WebMar 7, 2024 · That's about a .6 ratio exhaust flow to intake flow. With these ported stock heads you have to forget about the so called "ideal" exhaust to intake ratio and make up the difference with camshaft duration split. It works. Get all you can out of the intake side and try to get the exhaust flow in the 190 to 200 range. WebNov 29, 2003 · 1 Post The D3 & later heads are a LOT different in the exhaust, you can't even touch the valve stem through the port & I've seen old 283 Chevy heads flow better. If you cut them much you'll spring a leak as they are a little thin in the short side radius.
429/460 Ford Cylinder Heads - CPRParts
WebDec 27, 2002 · The nicest thing about the D3VE heads is that you can play with your compression ratios a little more. The earlier castings gave you high compression raios. … WebPorted heads are worth 20 HP as are headers. This is a high torque stump pulling combo. A 460 engine can use the next larger cam the XE262h I built this and drove it. It rocks... Combo update: A dyno tested combo like the above made 290 RWHP in an E-250 van with ported D3 small valve heads with hedman elite headers and list of people with cancer
Porting 460 Heads Pirate 4x4
WebMar 28, 2005 · Any stock head you get is going to need major exhaust port work. The least you can do is grind off the humps everywhere in the runner. That will help alot. I'd stay away from the D3's because I hear the larger chamber makes for detonation problems because of its size. If your stock pistons definetely dont use D3s. WebJun 14, 2012 · These heads can have 2.25 intake and 1.76 exhaust valves installed. The exhaust port shape is restricted quite a bit, and porting helps. After proper porting, all three casting flow the same. It should be noted, not only for these factory cast iron heads, that not only should the exhaust be ported, but the intake as well. WebThe new Eliminator Products 429/ 460 heads ... Intake porting starts at $300. Head porting. Level 1 hand porting $700. Level 2 hand porting $1050. Cnc ported level 3 add $1250. Cnc ported level 4 add $1650 adds roughly 40-60cfm intake and 20-40cfm exhaust depending on valve size used. list of people wiki