The Stovebolt Site Forums The Shop Area The HiPo Shop fenton offy combo

ok, from the experts...
I have a 235
I would like to do the fenton header
offenhauser intake combination
I have 1 carter 1 barrel and would like to find another..
now... What is the deal with the heat riser plate?
I hear you need one, I hear you don't...
can someone give me a straight answer?

I say you do, if you live in a cold weather climate. I installed one on my 261 and plumbed it to the exhaust. It heats things up quickly and you do not have to worry about water leaks.

i have the combo and i bought my extra carb from auto zone, about 105.00 a year ago. got my heat riser plate from langdons in michigan. i plumbed it with copper pipe to the exhaust manifold. pictures on my webshots. ron

Just a suggestion......check with Tom Langdon (Langdon's Stovebolt) for his adaptor, linkage, Carter/Weber, and heat plate....also you may need an electric choke kit. Finding a matching Carter from AutoZone or for that matter any supplier may wind up being a shot in the dark.

I tried to find a rebuilt Rochester...Az's rebuilt was improperly reassembled and the choke circuit wouldn't work....went with Langdon's single Holley/Weber, adaptor, linkage, choke adaptor. It worked great right out of the box...made my own heat riser using manifold heat. For a dual carb setup Langdon can fix you up with a pair of matched carbs and hardware that will eliminate a lot of headaches.

51Greenmachine,

Do you have any pic's on how you plumbed it to the exhaust?

what about strombergs? will they work on our 235? I tend to go to swap meets and find stuff layin around..

I went with Tom Langdon's 2 barrel Holley/Webber carb, which is what Pinto's came with. It's really an excellent carburetor that works a LOT better than the old OEM 1 bbl's.

Some people use two of those on the twin carb manifolds. Then you get 4 barrels. I didn't because at my high altitude, I'm afraid 4 barrels on a 3800 rpm 235 might be over-carburetion. Also, you can't get the jets new anymore. But being brass, you can solder them and re-drill the holes with what you need easily enough.

And I don't know that the modern carbs require as much pre-heating from the exhaust as the old carbs did. My Holley/Webber is isolated with a half-inch carb spacer, and except for about a minute of warm up time on cold mornings, it doesn't seem to miss it.

I'd say pretty fearlessly that if you have a modern carb, you probably don't need to worry about the heat riser. But if you run the older carbs, you'd better have them.

One more quick comment on the Holley/Webbers. Even though they're two barrel carbs, they have a primary and a secondary. So off of idle, you only have one barrel, which helps with improving torque, and then at speed, you get the other barrel, which helps with power and rpm. I have experienced that the Holley/Webber is an improvement over the Rochester 1 bbl over the entire rpm range. It is a worthwhile, and very inexpensive upgrade.

If you do get it, you'll also need his adapter, and his linkage kit. So buy the whole shebang. It's inexpensive, as I've said.
He also carries the Carter/Webber, but it's a slightly smaller carb. Maybe a better choice if you want to run twin carbs on a 235.

I'd leave the strombergs to the flathead guys. They can be made to work, either with an adapter to the GM carb pattern, or with the Howard 5(!!!!) carb manifold. But be warned, Strombergs are notorious for leaking. They're also some what small. It seems that the Holley/Webber or Carter/Webber is the popular setup, I'm running 2 single bbl Holley 1904s myself.
I looked at the schematic for the Holley/Webber that was posted a few days ago, it looks alot like the Rochester 2SE. Has anyone considered using thet instead of the Holley/Carter/Webber? They are fairly common to find, and have a similar progressive 2 bbl operation. Just putting out an idea.

I have seen a vintage offy 3 carb intake that might be worth looking into as well..
I am hooked on the vintage performance parts thing...
of course then I saw this..
http://cgi.ebay.com/ebaymotors/235-...itemZ300029932712QQrdZ1QQsspagenameZWDVW
a blower in my bolt would be sick

Why can't Patrick's/Langdon's make something like that? I wouldn't mind putting a blower on mine, either.

How would the old 6 handle a blower? Would you have to do any mods? How about the pulley?

I dunno, old skool rodz had a feature on a 50 buick with a straight 8 and a blower...
it was sick...blower off to the drivers side and all
the 235 is pretty bullet proof...
I am not sure if you'd have to drop the compression, I guess it depends how many pounds the blower was pushing..
I would personally rather have a blower and a 235 than a small block 350... no offense to anyone here with that... I just think it would be cool to be different.

I'm with ya, Mike!!!

Joe

I like the idea and I did some looking and didn't think putting a blower on was an option.

I would really really like to throw the blower on my 261!

chev235

Check out my webshots page, goto the 261 rebuild section, there are pics of the plumbing....

51Greenmachine ... I couldn't get the link to webshots to work. Is it up?

Chev;
51's site should be .webshots.com not con. Drop it into your browser and correct the n. I also have some shots of my plumbing on my dual Holley/Weber set-up although it's not finalized yet.

http://community.webshots.com/user/geezer

SWEET has some pretty sweet plumbing on his 261.

49 geezer ... you have to be proud that is a nice setup.

I looks like you used a fuel pressure regulator into a fuel line manifold. Is this necessary. I am running 2 Carter/Webbers and I was told not to worry about the fuel pressure from the mechanical pump.

What did you use to seal the bottom plate on the intake manifold. Did you make your own gasket?

What did you use for an oil filter bracket? I really like this look?

I like the idea of using piping the exhaust in the intake but how does that work for pressure once enough pressure builds does hot air keep circulating in the intake?

Hey 49 geezer,i sent you a private message !!

Here are some pictures of my engine. I have done more since these were taken.

http://picasaweb.google.com/akuips/EnginePictures