Header gasket port matching
#7
The gasket should not hang into the passage, but having the header and gasket
larger than the head export interface is actually good for preventing reversion.
Artifically enlarging the exhaust port on a head isn't going to help you any.
larger than the head export interface is actually good for preventing reversion.
Artifically enlarging the exhaust port on a head isn't going to help you any.
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#8
And just for those who don't know what "reversion" is, it's when the exhaust pulse travels back up the exhaust/header and back into the head, killing scavenging. If the header flange is larger than the port, it's like the pulse hits a "wall" when it gets back to the port.
#9
TECH Senior Member
iTrader: (36)
And just for those who don't know what "reversion" is, it's when the exhaust pulse travels back up the exhaust/header and back into the head, killing scavenging. If the header flange is larger than the port, it's like the pulse hits a "wall" when it gets back to the port.