milling vs combustion chamber ....
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TECH Junkie
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From: Key West, Florida
milling vs combustion chamber .... is there a benefit to one head over the other:
- both heads flow the same cfm
- both have the same intake runner (and exhaust for that matter) volume
one head is milled to 59cc
one head has the chamber design for 59cc
*assuming both allow for proper PTV clearance**
- both heads flow the same cfm
- both have the same intake runner (and exhaust for that matter) volume
one head is milled to 59cc
one head has the chamber design for 59cc
*assuming both allow for proper PTV clearance**
Thread Starter
TECH Junkie
iTrader: (5)
Joined: Feb 2007
Posts: 3,183
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From: Key West, Florida
what was WHAT milled down from??
these are hypothetical heads that i'm talking about.
but i was referenceing milling 241s down (and in conjunction with the gasket) making a 59cc chamber....like that of the 5.3L heads
these are hypothetical heads that i'm talking about.
but i was referenceing milling 241s down (and in conjunction with the gasket) making a 59cc chamber....like that of the 5.3L heads
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Wouldn't valvetrain geometry be the other thing that is affected?
I.E. a 5.3 head has the same valvetrain geometry as a 5.7 head, but the chamber ceiling is .030 (or .035") lower. (the 5.3s have smaller intake valves). So in rough theory, you can mill a 5.7 head and have the same cc that a 5.3 head has, but now your valvetrain is closer to your cam so your pushrod length will have to be changed. Your intake port to intake manifold will change accordingly too.
That's my 02 cents
I.E. a 5.3 head has the same valvetrain geometry as a 5.7 head, but the chamber ceiling is .030 (or .035") lower. (the 5.3s have smaller intake valves). So in rough theory, you can mill a 5.7 head and have the same cc that a 5.3 head has, but now your valvetrain is closer to your cam so your pushrod length will have to be changed. Your intake port to intake manifold will change accordingly too.
That's my 02 cents
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Verdad Gallardo Wouldn't valvetrain geometry be the other thing that is affected?
I.E. a 5.3 head has the same valvetrain geometry as a 5.7 head, but the chamber ceiling is .030 (or .035") lower. (the 5.3s have smaller intake valves). So in rough theory, you can mill a 5.7 head and have the same cc that a 5.3 head has, but now your valvetrain is closer to your cam so your pushrod length will have to be changed. Your intake port to intake manifold will change accordingly too.That's my 02 cents
I.E. a 5.3 head has the same valvetrain geometry as a 5.7 head, but the chamber ceiling is .030 (or .035") lower. (the 5.3s have smaller intake valves). So in rough theory, you can mill a 5.7 head and have the same cc that a 5.3 head has, but now your valvetrain is closer to your cam so your pushrod length will have to be changed. Your intake port to intake manifold will change accordingly too.That's my 02 cents
Last edited by radkon; May 3, 2012 at 09:25 AM.
