• Hello Guest, welcome to the initial stages of our new platform!
    You can find some additional information about where we are in the process of migrating the board and setting up our new software here

    Thank you for being a part of our community!

Pushrod engine intake Q's

AndrewNance

Amateur hour!
Joined
Oct 24, 2011
Location
Winston-Salem, NC
So I'll embarrassingly admit that I forgot my stock B18 intake and exhaust manifolds were actually one piece.

Yeah, so is there anywhere to find a separate, intake-only manifold so that I can run an aftermarket header?

Is it possible to have a metal shop separate the two and grind the intake manifold down flat? I mean the two manifolds obviously can't run together so i seems as if the exhaust part of the piece could just be cut off. Any opinions?
 
Sounds like you have a B20 siamese manifold.
You can cut that in half and run it with a B18 intake or do what most people do run it with a late B20 EFI exhaust manifold.
 
I've got a Stahl header I bought from MikeJr a while back that I want to use after I get it ceramic coated. I've had those manifolds and carbs off several times and I'm kind of ashamed that I went out this morning expecting to pull the intake and leave the exhaust there :oops:
 
Yep, it is possible to saw them in half.

Or get on ebay and find a B18 aluminum intake manifold.

The dual downpipe OEM manifolds actually flow very nicely. Unless you're highly modified it's possible it would be better than a header. What header were you looking at?
 
I searched Ebay for a while but all I found was a B20 K-jet intake and an intake with two DCOEs strapped to it for $1500. The header I have is a Stahl.
 
Boat intakes for the B18/20's are two-piece. Here's one for $38.99 OBO.Here's one for $22 OBO. Here's one for $50 with dual down drafts included! Granted, these are designed for use with Solex carbs, but I don't see why an adapter plate would be hard to find or fab. Just some ideas:e-shrug:
 
Boat intakes for the B18/20's are two-piece. Here's one for $38.99 OBO.Here's one for $22 OBO. Here's one for $50 with dual down drafts included! Granted, these are designed for use with Solex carbs, but I don't see why an adapter plate would be hard to find or fab. Just some ideas:e-shrug:


Damn, at that price I'd buy one of those just to see if they'd work with SUs. The only problem is that the ones for cars have a port for the PCV breather and two mounting holes for the carb linkage to attach to.

Edit: You know what you should do is buy one of those and I'll give you those SUs you traded me back and you can make a boat car for your son too! No more K-jet MPG bull****!
 
Damn, at that price I'd buy one of those just to see if they'd work with SUs. The only problem is that the ones for cars have a port for the PCV breather and two mounting holes for the carb linkage to attach to.
It wouldn't be hard to tap the backside of the manifold to allow for PCV or mounting points. That's exactly what I did for mine. My mani has the log(for lack of a better term) that joins the two plenums(?) and I tapped into that for vacuum ports and mounting points.
 
I don't think you can lay SU's on their side and expect them to work properly, even if you can tilt the float bowls on an HS6. The oil will pour out of the dampers.

The price is a bit high on the B18 manifold, but look around some, you should be able to find one for less.
 
Well here it is:

nKDLL.jpg


So I'd have to have the mount for the linkage welded onto it rather than just tapped into it because I'm not sure how well the linkage would work if I moved it, as far as binding up and what not. Basically, I'm not sure if the linkage is flexible enough to adapt to that. I'd be willing to give it a whirl but I'd still probably have as much money in paying someone to weld that as I would in just having mine split in half.

Then there's the differences between SUs and Solexs which I have no idea about. That's where I'd need the custom Solex-to-SU adapter plates which I'm sure would be $$$. Why couldn't there just be an SU-powered penta motor?
 
I don't think you can lay SU's on their side and expect them to work properly, even if you can tilt the float bowls on an HS6. The oil will pour out of the dampers.

That's a very good point. Possibly an angled flange would work, but you'd need a Buchka to make it for you. I doubt the machine shops near us would try it without lots of hand-holding and money.
Me: I need two angled flanges to mount these 1960's automobile carbs to this boat intake manifold. I have the design drawn with measurements. I just need someone to mill them for me.

Machinist::wtf: Uhhh, is this for a Chevy? I can do Chevy. Whut's it for again?:wtf: A Volvo?:wtf: Uhhhh, I gotta check with the boss about this. Cletus! This guy wants a flange for a Volvo!

Cletus::wtf:Whut the hell fer? It ain't a Chevy!

Me::roll:
 
The Solex is a downdraft, those manifold may or may not have a similar bolt pattern, the main issue is that the carb mounting face is pointing straight up, not over to the side.

Either have the intake chunk sawed free from the exhaust chunk, or look around for more than 10 seconds for a B18 manifold.
 
That's a very good point. Possibly an angled flange would work, but you'd need a Buchka to make it for you. I doubt the machine shops near us would try it without lots of hand-holding and money.
Me: I need two angled flanges to mount these 1960's automobile carbs to this boat intake manifold. I have the design drawn with measurements. I just need someone to mill them for me.

Machinist::wtf: Uhhh, is this for a Chevy? I can do Chevy. Whut's it for again?:wtf: A Volvo?:wtf: Uhhhh, I gotta check with the boss about this. Cletus! This guy wants a flange for a Volvo!

Cletus::wtf:Whut the hell fer? It ain't a Chevy!

Me::roll:

:rofl:

A little off topic but while I was at the driveshaft shop I asked them about rebuilding my M41 shaft so he checked his shelf for U-joints and they actually had 6 of them. The guy yelled to some other guy in the shop : "Hey we have u-joints for uhhh...what was it?"

Me: "'67"

Guy: "'67 Volvo!"

Anyway, I'll just take the manifolds down to the metal works and let them grind it off for me. It'd be pointless to spend the extra money for another manifold.
 
I see what you mean about the throttle linkage. I guess waiting for a cheap B18 intake to turn up is your only option. An adapter flange is out of the question because it'd be more expensive than waiting for the right parts to turn up.
 
Smokey tossed a bunch of those B18 intakes.

Typically they go for $75-ish in good shape, and if you're lucky you'll get one in the JY with the linkage.

Here's a freshening up picture.

Lapping the surfaces on #600 and chasing the threads.

82245GLTPaint184.jpg
 
Yeah, John linked that one. I just think I could get mine split for cheaper than $100+shipping. I'll have to take it down there and ask them about it. Plus I PM'd Mike to see if he still has any of those by chance. Thanks for the help though, fellas.
 
Back
Top