Just flowed my Dart 200 port with a 2.02 valve after some minor work in the bowl and around the guide and a good valve and valvejob. Here are the figures.

.050 30 cfm
.100 66 cfm
.150 - 102 cfm
.200 - 138 cfm
.250 - 166 cfm
.300 - 195 cfm
.400 - 244 cfm
.500 - 277 cfm
.550 - 286 cfm
.600 - 286 cfm
.700 - 287 cfm

Overall velocity is high and there is very little turbulence at 700 lift. I think a little more work in the bowl and there might be a 290 in it.

 

Did you port them at SAM?

 

Yeah, this is my second port job since I have been there.

 

what kinda dart heads are these?
jeremy

 

Iron Eagle 200cc 2.02, 1.60 w/64cc chambers.

 

Did you do any back flow numbers at low lift?

 

me be gots a set of 200cc sportsman II's. i wish they flowed 290!! lol
jeremy

 

I've seen some sportsman II's flow 315cfm before, they are a pretty good cheap head.

Bret

 

No back flow numbers yet. I'll do that on monday. It will be inline with the valve job.

They flowed like 247 @ .500 stock. I worked the chamber a little and put a good valvejob on it then did some bowl work. My goal for that port is 295 but our bench is pretty stingy compared to some of the shops in the area so they would probably go 295 or more on someone elses bench.

 

Funny thing is we have a cirlce track class up here that uses those heads with no porting and a 2bbl carb and a performer intake. The guys who cheat run head flowing closer to yours.

Rebadging a set of Sportsman II's as the Dart 200's would actually be a good deal and leaving them as cast, they would just about pass inspection then

What did you do for a valvejob? Any specs on that?

Bret

 

Im gonna try a 2.055 valve next and maybe a 2.08 valve on one of the other ports to see what it will change in the flow curve.

The velocity is really nice in that port right now so I think it would be very mean on a street car like a mild 383 or warmed over 350.

Heres the original 2.02 flow numbers with my valve job. The low lift are a couple numbers higher than stock but I dont have the bone stock numbers below .200

.050 29cfm
.100 65cfm
.150 106cfm
.200 132cfm
.250 159cfm
.300 188cfm
.400 232cfm
.500 247cfm
.550 242cfm
.600 244cfm
.700 247cfm

 

.050 30 cfm 29 cfm
.100 66 cfm 65 cfm
.150 - 102 cfm 106 cfm
.200 - 138 cfm 132 cfm
.250 - 166 cfm 159 cfm
.300 - 195 cfm 188 cfm
.400 - 244 cfm 232 cfm
.500 - 277 cfm 247 cfm
.550 - 286 cfm 242 cfm
.600 - 286 cfm 244 cfm
.700 - 287 cfm 247 cfm

What kind of volume are we looking at here?