Looks like your bench (and theirs) is calibrated pretty close.
Small block TrickFlow heads part 1
- Thread starter pittsburghracer
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Those are the closest advertised numbers I have ever seen and honestly I’m not surprised. I started probing my fingers through their ports years before they offered any Mopar heads at the Halloween Classic. They would see me coming and start laughing. Now they offer what three Mopar heads and I have yet to hear someone that is disappointed. Are they slow at releasing things??? Hell ya but it’s right when it does come out. I can’t wait to see what’s next.
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What’s your educated guess on capability with these heads ootb with a good combo, let’s say using one of your current cars, what do you think, ballpark, it would MPH at ootb and then after massaging? You should have more than an Educated guess for sure, what flow numbers etc are you thinking you can get them to? And how would that “likely” translate in MPH in the 1/4,
wow that’s a tough question because honestly I wouldn’t run this head in this condition doing what I want to do. My Edelbrock, speedmaster heads take a bigger valve to get these numbers and having the flow numbers not back up. This is a great head but for making real horsepower I believe it’s choked. And with how the pushrod hole is formed it’s not tube-able like the Edelbrock heads. I can’t honestly give you a number on where it will end up till I find out how much material I have that a can remove. I don’t know where Larry Smiths starting numbers were but he claims to get 330 out of them.
Is that the guy on FB “Flow Tech 2” ??
What really screws me up about his numbers are his exhaust numbers. Check his after porting and TrickFlows advertised numbers
67autocross
A new iron curtain drawn across the 49th parallel
It would be awesome if we could get a few different sets of heads done and send them to someone and dyno them on a common short block/cam combo and see how they compare...especially if the flow number out of the heads are similar
He make any mention of pipe diameter he’s using? (as Trick Flow lists: 1-7/8”)
cookietruck
Well-Known Member
His exh flow as percentage of Int flow starts about 80% then is up to 87% at .200, then falls back down and is 72% and 68% at .500 and .600 lift.
I'm wondering if this is something he is making happen in the exh port?? of course very little info so who knows...
I'm wondering if this is something he is making happen in the exh port?? of course very little info so who knows...
Hard to assume or be specific unless using the exact same pipe on every head but generally speaking if it was a 1-3/4” pipe being used for his numbers, and a 1-7/8” pipe were used what %increase would you think be seen?
for my info I don’t use a pipe because like you said it varies with size so why bother. It does make your flow numbers look better. I know I’ve said it 100 times but honestly I really don’t care about percentages or flow numbers on the exhaust side. I want to see 325 plus FPS airspeed, be a nice quiet port, and I know it will work. Piston travel is helping so if it’s fast and shaped right, it will work.
Rat Bastid
Dunamis Metron
Is the port noisey or quiet? When the air speed gradient is that close, I’d be very leery about what the pinch is doing. You may open up the pinch and skew the air speed in other areas. JMO.
PRH
Well-Known Member
From my bench; ootb, 4.00” bore, no tube on exhaust, .100-.700 lift
The intake port for those airspeeds was very quiet and that was reflected in those flow numbers. The port only had one semi turbulent area which was in the top of the port at the pinch. It wasn’t bad but I could feel and see it while I was checking airspeed. Since my bench is all electronic I will see turbulence with jumpy flow numbers that I couldn’t see on my liquid manometers. Liquid can’t respond that quick.
PRH
Well-Known Member
John, which cylinder are you testing?
I tested #1
I tested #1
A lot of guys, home porters call opening up the pinch porting because its the first thing you see and the easiest to get to. porting is addressing all areas of the port and sometimes require going back and forth this is almost impossible without having access to a flowbench. if i have the time i will flow it again after just opening up "the pinch"
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RedB.
Well-Known Member
John are you going to take before and after measurements of the pinch ? Thanks
yes i can do that. That's a number (width for sure) that i will keep handy so i don't have to get out my sonic checker all the time.
B3422w5
Well-Known Member
buddy of mine ran them on a typical bracket stroker motor. 264/268 Hughes flat tappet,620 ish lift, 3100 ish pound A body, 950 carb, 1 7/8 headers, 8 inch vert, hair too much gear, etc, etc…on a summer day( not good air) car went 10.50’s at 125.
He swapped on a set of airwolf heads, similar day, keeping everything else the same, so as to have a good comparison, car picked up almost 3 mph.
The convertor isnt “right” for either head, so some improvement could be made for sure, but it was a good test regards comparing those two different heads.
Ok now I’m disappointed but I know how to fix this as every other Edelbrock type head has it too. The flow numbers kinda suck without the tube. My low numbers always read low at .100-.200 as I’ve never calibrated it with an orface plate that small and never will. I use a 200cfm plate. It’s a hassle for me by myself holding a tube and flow testing because as soon as you hold the tube on the depression drops and needs raised and I can’t reach it while holding the tube on. For this reason I only tested the port at .500 with two different sizes of plastic pipe. Those numbers are on the far right. The airspeed in the exhaust post is very slow. At .500 lift I had to really do a lot of probing to find 255fps. At .550 I searched hard to find one spot at 261fps. I will be doing some reshaping of the exhaust ports for sure. Time to jump on a yard job then install an intake on my black duster.
PRH
Well-Known Member
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