What to do with a vic jr plenum/porting

[Guest]

[juiced coupe]

http://professional-products.com/fuel-systems/fuel-rails/professional-products-fuel-rails-for-ford-351w-302-intake-manifolds

[David Claflin]

I actually have an extra set of edelbrock fuel rails, I was looking last night how to make them work on this vs. buying another set.

[David Claflin]

I was mocking this up tonight and the pro products intakes have a tab on the front and back runners so the fuel rails can be attached. This intake of mine doesn't have them, so I could either fab up some tabs and have them welded on, or return these things and use the extra set of edelbrock fuel rails I have. Both would require some degree of fabrication to make them work.

http://professional-products.com/intake-manifolds/small-block-ford/small-block-ford-hurricane-polished-efi-version

[David Claflin]

Got some pics of this turd

port

[David Claflin]

Fuel rails are ziptied on so I can fab mounts for them.
1262 gasket just for comparison's sake


Stock gasket

[jayh]

you just fab tabs that go under the  bolts and then drill the bottom of the rail

[David Claflin]

you just fab tabs that go under the  bolts and then drill the bottom of the rail

There's  couple ways to do this, I was going to use the way that would involve no other holes in the fuel rails. I had actually started to go one route by checking four of the intake bolts in the lathe and truing the top, then drilling and tapping the bolt from the top so I could mount the rail brackets to those, but then decided I'd rather not drill another hole in them and will just fab some brackets to weld on, and use the original holes. I'll get pics up when it's done. I've got some other projects I've got to finish before I start butchering this up.

[tmoss]

Good job, looking forward to seeing results.

[David Claflin]

I think it's ready to go back to the welder for welding up the fuel rail mounts. I opened up the ports to match the edelbrock heads on my 306 that was in the red car. I cut out some of the flashing between ports, just because, and did some work as suggested on the plenum. Any more suggestions let me know.

[David Claflin]

Entrance to ports through the plenum

[Jeff351w]

I can't tell if it's the pic angle or what, but there appears to be a small ridge at the roof entrance to the corner ports in the last pic.  Is that intended or should it have more of a radius?  Or is it not a true representation of the entrance?

I'm asking not criticizing David.  You've done a nice job with that intake.

[David Claflin]

I can't tell if it's the pic angle or what, but there appears to be a small ridge at the roof entrance to the corner ports in the last pic.  Is that intended or should it have more of a radius?  Or is it not a true representation of the entrance?

I'm asking not criticizing David.  You've done a nice job with that intake.

I think it's just the way the picture is, plus the ports kind of lean toward the turn as they make the turn to the head, so one side is a little lower than the other. Running a finger down it feels relatively smooth, but looks peculiar in the pic.

[David Claflin]

I put my turd on the dyno the same day as my son's. I first ran it with a vic jr, and an elbow, then swapped the elbow for a 4 hole throttle body. The elbow made a bit more power at the top end only, but the 4 hole throttle body made more average power and torque. I used a stock DB1 processor, and it worked much better with my 306 and Jay cam than it did with the B-cam, all hail B-cam
The engine now in it  is the 1986 flat top with valve reliefs, and a set of mildly ported GT40s, B cam, cobra 1.7s, and 1 3/4 longtubes, full 3" exhaust. I'm going to swap the ported truck lower, with my slightly modified Holley SMII upper, should have some track results next weekend.

[CDW6212R]

I put my turd on the dyno the same day as my son's. I first ran it with a vic jr, and an elbow, then swapped the elbow for a 4 hole throttle body. The elbow made a bit more power at the top end only, but the 4 hole throttle body made more average power and torque. I used a stock DB1 processor, and it worked much better with my 306 and Jay cam than it did with the B-cam, all hail B-cam
The engine now in it  is the 1986 flat top with valve reliefs, and a set of mildly ported GT40s, B cam, cobra 1.7s, and 1 3/4 longtubes, full 3" exhaust. I'm going to swap the ported truck lower, with my slightly modified Holley SMII upper, should have some track results next weekend.

It's good to hear that you are making lots of changes to test out, I hope you get it running very fast, and are happy with it too.

What two TB's did you compare, and I'm assuming  the one with the elbow was a big 90mm plus size? I'm asking also because I'm wondering what size ballpark I should be in for a 351 Clevor I want to build. I will use an elbow so I can partially mount an old 70's air cleaner on top. I haven't seen an elbow with an angle to match the old snorkel inlet part, I may have to make such a thing. So what's the right TB size to feed a 6000-6500rpm 351? The intake I'll use is a big single plane like the Victor Jr etc.

[David Claflin]

What two TB's did you compare, and I'm assuming  the one with the elbow was a big 90mm plus size?

Yes 90MM with a 6061 elbow, and then a 4 hole mass flo 1000 cfm throttle body like this one
http://www.promracing.com/parts-accessories/throttle-bodies/1000-cfm-throttle-body-with-tps.html