4v build Valve unshrouding.

p4ndiamond · August 23rd, 2012, 12:45 AM

I keep hearing about this but how is it done/ what do i need to have done to my heads and or block to do it.

These are B heads . I plan to cam and supercharge them .

SWEET2KSTANG · August 23rd, 2012, 01:11 AM

bore and leave stock size valves in it. the 4v isnt in need of large lift, especially under boost.

p4ndiamond · August 23rd, 2012, 01:47 AM

Would 30 over bore help on the shrouding ?

Tang Stang · August 23rd, 2012, 10:36 AM

A 0.030" overbore is better than nothing, but it isn't going to make much difference. Are these the '93-'95 heads or are they the '96-'98 heads?

All B heads are not created equal - Ford Mustang Forums : Corral.net Mustang Forum

na svt · August 23rd, 2012, 01:10 PM

4vs don't suffer from shrouding like 2V engines. The chambers can't be opened up because they are already the size of the bore and overboring does little to increase flow. Going to a 3.7" bore increases flow a little but the biggest gains are in opeining up the valve seats.

Restrictive valve seats - SVTPerformance

Going with .5mm oversize valves and opening the seats properly to work with them offers good gains but, this isn't needed whn adding a supercharger. 1mm oversize valves require new seats.

p4ndiamond · August 23rd, 2012, 06:44 PM

These are from a 98 mark VIII

also i was thinking of getting the cams ground by HP . Is that a good idea. i just want them to be more aggressive and pick up gains out of them .

p4ndiamond · August 23rd, 2012, 11:57 PM

Interesting information there

August 23rd, 2012, 12:45 AM	#1
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 13.4@103.95/ 2.12 60ft Join Date: May 2010 Location: New Orleans Posts: 2,021 iTrader: 0 reviews	4v build Valve unshrouding. I keep hearing about this but how is it done/ what do i need to have done to my heads and or block to do it. These are B heads . I plan to cam and supercharge them . __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

August 23rd, 2012, 01:11 AM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,856 iTrader: 8 reviews	bore and leave stock size valves in it. the 4v isnt in need of large lift, especially under boost. __________________ project warhorse under construction wagon burner built! track times coming soon!(04 lightning) being built by MP2 Performance follow shop builds on facebook at: MP2 Performance

August 23rd, 2012, 01:47 AM	#3
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 13.4@103.95/ 2.12 60ft Join Date: May 2010 Location: New Orleans Posts: 2,021 iTrader: 0 reviews	Would 30 over bore help on the shrouding ? __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

August 23rd, 2012, 10:36 AM	#4
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 2,894 iTrader: 2 reviews	A 0.030" overbore is better than nothing, but it isn't going to make much difference. Are these the '93-'95 heads or are they the '96-'98 heads? All B heads are not created equal - Ford Mustang Forums : Corral.net Mustang Forum __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

August 23rd, 2012, 06:44 PM	#6
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 13.4@103.95/ 2.12 60ft Join Date: May 2010 Location: New Orleans Posts: 2,021 iTrader: 0 reviews	These are from a 98 mark VIII also i was thinking of getting the cams ground by HP . Is that a good idea. i just want them to be more aggressive and pick up gains out of them . __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

August 23rd, 2012, 01:10 PM	#5
na svt 4v Know-it-all Join Date: Jan 2011 Posts: 994 iTrader: 0 reviews	4vs don't suffer from shrouding like 2V engines. The chambers can't be opened up because they are already the size of the bore and overboring does little to increase flow. Going to a 3.7" bore increases flow a little but the biggest gains are in opeining up the valve seats. Restrictive valve seats - SVTPerformance Going with .5mm oversize valves and opening the seats properly to work with them offers good gains but, this isn't needed whn adding a supercharger. 1mm oversize valves require new seats.

August 23rd, 2012, 11:57 PM	#7
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 13.4@103.95/ 2.12 60ft Join Date: May 2010 Location: New Orleans Posts: 2,021 iTrader: 0 reviews	Interesting information there __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

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