messing around with desktopdyno 2000.
i've got the aluminum L98 heads in there, and was wondering if anyone has some flow #'s on a good set of ported aluminum L98's so that i could adjust my settings.

thanks

 

These were posted by Mark305TBI in one of the posts on here.

Ported AL L98
Lift Int Ex
0.1 56 50
0.2 117 96
0.3 164 130
0.4 199 148
0.5 220 161
0.6 228 170

David

 

those number's seem a little off on the ex. side.
here is a screen shot of what the flow numbers i have look like, according to a file i found off the net....
maybe the file is wrong all the way around?

 

No, those numbers look right for stock L98 heads, aluminum or iron. The exhaust numbers do look a little generous, however. They are not great heads, at all, in stock form.

But they really shine when properly ported. Intake flow numbers can get into the 240 cfm range, and that will support a good 500 hp under ideal conditions.

 

I got my ported L98s from SDPC. They gave me flow numbers for the stockers and for their ported ones.

 

How much did that run you, if you dont mind me asking?

Brian

 

ditto

 

The best numbers I've seen are at http://www.weldtech.com/newproductsframe.html

 

I think they were a bit more than $1,000, brand new. It's been quite a while so I can't remember exactly. Plus, I usually try to dwell on how much money I've dumped into my car...it's just too painful.

Those are more impressive, indeed. I don't think that SDPC ports their L98s very aggresively.

 

These are my numbers off my mildly breathed on Vette Heads. Im running Manley Race - Flo Valves 2.00 intake and 1.56 exhaust and a set of Comp Cam Ls1 918 vale springs.

Intake Lift CFM @ 28 inches
.050 45
.100 83
.200 150
.300 200
.350 215
.400 235
.450 240
.500 245
.550 245
.600 247

Exhaust lift CFM @28 inches
.050 40
.100 70
.200 110
.300 140
.350 155
.400 170
.450 180
.500 185
.550 190
.600 195

 

Here is what the AFR 190 street heads are:


Are the 262/194 really that much better than the 247/195 of Chris B's??
I dont know much about this yet

Brian

 

On the street it is kind of meaningless. Most engines don't have cams that feature over .500 of lift. It is the flow in the lifts below that determines a good street head.

On the track with a full tilt boogie engine, sure!