11 replies to this topic

[claysummers]

After advice on this manifold.


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Doesn’t look right. In thinking about ditching the divider and running this:


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[UCSLE]

chop it , the divider is part of a spread bore pattern

 

The red motor type of that Redline manifold never had it

[claysummers]

Thanks Troy.


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[LJ RB30]

The divider is there to essentially reduce flooding of the center cylinders.
The original Cain manifold didn’t have it but later version’s did. This is basically what everyone has copied since. I’ve got a couple of them.
The divider doesn’t go all the way to the floor of the manifold.
Do not remove it or it will not perform at it‘s best.
Most manifold’s have spreadbore & squarebore bolt patterns.
The shape of the opening/divider at the gasket face may not be perfect for a Quadrajet, which I run, so I have blended it to suit some 35+years ago.

[Muzza]

Slightly off topic, if it bogs down , i have a full set of secondary vacuum springs

[claysummers]

Thanks Trevor and Muzza. The divider is quite shallow in fact. I will blend it to the tapered bore spacer I think.


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[yel327]

The divider is there to essentially reduce flooding of the center cylinders.
The original Cain manifold didn’t have it but later version’s did. This is basically what everyone has copied since. I’ve got a couple of them.
The divider doesn’t go all the way to the floor of the manifold.
Do not remove it or it will not perform at it‘s best.
Most manifold’s have spreadbore & squarebore bolt patterns.
The shape of the opening/divider at the gasket face may not be perfect for a Quadrajet, which I run, so I have blended it to suit some 35+years ago.

 

John used to cast some of Redline's manifolds for them. He showed me the patterns years ago. When he shut up shop Hardiman bought them. As you say that intake will be fine for a 390 vacuum secondary Holley.

[claysummers]

I have a nice old Cain manifold with four bores in the mating surface, but it is 9 port. This is going on a black 12 port in wife’s FB sedan.


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Cheers Byron.


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[LXCHEV]

Also, with the spacer you showed above (the super sucker).... sometimes they work, sometimes they don't. Even though we're talking different engines (I tried one years ago on my small block Chev V8) and lost power (back to back tests on the dyno). All depends on the individual combo.

[yel327]

I have a nice old Cain manifold with four bores in the mating surface, but it is 9 port. This is going on a black 12 port in wife’s FB sedan.


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Cheers Byron.


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My old red 6 in my LX had a CAIN 4BBL intake on it with a 390 Holley. It was nothing flash, just a VB block with a blue crank and rods. 40 thou up, all balanced. A simply 30/70 70/30 Waggot cam, not much different really to a VK EFI cam. 186 Yella Terra head with intake port dividers removed, used Allen headed screws for those head bolts. Electronic ignition, manual (Celica 5spd), electric fans. Extractors and 2" exhaust. It pulled about 125hp or thereabouts at the back wheels. Was a very tractable engine. It had a 3.08 A9X Salisbury in it and 245/60/14 rear tyres. Used to easily pull my heavy clinker ski boat and trailer up boat ramps, and was decent around Amaroo on road tyres. I eventually pulled it out of the LX and stuck it into a 1980 WB tonner painted blue and disguised as a blue motor (it was blue in the Torana too), but had a HZ single Stromberg on it and extractors, and a VK Trimatic with 3.08 rear axle. Lots less power without the 390 Holley but it pulled well, had good torque but would have easily dropped peak 25hp with the Stromberg. 

[claysummers]

Also, with the spacer you showed above (the super sucker).... sometimes they work, sometimes they don't. Even though we're talking different engines (I tried one years ago on my small block Chev V8) and lost power (back to back tests on the dyno). All depends on the individual combo.

I didn’t see your comment until after I went and cut out the divider and got the super sucker plus a 1/4” insulator.


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[LXCHEV]

It’ll be good to see how you go with it.

I never had my engine tuned with the super sucker (I simply whacked it on for a club dyno day one year). In hindsight, should have had a tune done with it on to see what we could have extracted with it. Not entirely sure how much jetting would change when playing with spacers.