Awesome progression on the manifold! I think most people (me included) underestimate the intake manifold as a restriction on a good flowing set of heads. I also wanted to point out something that i noticed on my 454 Marine engine, the shallow side of the plenum (upper runners) has only like 1/2" of vertical depth from the top of the runner to the carb base ( top left of 3:10 is good example ). My quadrajet secondaries are huge and hang down into the plenum over an inch, effectively blocking a portion of the rear upper runner. A spacer is definitely a must to bring the butterflies up and out of the port.
Lots of time you have invested there. Humbly, i tried to streamline a C5 cast iron 4bbl manifold back in the early 80's. Just to radius the ssr in the plenum took many hours. Engine was a 306. 360hp at 5800rpm. 21mpg with a c4 and 2.79 rear gear. Car was very streetable and fast (69 Fastback). Fun times back then. Thanks for making these informative videos. Happy New Year.
Have you ever tried to run a spacer backwards? One of those plastic spacers installed pointy side up actually made gains for Eric Weingartner. Ask him about it.
I always liked a radius on top of my center divider instead if a knife edge. My thoughts are that the sharp edge slows the air from crossing from the opposite plenum. Your thoughts?
After finalizing a dual plane like this have you ever had one extrude honed or is it just not worth it because i smooths out to much to keep the fuel whipped up?
Excellent work!!! I think the flow change with the spacer for cyl 7 makes me wonder if the spacer is redirecting the air flow … wondering if an open 1 inch spacer would correct that..
I am sorry, but I can't agree with this making any low speed torque, especially below 3500 rpm. I have yet to see that large cutout in the divider make any torque, and only a few more horsepower at ultra high rpm. Every dyno test I have participated in with dual plane intakes had a huge dip in the torque curve with that cut down. My EMC engine making over 613hp made the best torque with a regular divider in the dual plane intake at 592hp, and 613hp with single plane intake. I hope you can prove me wrong.
You Sir are a virtuoso of the carbide.
👍👍
@@hotrodray6802 Thanks!
You did an amazing job equalizing the runners. . that a impressive .the numbers are impressive too.good job sir
@@clarkmcmahan1595 Thanks Clark
Awesome progression on the manifold! I think most people (me included) underestimate the intake manifold as a restriction on a good flowing set of heads. I also wanted to point out something that i noticed on my 454 Marine engine, the shallow side of the plenum (upper runners) has only like 1/2" of vertical depth from the top of the runner to the carb base ( top left of 3:10 is good example ). My quadrajet secondaries are huge and hang down into the plenum over an inch, effectively blocking a portion of the rear upper runner. A spacer is definitely a must to bring the butterflies up and out of the port.
@@robtdougherty Good point!
It was cool t see ur manifold to perform well Charlie
@@rickyfulks6656 I was thrilled! Thanks
Lots of time you have invested there. Humbly, i tried to streamline a C5 cast iron 4bbl manifold back in the early 80's. Just to radius the ssr in the plenum took many hours. Engine was a 306. 360hp at 5800rpm. 21mpg with a c4 and 2.79 rear gear. Car was very streetable and fast (69 Fastback). Fun times back then. Thanks for making these informative videos. Happy New Year.
@@rennypizarro4432 Tons of work no doubt. That was a good runner. Happy New Year!
Outstanding Charlie. A++++. I can see a good flat torque curve.
@@dondotterer24 Thanks!
Great video
@@SalterRacingEngines Thanks Brian!
Thank you for sharing this!
@@blkcoupequattro You are welcome
Have you ever tried to run a spacer backwards? One of those plastic spacers installed pointy side up actually made gains for Eric Weingartner. Ask him about it.
@@rolandotillit2867 Never
I always liked a radius on top of my center divider instead if a knife edge. My thoughts are that the sharp edge slows the air from crossing from the opposite plenum.
Your thoughts?
@@slicepizza3263 Mine is offset to add air to upper H of plenum. Thanks
Nice work 👍🏻
@@merrittmagruder3122 Thanks
After finalizing a dual plane like this have you ever had one extrude honed or is it just not worth it because i smooths out to much to keep the fuel whipped up?
@@pirateshipping817 Not a fan of extrude hone. Takes material in the wrong places. Thanks
Excellent work!!! I think the flow change with the spacer for cyl 7 makes me wonder if the spacer is redirecting the air flow … wondering if an open 1 inch spacer would correct that..
Stay tuned!
@ thanks
I am sorry, but I can't agree with this making any low speed torque, especially below 3500 rpm. I have yet to see that large cutout in the divider make any torque, and only a few more horsepower at ultra high rpm. Every dyno test I have participated in with dual plane intakes had a huge dip in the torque curve with that cut down. My EMC engine making over 613hp made the best torque with a regular divider in the dual plane intake at 592hp, and 613hp with single plane intake. I hope you can prove me wrong.
@joecraine4660 It will take a hit below 3500 but it may not be that bad. We will find out. Thanks
There is lot of thinking and hand fatigue
@@MP-pz9oe Nah. Hands are fine. Thanka