5.4 wright ups?

scp616 · December 6th, 2010, 11:36 AM

03+ cobra heads? I have 2 sets of tumble port heads, I was going to use a set, but a build book I have has the flow bench info for every head and the navi heads seemed to be a lot better... even though they have the same size valves. The intake ports looked a bit larger, I haven't taken the exhaust manifolds off yet to check out the exhaust ports.

DickH · December 6th, 2010, 02:39 PM

navi heads might flow better than 99-01 heads, but unported and for NA use 03+ is better.

scp616 · December 6th, 2010, 02:57 PM

Ive already ported the intake a bit, and i'll be porting whatever heads I go with as well. I'll probably go NA for a while, but i'm dropping the compression to around 9 to run either nitrous or boost later. If the navi heads flow better, then what's the advantage to the tumble port heads?

DickH · December 6th, 2010, 06:45 PM

Navi ports are too big, you lose velocity.

December 6th, 2010, 11:36 AM	#41
scp616 Regular 2002 Mustang GT Join Date: Mar 2009 Location: SC Posts: 326 iTrader: 0 reviews	03+ cobra heads? I have 2 sets of tumble port heads, I was going to use a set, but a build book I have has the flow bench info for every head and the navi heads seemed to be a lot better... even though they have the same size valves. The intake ports looked a bit larger, I haven't taken the exhaust manifolds off yet to check out the exhaust ports. __________________ 02 GT --> long tube headers w/ x pipe and flow masters, throttle body w/ intake plenum, cold air intake, short throw, 255 nitto 555's all around, 373 diff gears, 2 inch lowering kit w/caster camber plates, sony radio working with stock system

December 6th, 2010, 02:39 PM	#42
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,188 iTrader: 2 reviews	navi heads might flow better than 99-01 heads, but unported and for NA use 03+ is better. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

December 6th, 2010, 02:57 PM	#43
scp616 Regular 2002 Mustang GT Join Date: Mar 2009 Location: SC Posts: 326 iTrader: 0 reviews	Ive already ported the intake a bit, and i'll be porting whatever heads I go with as well. I'll probably go NA for a while, but i'm dropping the compression to around 9 to run either nitrous or boost later. If the navi heads flow better, then what's the advantage to the tumble port heads? __________________ 02 GT --> long tube headers w/ x pipe and flow masters, throttle body w/ intake plenum, cold air intake, short throw, 255 nitto 555's all around, 373 diff gears, 2 inch lowering kit w/caster camber plates, sony radio working with stock system

December 6th, 2010, 06:45 PM	#44
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,188 iTrader: 2 reviews	Navi ports are too big, you lose velocity. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

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