PRC/Dart 255 runner question
Looks similar to my flow numbers for my PRC Darts.
How would this head take a 200 shot of Nitrous? I plan to add a 200 shot later down the road, who knows how soon, but are the flow numbers that important at that point?
How would this head take a 200 shot of Nitrous? I plan to add a 200 shot later down the road, who knows how soon, but are the flow numbers that important at that point?
Originally Posted by Orange Peel
Looks similar to my flow numbers for my PRC Darts.
How would this head take a 200 shot of Nitrous? I plan to add a 200 shot later down the road, who knows how soon, but are the flow numbers that important at that point?
How would this head take a 200 shot of Nitrous? I plan to add a 200 shot later down the road, who knows how soon, but are the flow numbers that important at that point?
They are still important, but not as important as if it was naturally aspirated..
Ill let you know when mine come in because im going to run a 300 shot profogger on my new aluminum LS2 418cid , My PRC (Dart) stage III heads i ordered from Texas Speed has 255cc intake runners 59cc chambers for 12.7-1 compression with 2.100 int.& 1.60 ext. valves. Cant wait 
Doesn't matter, 313cfm still supports 500rwhp.
More importantly, though, no composite intake will get you close to those numbers.
Plus, I know of at least one person whose heads flow 290cfm @ .600" and he makes 550rwhp with a 246/250 cam at only 5800rpm. Any higher and the heads become a restriction. Yeah, he has 12.8:1 CR, but he is able to run 93 octane. So, as I have seen and learned, I could care less what a head flows - it's not the most important factor in determining power output, it's a guide to picking a cam for a given RPM. More imporant is matching the compression to the cam for maximum power output.
More importantly, though, no composite intake will get you close to those numbers.
Plus, I know of at least one person whose heads flow 290cfm @ .600" and he makes 550rwhp with a 246/250 cam at only 5800rpm. Any higher and the heads become a restriction. Yeah, he has 12.8:1 CR, but he is able to run 93 octane. So, as I have seen and learned, I could care less what a head flows - it's not the most important factor in determining power output, it's a guide to picking a cam for a given RPM. More imporant is matching the compression to the cam for maximum power output.
I will be around 11.5:1 CR, that's about max for here in AZ and our wonderful 91 octane. The cam is a custom grind Ed Curtis cam, .629/.629 lift, can't remember the rest off the top of my head, like 238/244 duration on a 113lsa but recommended intake centerline of 111. Got the Fast 90/NW90, QTP 1 7/8's, 3" true duals, etc, etc, all the supporting mods I need to make the most I can. Damn I hate waiting 
I'm hoping for 500rwhp, anything over that I will be super happy.
I'm hoping for 500rwhp, anything over that I will be super happy.
Originally Posted by Orange Peel
I will be around 11.5:1 CR, that's about max for here in AZ and our wonderful 91 octane. The cam is a custom grind Ed Curtis cam, .629/.629 lift, can't remember the rest off the top of my head, like 238/244 duration on a 113lsa but recommended intake centerline of 111. Got the Fast 90/NW90, QTP 1 7/8's, 3" true duals, etc, etc, all the supporting mods I need to make the most I can. Damn I hate waiting
I'm hoping for 500rwhp, anything over that I will be super happy.
I'm hoping for 500rwhp, anything over that I will be super happy.
