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Old 02-16-2005, 13:35   #1 (permalink)
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Flow Figures On Standard 4V Cast Heads

Does anyone know where to get 4v cast flow figures from for these heads.
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Old 02-16-2005, 13:46   #2 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

heres some flow rates i found
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Old 02-16-2005, 14:00   #3 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

Quote:
Originally Posted by xbhoon
heres some flow rates i found
Wow! it easy to see why 4V heads work well with cams over 500' lift, and also why the port fillers would work so well too! Good stuff.
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Old 02-16-2005, 14:30   #4 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

notice the big jump in intake flow above .500
but not much jump on the exh flow to suit
thats y the cam specs are different for each combo
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Old 02-16-2005, 14:40   #5 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

Quote:
Originally Posted by xbhoon
notice the big jump in intake flow above .500
but not much jump on the exh flow to suit
thats y the cam specs are different for each combo
Id like to see the comparison between std 4V and 4V's fitted with inlet/ex filler's. I believe porting 4V's has only minnor effect and can make them worse if not done properly?
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Old 02-16-2005, 22:03   #6 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

George351's engine is very similar to mine, same carby,manifold, fuel pump, he has a slightly smaller cam and a little more compression, it makes 520hp with port filled 4v's.
Mine has 270rwkw with stock heads, just a bit of a clean up on ports, which i believe is around 470 to 480hp at the fly ?
correct me if im wrong but this points around 40hp gain with filled ports.

Quote:
Originally Posted by george 351
My cam is high 250's/mid 265 @50 and low 600's lift
10.8:1 compression
Heads set up by superflow
Internally balanced crank to a bees dick specs
Aftermarket balancer(not sure which brand or what type)
Billet 4 bolt mains on all caps
Oil restrictors and external oil feed to rear
Holley pro strip annihilator ignition
Mallory 140 & 1/2 inch fuel line
1 7/8 primaries into duel 3''
4:11's
Shift at around 7200/7300rpm

I'm happy!

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Originally Posted by falcon coupe
Quick spec rundown as follows:
Standard 4v heads with single groove valves
Cam, Crow solid 272 / 280 duration @ 50, 630 thou lift
10:2:1 comp
Holley 850 dp with 1" spacer (all under bonnet)
Holley strip dominator manifold
Zero deck height
TRW flatop pistons
cold dipped rods
4ma crank (bottom end balanced)
Pacemaker extractors 2" primary with twin 3' x-membered exhaust.
Toploader box
4:88 gears
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Old 02-17-2005, 03:28   #7 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

Interesting chart. You can see why people can ruin a 2V head with a big inlet valve, just not warranted..
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Old 02-17-2005, 08:54   #8 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

Quote:
Originally Posted by 4Vman
Id like to see the comparison between std 4V and 4V's fitted with inlet/ex filler's. I believe porting 4V's has only minnor effect and can make them worse if not done properly?
The Intake stuffer numbers I've seen only knock maybe 2-3CFM off the peak numbers, they have virtually no effect on the flow bench numbers unless you're measuring the velocity in the ports... However the effect on a dyno is very noticeable...
Ditto for the exhaust stuffers I believe...

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Old 02-17-2005, 13:06   #9 (permalink)
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Re: Flow Figures On Standard 4V Cast Heads

I also agree that the intake port stuffers are well worth the effort to install them. I've talked to a few people about the exhaust stuffers and I've heard that they are a very good thing as long as your headers don't turn as soon as they exit the port. Open chassis headers seem to be the best with the exh stuffers. I was told that in a normal production vehicle where the headers turn down and back right off the head, the stuffers won't be much help. Thats just my opinion.
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