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By 62bigwindow - 7 Years Ago
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What's the best way to block off the exhaust crossover? I've thought about welding up the ports on my intake (aluminum ) or making a small plate and silicone them to the gasket. Any suggestions?
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By MoonShadow - 7 Years Ago
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Small tin plate works well. Some of the intake gaskets have a plate with a small hole to restrict the crossover.
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By oldcarmark - 7 Years Ago
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I used a couple of pieces of Tin or Aluminum trimmed to cover the Ports and put the Gasket on top. Thin enough that they won't affect Gasket Seal. Been in there for 5-6 Years. Dont forget to remove the Heat Riser Valve and replace it with a Blank Plate to make up for missing Valve. Available from most of the usual Ford Suppliers.
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By tarheel - 7 Years Ago
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I like the intake manifold gaskets with the restricted heat tube crossover passageways. I have been running them for a couple of years now with no problems. I bought mine from Tee Bird. They say the gaskets let enough heat through to provide enough carb heat but not enough to burn the paint off the manifold. My engine seems to take a little longer to get the carb up to heat but I'll trade that for having paint on the manifold.
Larry
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By 62bigwindow - 7 Years Ago
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Thanks. About how thick of tin did you guys use? I was thinking maybe .005-.007 thick. I already have the restrictor gaskets and it still heats up the carb too much. I'm running a Blue Thunder intake so there is no heat riser valve to deal with. I also got a 1" phenolic spacer to help so hopefully between the two I should be good.
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By Talkwrench - 7 Years Ago
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Just use the gaskets that have the restricted hole, You might be best to have some sort of heating unless you are an a warm climate most of the time .
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By 62bigwindow - 7 Years Ago
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I already have the restrictor gaskets in place now. The problem I'm having is the carb is heating up after I shut the car off. If it sits less than 30 minutes it doesn't want to start well and after it starts it doesn't idle well until it gets driven a short distance.
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By Talkwrench - 7 Years Ago
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That might have more to do with that shit fuel you guys have.? Sounds more like you need the heat if its not idling well until it heats up.
What state are you in ?
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By miker - 7 Years Ago
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That's a pretty common problem in my experience. Both my cars do that parked with the hood down. Then I noticed at a show where the hood was open, it didn't happen. I haven't found a cure, I'm inclined to blame it on the ethanol and Reid (?) vapor pressure of modern fuel designed for use in fairly high pressure EFI systems. I know it wasn't a problem way back when. Vapor lock when driving seems more common too in our old cars.
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By charliemccraney - 7 Years Ago
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I use the restricted gaskets here in Atlanta. That's up to around 100 degrees in the summer, so for most people they should do the job.
Do you have a spacer? If not, try a spacer. Phenolic spacers are available as thin as 1/4". Edelbrock make a gasket that is 3/8" thick.
Also make sure it is not some tuning or ignition issue.
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By 62bigwindow - 7 Years Ago
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I live in Northeast Missouri. Summers get pretty warm here also. I think the biggest problem is what Miker experienced also. I was hoping blocking off the crossover and a phenolic spacer would help to alleviate the problem. As far as fuel I only burn 91 octane non-ethanol.
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By Ted - 7 Years Ago
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I use a couple of solid tin plates on top of the intake gasket crossover port. These I put a small 90° lip at their tops so they stay in place while laying the intake in place. If using the Best Gasket intake gaskets, then I remove the existing ‘restricted’ tin plates that are on the gaskets and use my fully blocked ones.
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By 62bigwindow - 7 Years Ago
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Thanks Ted. About how thick are the plates you use?
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By PF Arcand - 7 Years Ago
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With the restricted truck style gaskets & a phenolic spacer it should be o.k. As suggested, there may be something else going on there. A possiblity is that the carb is leaking into the manifold after shutdown. I had that problem with a Holley 2300-2 Bbl. Ted put me on to checking the orfices behind the float bowl for being plugged up. They were. Carefully cleaned them (no reaming) & no problem since. Likely caused by old fuel & sitting for long periods.. And is your heat riser opening properly, if you have one?
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By Ted - 7 Years Ago
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62bigwindow (6/13/2017)
Thanks Ted. About how thick are the plates you use?
The material I use for making the exhaust crossover block offs is 0.010” thick. That’s exactly the same thickness as the restricted tin plates that come on the Best Gasket intake gaskets. Blocking off the heat riser passage is customary on those engines where you are wanting to keep the paint from burning at the intake manifold crossover. The block offs only affect cold weather startups/driving and once the engine is warmed up, there are no other adverse effects.
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By Lord Gaga - 7 Years Ago
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I was recently reading an automotive text book published in 1946. It states that a intake manifold "hot spot" is desired for fuel vaporization....is that no longer true?
Ted (6/14/2017)
62bigwindow (6/13/2017)
Thanks Ted. About how thick are the plates you use?The material I use for making the exhaust crossover block offs is 0.010” thick. That’s exactly the same thickness as the restricted tin plates that come on the Best Gasket intake gaskets. Blocking off the heat riser passage is customary on those engines where you are wanting to keep the paint from burning at the intake manifold crossover. The block offs only affect cold weather startups/driving and once the engine is warmed up, there are no other adverse effects.
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By 57RancheroJim - 7 Years Ago
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Back before todays crap fuels you wanted the fuel to vaporize so you didn't have raw fuel going into the cylinders, that caused cylinder washing that removed oil from the cylinder walls if I remember. Fuels were also blended with stuff to prevent boiling.
Todays engines with fuel injection and computer controlled don't require that type of fuel, it seams the crap now boils and vaporizes on a good warm day :-). Just my theory and I have nothing to back it up..
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