2 of 8 (permalink) Old 05-14-2003, 07:54 PM
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351C Heads

Unfortunately, a D5 head is a 351M-400 piece.
It is not as good as a early 351C 2V head because of its exhaust port/valve bowl.
It is the same basic casting, but they changed the exhaust port (for the worse) to keep it in line with the emissions requrements. A D0, D1, or D2 Cleveland 2V head has a slightly larger exhaust port with a better passage than a 1973 or later head.
You'd be better off to get an earlier set of heads, or a set of the Aussie 2V heads with the closed chambers.
Im not saying that you cant do up your heads that you have, because you can still port them and get good performance from them, but you'll be doing more work on the exhaust side than you'd normally have to.
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post #3 of 8 (permalink) Old 05-14-2003, 09:09 PM Thread Starter
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351C Heads

yes, I pulled them off of a 351M, and I'm aware that they are not exactly the same as 351C pieces... I'm just curious how much there is to be gained by increasing valve diameter on these heads when they are fully ported.

I'd love to have a real Cleveland engine... but they are hard to come by around here. In fact, in all the ford stuff I've owned, bought, or sold... I've never come across a single 351C or even any parts

[ This Message was edited by: cwtoyota on 5/15/03 9:22am ]
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post #4 of 8 (permalink) Old 05-14-2003, 09:54 PM
 
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351C Heads

Hey CW...I have 2 4-bolt clevelands(block,crank and pistons) just waiting to be bought. If you are interested at all just drop me an email [email protected]

Aaron


[ This Message was edited by: Oliaar on 5/15/03 9:54am ]
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post #5 of 8 (permalink) Old 05-15-2003, 03:28 AM
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351C Heads

the ehads you have are ok, but the 4v valves are way too big, and will take far more work to install for any value they may have. if you are building a steer motor stick with the stcok valves. if you really want the 4v valves get a 4v head.

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post #6 of 8 (permalink) Old 05-15-2003, 04:24 AM Thread Starter
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351C Heads

rbohm, that's what I was thinking...

It doesn't seem like the bigger valves would make much difference with the 2v ports... even with heavy porting.
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post #7 of 8 (permalink) Old 05-15-2003, 11:27 AM
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351C Heads

Don't. There is gain, but there is also a problenm with putting a "hole" in the flow curve above .450 with the big valves. If I had to do mine over, I'd stick with Ferra sainless 2.08's. And, before you spend much $$$ on those, take a look at the cross section of the exhaust port on my web site: http://users.abilene.com/~dkelly/hotrod/newmotor2.html

Bottom of the page, left hand side.





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post #8 of 8 (permalink) Old 05-15-2003, 12:51 PM
 
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351C Heads

I have a set of '76 casting "m" heads I did port and added 2.10 Ferrea intake valves too. The exhuast flow "decent" with the stock sized valve after porting, but my work on the intake side left a lot to be desired. I wouldnt mess with 2v heads, especially if you are going to put a sheetmetal tunnel ram on it. (figure it's going to be a sheetmetal intake since no one makes a tunnelram for a windsor.) Basically, if you are going to get that serious about it, why mess with 2v heads of any variety?
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