I have your head porting & flow test book & have read it cover to cover but hearing you explain the effects has greatly increased my knowledge. I have been porting my own heads for 30+ years & have learnt more just by watching your video
Hello Mr. Vizard, I’m working on a set of GT-40 heads, GT-40 lower and upper intake for my 1993 mustang. I can’t thank you enough for your kindness in sharing this very important information when porting and flowing an engine combination. I have been building engines for a very long time and now I realize what I’ve been doing wrong. I feel like I’m starting over from scratch but that’s OK because now I’m taking my time and doing it the right way.
Been porting heads for 30 years but without a flow bench .. I know enough about it to make large improvements over stock heads but I know well enough not to go to far in depth to make major drastic changes or open up the ports to a large degree without using a flow bench to gauge results .. In other words I cannot take advantage of a lot of this guys tips because he is pretty much porting every last ounce of power out of the heads... If you are going to take your porting to this degree without his skill and knowledge buy a couple spare heads as cores because you are going to make some paper weights.
You are the most interesting bloke to listen to on TH-cam. I’ve never ever seen knowledge like this in my life. I’m glad your teaching people about this. What an art. Well done
Thanks for doing this i have read all your books and applied your knowledge to my engine's over the years and are about to start porting a set of big block chev edelbrock performer rpm oval port heads.
Good stuff, and thanks for sharing. I don't have even 10% of the experience, but one of the things good modern chambers seem to present is how they are shaped in relation to the intake: it opens up like a scroll housing does for a fan - something in the neighborhood of 90 to 110 degrees as the valve curtain sees flow. But unlike a scroll housing, the surface tilts away along the area of its expansion, in a compound effect. Any idea what optimum layback angle [start & stop] is for say... an 18 degree vs. a 23 degree sbc combustion chamber?
I had dreams of head porting in my fluid mechanics class. That's why I paid so much attention. Just never had a chance to apply it like you are. This is interesting! Have you actually designed mass market heads? You could make a pattern for each engine and make money on them.
I have to admit that you are the best to going into detail.. I do have 1 question for you if you can find the time to answer. The combustion chamber should that be mirror polished or lightly sand blasted for air fuel mixture ? I hear that it should be blasted but then I heard that this could cause hot spots ? What would you recommend when I polish it is like a mirror finish but when I sand blast it's just lightly to cause turbulence for the mixture I also heard of sand blasting the top of the piston as well for mixing the air fuel... My exhaust ports are polished like mirror ...you have refined my knowledge quite a bit I have done a couple heads allready and have noticed a big difference I found a set of Oldsmobile "B" heads that I would like to work on I have "C" heads on the car now ..
I just purchased a set of Edlebrock E 200 heads for my 383 build Are these heads similar to what you are working on now in this video and how do you think they will perform love your videos and your knowledge?
Amazing stuff, to bring up an idea from previous How to Make H.P. On the intake valve with cams of 0.5 lift or less, i was using 20, 30 (seat), 45 , 60. The seat was the same except for a final 75 degree plunge cut. Also ,A/R headers, the cones after the flange, would it be considered part of the port or separate ? Thank You SO much , Dale,from Alberta , Canada
Sir, I have a problem and a question. I built a 383 Gen2 SBC stroker. All new parts. I primed the engine and it runs about 65 lbs oil pressure. I have a hydraulic roller cam. The issue I am having is that I can’t seem to quite the rocker arms down.(1.6 Comp Cams, as well as the lifters and cam). I can actually push down on some of the pushrods and they compress. This doesn’t seem right. Do hydraulic lifters bleed down? I don’t think they should. Sounds like defective lifters, but I am no expert. What do you think? Thanks!
Pleasure to watch, But this kind of knowledge is not for everyone, i've never seen in uk a shop with a flow bench, if someone is porting heads, then it's more often by feel/experience/dyno results, unfortunately. Love the videos.
I have your head porting & flow test book & have read it cover to cover but hearing you explain the effects has greatly increased my knowledge.
I have been porting my own heads for 30+ years & have learnt more just by watching your video
Come on guys this wonderful guy is sharing his wealth of knowledge for free, give him some likes, shares and comments.
Thank you Sir. Been watching all day after I watched the first good stuff.
Hello Mr. Vizard, I’m working on a set of GT-40 heads, GT-40 lower and upper intake for my 1993 mustang. I can’t thank you enough for your kindness in sharing this very important information when porting and flowing an engine combination. I have been building engines for a very long time and now I realize what I’ve been doing wrong. I feel like I’m starting over from scratch but that’s OK because now I’m taking my time and doing it the right way.
Love to see check out a good Cleveland head
Thank you for what you do..
i like..( Brazil )
Great video
Thanks, David! Love this content. Undercutting the seat makes sense now that you've explained the flow path.
Been porting heads for 30 years but without a flow bench .. I know enough about it to make large improvements over stock heads but I know well enough not to go to far in depth to make major drastic changes or open up the ports to a large degree without using a flow bench to gauge results .. In other words I cannot take advantage of a lot of this guys tips because he is pretty much porting every last ounce of power out of the heads... If you are going to take your porting to this degree without his skill and knowledge buy a couple spare heads as cores because you are going to make some paper weights.
Excellent! Thank you for ditching the creepy music. Mr. Vizard is much easier to understand now.
Great fan since "How to Modify Ford Sohc Engines by David Vizard"
You are the most interesting bloke to listen to on TH-cam. I’ve never ever seen knowledge like this in my life. I’m glad your teaching people about this. What an art.
Well done
Thanks for doing this i have read all your books and applied your knowledge to my engine's over the years and are about to start porting a set of big block chev edelbrock performer rpm oval port heads.
Awesome
Glad to find your channel. I have several of your books.
Excellent, thank you.
I've read a few of your books, and love these videos. thanks for sharing.
Like your books, Excellent.
Thank you. This is quite informative. Ronnie.
Thanks David.
Good stuff, and thanks for sharing. I don't have even 10% of the experience, but one of the things good modern chambers seem to present is how they are shaped in relation to the intake: it opens up like a scroll housing does for a fan - something in the neighborhood of 90 to 110 degrees as the valve curtain sees flow. But unlike a scroll housing, the surface tilts away along the area of its expansion, in a compound effect. Any idea what optimum layback angle [start & stop] is for say... an 18 degree vs. a 23 degree sbc combustion chamber?
THANK YOU IM LOOKING FORWARD TO IT
I had dreams of head porting in my fluid mechanics class. That's why I paid so much attention. Just never had a chance to apply it like you are. This is interesting! Have you actually designed mass market heads? You could make a pattern for each engine and make money on them.
I have to admit that you are the best to going into detail..
I do have 1 question for you if you can find the time to answer. The combustion chamber should that be mirror polished or lightly sand blasted for air fuel mixture ? I hear that it should be blasted but then I heard that this could cause hot spots ? What would you recommend when I polish it is like a mirror finish but when I sand blast it's just lightly to cause turbulence for the mixture I also heard of sand blasting the top of the piston as well for mixing the air fuel... My exhaust ports are polished like mirror ...you have refined my knowledge quite a bit I have done a couple heads allready and have noticed a big difference I found a set of Oldsmobile "B" heads that I would like to work on I have "C" heads on the car now ..
I just purchased a set of Edlebrock E 200 heads for my 383 build Are these heads similar to what you are working on now in this video and how do you think they will perform love your videos and your knowledge?
Amazing stuff, to bring up an idea from previous How to Make H.P. On the intake valve with cams of 0.5 lift or less, i was using 20, 30 (seat), 45 , 60. The seat was the same except for a final 75 degree plunge cut. Also ,A/R headers, the cones after the flange, would it be considered part of the port or separate ? Thank You SO much , Dale,from Alberta , Canada
Thank you Mr. Vizard!
Thanks!
HELLO MR VIZARD , THANKS FOR ANOTHER GREAT VIDEO, ARE YOU GOING TO HAVE ANY CLASSES THIS YEAR, THANKS AGAIN
Yes.
Could well be the last week of May or beginning of June but we have to see how the Covid 19 injections go.
DV
It looks like the chamber has gone back to the 1960's style?
Sir, I have a problem and a question. I built a 383 Gen2 SBC stroker. All new parts. I primed the engine and it runs about 65 lbs oil pressure. I have a hydraulic roller cam. The issue I am having is that I can’t seem to quite the rocker arms down.(1.6 Comp Cams, as well as the lifters and cam). I can actually push down on some of the pushrods and they compress. This doesn’t seem right. Do hydraulic lifters bleed down? I don’t think they should. Sounds like defective lifters, but I am no expert. What do you think? Thanks!
If you can get a 3/16 ball, you can use a 3/16 drill bit shank.
You could but it is far from as good for the job. Try a set of inside calipers with the tips modified to suit.
DV
@@DavidVizard thank David I'll try that next time
David, where do you get the "flow-ball" gauges? I've been looking for them, but cannot find anything that look like what you have. Thanks!
Спасибо за очень интересные видео 👍
Pleasure to watch, But this kind of knowledge is not for everyone, i've never seen in uk a shop with a flow bench, if someone is porting heads, then it's more often by feel/experience/dyno results, unfortunately.
Love the videos.
I’m in the uk and have a bench, though I agree I seem to be in the minority.
Like👍
I’m still looking for the love button!!
When you do the 3/16 deshrouding as shown here I find it looks similar to a good cnc head.
👍