460 Ford Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
17 Posts
Discussion Starter #1
Hey guys, building a mild 460 for towing, I have a older set of take off heads I'd like to get some info on. They have been ported, I can measure the valves, and have factory bolt on pedestals. The only info I have on the port job is a hand written flow sheet I'm having a hard time making sense of.
 

Attachments

·
Registered
Joined
·
17 Posts
Discussion Starter #2
I apologize for not saying this before, they are d3ve heads. I don't know how much these things can flow, but is it safe to assume they are better than stock?
 

·
Registered
Joined
·
17 Posts
Discussion Starter #3
Anyone? The only thing I can guess is the numbers on the left is lift? I'm trying to figure out if these things are any good to use, I was told there was a decent amount of beadwork done, but I only have receipts and that hand written chart. Thanks.
 

·
Registered
Joined
·
17 Posts
Discussion Starter #4
If there is any math involved, I'm sure there is, if I take that top number on top " int 295" and multiply it by the decimal numbers, that replicates what they got for 254cfm at 500 lift.

295x.85=253.7~254

If this is the case what is 295 representing and what are the decimal numbers representing?

And finally, is 254 cfm at .500 any decent? And on the exhaust side 174cfm at .500?
 

·
Registered
Joined
·
5,483 Posts
If the numbers are accurate, they're pretty typical of D3 heads with mild porting. For what you're doing, they're fine.


.
 

·
Registered
Joined
·
17 Posts
Discussion Starter #7
Looking In the engine build specs page, my 268 cfm intake at 600 lift is horrible? It's showing 315 ish and 180 ish exhaust, I though factory d3's intake was closer to 300cfm? So that really can't be the right way of calculating cfm... Exhaust is nicer though.
 

·
Registered
Joined
·
17 Posts
Discussion Starter #8
it would make more sense to see the first number as a stock volume at x lift, and the number next to it was the ported volume at x lift, but that doesn't tell me much else,
 

·
Registered
Joined
·
5,483 Posts
Can you explain what the numbers are?
Numbers on the left are lift. The rest, looks like some sort of non-standard or home-brewed flow measuring devise that was then converted to 28" depression or something on the far right. Maybe before and after porting numbers on the middle and right hand columns....kind of looks like it with 139cfm before and 174cfm after noted on the exhaust.

At the end of the day, ~270/170 is pretty typical of a mild port job on D3's, and far better than stock. As I said before, for your application, they're fine. Even stock un-ported heads are fine. Run em.


.
 
1 - 10 of 10 Posts
Top