Mr VIZARD.. Photos

[SpeierRacingHeads]

I watched you video talking about big bowls and bias. Couldn't agree more. Also couldn't agree more that the pinch in a SBC/SBF is way less critical than talked about.

So I thought you might like these. Pictures of a few of my 23 degree ports.

First one is a 265cc 23 degree
Second one is a 205cc 23 degree
Thin line = v2.35PF 205cc
Thick line = v3.00PF 265cc

[289nate]

Any ABA dyno or track testing yet?

[steve cowan]

I watched you video talking about big bowls and bias. Couldn't agree more. Also couldn't agree more that the pinch in a SBC/SBF is way less critical than talked about.

So I thought you might like these. Pictures of a few of my 23 degree ports.

First one is a 265cc 23 degree
Second one is a 205cc 23 degree
Thin line = v2.35PF 205cc
Thick line = v3.00PF 265cc

I am wondering- does the vane at the apex help re-atomize the fuel that separated at the pinch because FPS was to fast ??

[mag2555]

Would I be wrong in assuming that the first depiction is a SBC and the second a SBF?

[SpeierRacingHeads]

Any ABA dyno or track testing yet?

I have 100 sets out there. Lots of dyno and track time.

[SpeierRacingHeads]

I am wondering- does the vane at the apex help re-atomize the fuel that separated at the pinch because FPS was to fast ??

Kind of.. It's a way to tune both side of the fuel curve. Due to height and width of the floor. Also both heads have huge bowls, like 110% of valve.

[SpeierRacingHeads]

Would I be wrong in assuming that the first depiction is a SBC and the second a SBF?

Both SBC

[fordified]

I am wondering- does the vane at the apex help re-atomize the fuel that separated at the pinch because FPS was to fast ??

Kind of.. It's a way to tune both side of the fuel curve. Due to height and width of the floor. Also both heads have huge bowls, like 110% of valve.

When you do a high-port wedge like a comp head do you keep the bowls that big? Do you approach a wedge head differently than a splayed head at the short turn and bowl?

[SpeierRacingHeads]

I am wondering- does the vane at the apex help re-atomize the fuel that separated at the pinch because FPS was to fast ??

Kind of.. It's a way to tune both side of the fuel curve. Due to height and width of the floor. Also both heads have huge bowls, like 110% of valve.

When you do a high-port wedge like a comp head do you keep the bowls that big? Do you approach a wedge head differently than a splayed head at the short turn and bowl?

Most castings you can't in the wedge. The GM 615X, you can some. The 13 degree ProFiler you can (Darin designed it).. A splayed head like an older GM, you can't. Heads like a SB2.2 or Airstrike you can. I will always give it bowl if I can. Always.

Few pics.
1st GM 615X
2nd ProFiler 13
3rd ProFiler Airstrike.
4th GM SB2.2

[fordified]

Kind of.. It's a way to tune both side of the fuel curve. Due to height and width of the floor. Also both heads have huge bowls, like 110% of valve.

When you do a high-port wedge like a comp head do you keep the bowls that big? Do you approach a wedge head differently than a splayed head at the short turn and bowl?

Most castings you can't in the wedge. The GM 615X, you can some. The 13 degree ProFiler you can (Darin designed it).. A splayed head like an older GM, you can't. Heads like a SB2.2 or Airstrike you can. I will always give it bowl if I can. Always.

Few pics.
1st GM 615X
2nd ProFiler 13
3rd ProFiler Airstrike.
4th GM SB2.2

Thanks a lot Chad.

[BOOT]

Still gotta watch DV's vid been working on some vids of my own, review vids. I've always seen how bias makes sense but not gotten down a good understanding of bowl sizing yet. I mean I understand how an enlarged area helps slow it down to turn, just not how to size them exactly.

[1980RS]

What is purpose of the vane in the port floor?

[SpeierRacingHeads]

[blackford]

Very interesting what you've done.

I've watched DVs videos within the last few months and they were very educational. He really is very detail oriented as I am so I appreciated that He has rekindled my interest in porting. I am not a professional...just ported several heads over the years including a few back in the late 70s for myself and friends.

DVs videos motivated me to buy a used DOOE 351w head and do some porting incorporating most of what I did back then and DVs insights and then have it flowed. Reason being that I fully ported a set of DOOE heads for 331 SBF years ago, but I never had them flowed. Their probably 220-230 intake and 170-180 exhaust approximately based on other ported DOOE heads. The engine makes 430 HP @ 6500 and it's still making 410 at 7000. The engine is not radical by any means (street friendly compression and decent SFT cam). Nothing earth shattering, but for a potent street engine in a lightweight Mustang, it is a screamer and a thrill to drive. I have put fear into several passengers over the years.

I measured the intake entry at the pinch point and it came out to about 1.89 cu in. In the runner, there is a min area restriction of 1.63 cu in. so the entry pinch point does not appear to be an issue. Even if you smoothed the hump, you'll only get about 1/16" out of it before you get into the pushrod hole. The only thing worth doing is just to smooth it off a bit and leave it be.

I did increase the runner min area from 1.63 to 1.78 cu in. I also incorporated much of what DV recommends in the rest of the port and I did valve unshrouding using a flow ball and the valve and did chamber prep per DVs video. I raised the roof on the intake and exhaust and blended them in just like I did years ago in an effort to straighten out the ports a bit. I left the short side alone except for smoothing it. I use a Felpro 1262 intake gasket (2.1 x 1.2) and a 1.48 x 1.125 exhaust gasket and the intake manifold and headers were port matched. Heads have 1.94 and 1.60 valves.

Volume went from 140cc intake and 50 cc exhaust to 160cc intake and 60cc exhaust. I believe the exhaust really benefits from removing the thermactor hump, porting and raising the roof to straighten it out. I know looks aren't everything, but it just looks far better than it did stock even though it is only 10 cc larger than stock. Intakes look a whole lot better also.

One of these days, i'll have to take the head in to flow test it and see how I did.

Your work looks excellent. I obviously can't compare, but i'm still learning more and I think i'm improving.

[1980RS]

Thanks, I see what it does now.