I strut!

Rule of thumb is 20 CFM increase in airflow = 20 hp for a 4 cyl. engine => 30 hp for a 6 cyl. engine.

That argument hold water until you take cnc heads into account

Totally agree. It is so easy to forget what you have done in the other holes when you try to do it all at once. You should look at it like six sandwiches that you want to eat. Take a nibble go to the next one and just keep going around and around till all six are gone. It is the only way to ensure constancy between them all. Keep referring back to the other ones. With core shift you may need to remove less from one area than another (or not touch the area at all) only little nibbles and focusing on the shape will you spot what needs to be touched and what needs to be left alone. Also do the most prone to damage areas last. Starting with trying to go out to the gasket first up, doesn't leave room for errors should the cutter slip while doing another area, or the grinder chuck nut try to take a bite out of it (focusing on the cutter and not paying attention to the grinder itself) , then you have a gouge outside of the mark leading to a cylinder leak.

Right on

THOSE R GOOD TOO

Have fun-THE PORTING WILL DEFINITELY HELP

ME TOO

Why the cringe?

I wish it was that easy!

I did the spark plug boss near the intake

based on gasket?

It's always funny when I see someone I know from other places in my feed. Are you still modding your Fiero?

I sold the Fiero awhile back... replaced it with a 3-series BMW.

Looking at the vid on my laptop (as opposed to smart phone), we can see you removed very little material - BUT, you got 10% or so. I'll bet a little more aggressive work could get you another 5% - streamline the valve guide bosses, smooth out short side radii a little more, and fine tune the intake/exhaust port matching. Really cool gains nonetheless. Great before and after comparison.

there is an easy 15 cfm left in more work that I could do (plus valve job and bigger vales-the BOMB-it flows 300 cfm)

Razor Blade rebuild

Thanks! 😊

🤣🤣 goals man. I think pushing yourself put of your norm is what makes you get better. Do you man!

Every professional, experienced mechanic started out as a backyard hack. It is called learning by doing.

airflow data?

@@richardholdener1727 I wish, no flow bench. There's a guy on here that got 315 cfm with plenty of meat on the bone so to say. Pointers...use stone NOT carbide, stone makes powder carbide makes slivers. (I think that's where the crack LT's ugly truck head began, never heard of that before but it fits better then heat causing cracks rather then warps.) I digress, another tip is the valve seat cut marks. People whom have never seem valve seats installed, wrongly think this is a 4 angle valve job. When the hole for the seat is cut into the head a perfect cylinder shaped hole is made with a drill press, a valve seat is pressed in and cut. There is however leftover of that cylinder shaped hole above the valve seat, this is a flow restriction and in no way a valve seat or it would follow the circumference of the valve rather then the hill of the combustion bowl. There are two other valve angles to KEEP AWAY FROM they reside on either side of the cut seat and help air around the valve. The throat of the exhaust valve boss has like a full centimeter on the inboard side, a talented hand could possibly match the intake and exhaust boss shape...it will be getting thin at that point though. Which brings me full circle to stone over carbide, with stone one can actually hear the thickness of the metal in the tone. Also try a electric rotary tool with a foot pedal, they work like a sewing machine much more instant control, makes going slow easier.

As a question do you think .57 lift would clear stock 8.1l pistons? That's only like .026 bigger then the zz502, not much. Raylar says his 202 is based off the zz502 and that his 203 is bigger. Do you think a comp cams matha thumper would clear?

OK so I've been done with my 8.1L heads for over a week. Can't seem to find a flow bench in maine....help! I CAN drive to NH but that's time and gas. I simply can't believe there is no flow bench in maine. If you have one, and be willing to set up a day...I would love to reassemble my truck, I would also appreciate better eyes then mine inspecting my work before just turning over the block on them. As an aside, on the intake, the runners can shave 4mm off casting over-squish, and extending the oil drain tub on the bottom with a 4in tube the full length has more surface area and air speed then removing the tub and replacing it with a flat sheet simply lowering the entire floor 1 inch. Either way can someone help me find a local flow bench and I'll discuss my 8.1l porting method, as it should flow WAY better.

we do hit the valves with the wheel

it is not worth power-only fitment with big dome pistons

its a dyno shop

184 .500 185 173 .400 183 153 .300 158 112 .200 118 057 .100 054 3800 vs Gt40p stock intake port flows

154 .500 125 148 .400 123 130 .300 115 099 .200 093 048 .100 046 Exhaust flow

The exhaust flow is embarrassing on the gt40p in comparison 😭😭😭

Have you looked at street machine carnage channel? The supermang project is building a pretty stout l67.

@@guyharrison909 I’ll check that out.

Supermang is an absolute nugget. King of mang is where its at (look up 1000hp ecotec) (fullboost channel)

Richard has shown time and time again that whatever makes more power on a naturally aspirated engine also makes more power on a boosted application. Your theory is interesting but from what I've seen on his testing the better overall flow will always make more power.

@@1967davethewave well, if the theory is interesting, why not test it?

I only did 1

The written description under the vid says less than 45 minutes for one port. Assuming he gets quicker on the rest of them it would likely still be a full days work to do all 12.

15:1 is not good

@@richardholdener1727 yeah I'm wanting to get the ECU REMAP ASAP but it's only when I give it heaps! So for know I have to drive normal.

Oh yeah. I'm using AED diagnostics from envyouscustoms and I literally can't find any remapping software for tunerpro RT? I'm wanting to do hp tuners course? Otherwise I will have to pull the ECU out of the car and send to Victoria. Apparently 2 weeks turnaround! ( Apparently) lol 😆

I'm sure he laughed out loud

Why do the heads need to be pinned?

I figured to keep the cylinders centered.

don't worry about surface finish

@@richardholdener1727 I thought if they are ruff it's good to get them smooth and shiny or is just smooth good enough?

TOTAL ENGINE AIRFLOW

Or pump e since this is more of a budget build 🤑🤑 lol

THERE WAS A COMPANY OFFERING AFTER MARKET HEADS-NO LONGER

colorado?

Your cu buff sweat shirt

I'M A DYNO GUY-EVERYTHING NEEDS TO MAKE MORE POWER!

you offering to buy them a new one? if it works why would they replace it?

@@bunter6 When cars were invented, some people still stuck to using horses. Do you want to move forward or stay in one place?

@@PCMenten Your an idiot, more like you want him to get a Mclaren when a Corvette will do? I'd love to own that flow bench.

@@derrickwhite6776 I agree that I’m an idiot, but with a bare minimum of effort, you can make a better flow bench. Derrick, if you learn the difference between your and you’re (and yore) you won’t sound like an idiot.

@@PCMenten Okay, so you got me on the use of the word your, kinda explains a lot about the knowledge you have for flow benches.