mk e wrote:
here's a place to start
50mm TBs
TriY headers
I think I found the right OEM cam data
33/29 valve with flowed head, see data
Now, ideally I would know what the redline is and we could be talking about real flow numbers
Damn, dude, doesn't Lana have enough for you to do? When should I drop the heads off?
8500 is good. I'm expecting I'll eventually get it that fast, but not faster.
CHRFab is the outfit that did most of the speed parts for the Northstar. If they were still in business I'd have ordered their craziest porting package and called it a day. Alan Johnson retired, though. I already have their valvesprings--which are adapted from another application, not custom wound--on my heads. So your graphic that shows them as the MFG is showing already ported flow numbers.
The numbers in the data entry screen look more like what I remember CHRFab's website saying the stock numbers were.
Here's pretty much the last archive of their website:
https://web.archive.org/web/20170825132 ... hrfab.com/Since they shut down, somebody else took up the name, but that shop doesn't do Northstars.
Here's the head work page, with flow numbers:
https://web.archive.org/web/20170904220 ... d_Work.htmAlan Johnson also mentioned on the phone with me that they did a $4k package with "cut down titanium Indy car valves" that was really the bees knees, but wasn't on the website.
I'm not sure if I'd go Tri-Y's in a Fiero... I know I can get equal length 4 into 1 to work. I *think* I can get 180 degree collectors to work, depending on how long the primaries are. The engine has a conventional V8 firing order and is NOT a flat plane crankshaft.
I'll start with a nylon Y2K+ manifold, but I do have a ITB package that someone built for his car... but has ZERO dyno or flow bench evaluation on it. He built it to look cool, then outright GAVE it to me when he moved on to something else; so I'm skeptical it would be any kind of world beater in power production, but maybe it's a good starting point.