noted ..
as for an idea what's involved both effort and cost wise .. this guy would have a valid opinion
to bad for us he makes ford 2.3stuff
https://www.youtube.com/watch?v=pv6h9auhMPQ
what does a masi flow at 500 and 600 lift? it looks really good at 350 lift according garys info from back in the day.
honda k series does 307/316 at 500/600 lift intake and 207/211 exhaust.
masi exhaust looks pretty good compared for the exhaust side but im curious what the intake does.
if you interpolate the chart i saw, the k20a2 does around 277 at .350 lift intake and 198 at .350 exhaust.
stock k20a2.
Intake
Lift CFM
.100 107.79
.200 196.52
.300 261.67
.400 294.65
.500 307.84
.600 316.64
Exhaust
.100 46.07
.200 122.55
.300 193.59
.400 203.86
.500 207.41
.600 211.82
so the exhaust seems better on a masi head but the honda intake smokes it.
hence the discussion about a custom head with honda style ports.
Brian
Originally Posted by turbovanman
I know flow numbers are just a tool to see if what you changed made improvements. But my exhaust flows 237@.450 lift and intake 302@.450. I've never looked at stock k numbers. But I know cnc k's exhaust and intake flows a lot more, and now they have the billet head and new aftermarket cast heads. So options are endless.
Why does it matter what a head flows at a lift that's pretty much physically impossible? I haven't checked yet (Rick Diogo could speak to this maybe), but I don't think the Masi can get a valve .500 off the seat. There's a few reasons I say that, but there's physical limitations in the valve train area that will cap what can be done.
I'd rather have fat duration at a decent flow at a lower lift than a huge peak number and nothing in between ruining valve springs...that's just me.
Having had Rick's head in my posession for a while I can attest that .460-.470 lift has been attained. A whole bunch more duration than stock too. You have potential piston to valve as well as valve to valve issues running this kind of lift in a Masi head. Even assembly before timing belt is installed needs to be done with care. As earlier mentioned, bucket bores need to be modified for increased lift and duration of camshaft.
Todd
What are you talking about not possible???? You don’t see me posting numbers at one inch. My crane 24’s are .453 lift, ,450 is a real number. 👀
Todd, I actually knew about the valve to piston and valve to valve issues. I just didn't know where that started happening, especially because we do know that stock lift is something like .330"? I also know about the mods that need to be done in order to get much past stock (bucket bores being relieved, etc).
As I just stated to Todd, I didn't exactly know where the Masi started having mechanical interference. I knew more than stock (a LOT more) could be achieved, I just didn't know how much. I was specifically talking Masi, not the other heads as I do know A420/2.4 heads can get up in that range.