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Porting
#5
Not worth doing a lot of work on the ports unless you have decent carburation and exhaust; factory valve springs won't go any/much over 5000 RPM either. As Alan says, getting a really decent shape in the valve throat -the biggest restriction in the port area- really involves increasing the valve size. If you do any work on the inlet ports, the "short side radius"  -which is actually a sharp right angle on factory blocks is where the bulk of the flow happens, so is the best place to be concentrating on. This is a block I did some work on where you can see that there is now a short side radius rather than a near knife edge right angle at the valve throat.

[Image: 33571772758_a25cbbe80a_z.jpg]
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Messages In This Thread
Porting - by Tom Coates - 08-10-2019, 12:37 PM
RE: Porting - by Chris KC - 08-10-2019, 12:50 PM
RE: Porting - by Alan - 08-10-2019, 01:18 PM
RE: Porting - by Speedex750 - 08-10-2019, 02:59 PM
RE: Porting - by Stuart Giles - 08-10-2019, 03:26 PM
RE: Porting - by Special Bits - 08-10-2019, 04:56 PM
RE: Porting - by Bob Culver - 08-10-2019, 08:02 PM
RE: Porting - by Tom Coates - 09-10-2019, 09:15 AM

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