Engine Builders talk.
Senior Member
Joined: Jan 2011
Posts: 1,086
Likes: 65
From: CO
Can someone explain what the head cc is and how it relates to piston choice and compression ratio. Im guessing its the combustion chamber volume which means the more highly modified heads have less? What is the stock size on an unmodified head?
Edit: looks like the stock 4.6 head is 49.77cc so I wonder if the 5.4 is the same
Edit: looks like the stock 4.6 head is 49.77cc so I wonder if the 5.4 is the same
Most modified heads a 42cc, it's kinda hard to add more material later on
Yep, it's the size of the combustion chamber in the head. Stock is 42cc as everyone else mentioned. Trick flow has a 38cc head available to tighten up the compression a bit. I'll be doing the 38cc heads and some dished pistons for a 9.2 or 9.3 CR.
Most modified heads a 42cc, it's kinda hard to add more material later on
Most modified heads a 42cc, it's kinda hard to add more material later on
Senior Member
Joined: May 2011
Posts: 10,731
Likes: 172
No need for a lightning crank.. Your factory forged is the same.
Don't see any reason for porting heads if you are going N/A and not looking for huge numbers.
I would go with a very slight dished piston -10 or -7 Compression would be great for a NA enginge with a good set of cams.
Don't see any reason for porting heads if you are going N/A and not looking for huge numbers.
I would go with a very slight dished piston -10 or -7 Compression would be great for a NA enginge with a good set of cams.
Yep, it's the size of the combustion chamber in the head. Stock is 42cc as everyone else mentioned. Trick flow has a 38cc head available to tighten up the compression a bit. I'll be doing the 38cc heads and some dished pistons for a 9.2 or 9.3 CR.
Most modified heads a 42cc, it's kinda hard to add more material later on
Btw is the Navi a 4 or 6 bolt main?
Senior Member
Joined: May 2011
Posts: 10,731
Likes: 172