Porting aftermarket heads
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From: Dayton, OH
Porting aftermarket heads The AFR site lists their 260 Mongoose heads as;
"AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers".
Why do they not cast the head with optimum dimensions instead of porting after they are cast?
"AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers".
Why do they not cast the head with optimum dimensions instead of porting after they are cast?
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From: Central Cal.
With any casting there are almost always minor imperfections.
Having said that, it is now proving that as-cast can flow just about as well as CNC porting if the basic port shape is a winner to start with.
Having said that, it is now proving that as-cast can flow just about as well as CNC porting if the basic port shape is a winner to start with.
Last edited by G Atsma; Oct 5, 2024 at 08:50 PM.
Originally Posted by SteveJewels
The AFR site lists their 260 Mongoose heads as;
"AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers".
Why do they not cast the head with optimum dimensions instead of porting after they are cast?
"AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers".
Why do they not cast the head with optimum dimensions instead of porting after they are cast?
Also, the texture left by tooling is beneficial to wet flow and atomization due to boundary layer effect.
The tolerances on machining are far better than casting. You get far more consistent dimensions - I.e. less variability - piece to piece and even port to pet within the same piece.
Also, the texture left by tooling is beneficial to wet flow and atomization due to boundary layer effect.
Also, the texture left by tooling is beneficial to wet flow and atomization due to boundary layer effect.
Originally Posted by 84ta406
I was just going to say the same thing, on anything non DI surface finish makes a difference. How much difference is subjective but there is a reason people like Chad Speier uses a burr finish on some stuff..
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"on anything non DI, surface finish makes a difference."
The "DI" is referencing "Direct Injection"
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I've had good success with smaller unported heads and running more boost pressure no issues with heat or anything and I get better throttle response off idle and lower rpms.