98-LS1

iTrader: (4)

I started on my porting and polishing project last night and it looked like the intake walls were pretty thin stock. I was able to port match them and smooth out the rough texture but I didn't want to take too much material away. I think these heads will make some good power, I'm having them milled
.018" in order to get 10.5:1 compression. What has been the best as far as flow numbers are concerned that people have achieved with these heads?

vanilla89

iTrader: (8)

hears the flow numbers for my old 241 ported by Lloyd Elliot

int.exh
.050... 44-34
.100... 74-57
.150...110-76
.200...142-92
.250...174-119
.300...207-135
.350...235-154
.400...254-174
.450...273-190
.500...286-201
.550...302-213
.600...311-227

now i have some dart 225's that are ported,and flow a lot more than these

00BlueTA

iTrader: (8)

Dont open them up to much because you will lose air vilocity in the intake runners, which is needed for small displacement engines(5.7). All I did was clean up the walls to make them smoth and blended the bowls.

Formulated

iTrader: (16)

So how well did this work for you?

00BlueTA

iTrader: (8)

I didnt bench flow the heads so I have no idea what they flowed. I also changed my cam from a 224 114lsa to a 232/234 112lsa. With the heads that I ported and the cam I picked up 45 rwhp at 6500 rpm. I lost about 10rwhp under 3500 but that cam is supposed to make power at high rpm. The tuner said I probably wouldnt have lost anything if I milled the heads but I was affraid of ptvc. I should have milled the heads and used a thicker gasket.

Studytime

iTrader: (15)

... all the way to accomodate a 2.100" valve.