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Deuling's 1985 K5. "Restart thread on post #8415"

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I wanted my truck to be the best off all worlds. We will see how it turns out in the next few months.:thumb:
 
Deuling said:
I think the time last summer during the dune party when i took off at the dunes with a bunch of rigs next to me, and then when i stopped and dave caught up to me shortly after and he said man you were going fast, and then we looked back and it was a couple min wait for the rest of the group to catch up.... That was the moment I realized I had done something right :D

(ps wade wasnt in that group lol)
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Your truck does work pretty well Adam. I didn't get to wheel with you guys as much as I planned to because many times when you guys went out my wife was in the truck feeding Anna. I think I only ever made one lap with you guys, and you weren't even there yet that day. At that point it was just Dave, Wade, and Swetty riding with Wade.
 
What are these ports for? Cant be water, they are black on the intake and on heads, and not rusty like the water ports at the ends.

And why do both different sets of gaskets I ordered have no holes for them?? :dunno:








Old ones had them

 
The center ports are exhaust heat crossover passages,that warm up the base of the carb or throttle body to help fuel vaporize better in cold weather and after a cold start--the exhaust manifold on the passenger side on most vehicles had a heat riser or EFE valve,that closed and blocked the flow of exhaust out the pipe and forced it to go back thru the passage in the intake and out the drivers side exhaust pipe....the black stuff is carbon you see..

Some engines had them blocked by the gaskets,or gasket sets had the block off things included,if the heat wasn't desired..trucks used under heavy duty use and vehicles in warm to hot climates usually had them blocked off to prevent vapor lock or boiling the fuel..
Edit--yeah,on later than '73 engines they did get the exhaust for the EGR valve from this passage too...
 
Well i dont need EGR. I dont think any of these rigs in michigan have had an EGR in decades lol. And this thing is a summer toy, so am i all good to just keep it blocked? Seems like it will only help keep the carb cooler.
 
Older Fel-Pro gaskets would come with a stainless blocking plate to put in there.

You could even go as far as filling in your intake a couple if mine don't even have the cross over there.
 
Good deal. Wish id have noticed that before. I wouldnt have ran home to ask. But I didnt want to install intake only to remove because i needed that open....

Oh well i gotta work in the am anyways. I did get all the rockers on and adjusted. I went with a 1/4 turn.
 
The weights in the kit are smaller than the stock ones. Do I need to swap them in? Or just swap to lighter springs?

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It is going to be a bit of check and try any way. You want it all in by 2500.
 
Deuling said:
Cool. The intake has a small crack at the bottom center of one of them anyways. I think thats why the bottom center of the intake has some black on it.
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If it has a crack in the exhaust passage,time to scrap it--that can let exhaust into the valley and pressurize the crankcase and cause blowby and seal leakage woes...(blocking the ports off might work OK,but might still let some exhaust sneak by them)..

I had one small block that always had a hesitation when you accelerated and replacing accelerator pumps,switching to a different carb,and a new fuel pump & complete tune up failed to eliminate..

One day a friend decided to clean his garage out and he gave me a aluminum intake ,a Holley one...I decided to swap a 4 bbl on my engine ,I had used an adapter to put a Carter AFB on the 2 bbl intake and didn't really like it much,so I decided to swap the aluminum intake on it and rig it up right..

When I pulled the old cast iron stock 2 bbl intake off,I saw a big crack in the center and a ton of soot around it,along with a pile of carbonized oil in the valley covering the lifters--looked like coal dust!..I cleaned all that up with a shop vac and put the "new" intake on--this one had no exhaust passages at all..

What a difference when I got it done!..the idle speed went up to about 1500 rpm by itself,I had to crank out the idle speed screw and lean out the idle mixture screws..the "bog" on takeoffs was finally GONE,and I noticed the engine idled much better and it didn't put out that "fog" out of the valve cover breather and stink up the cab with oil fumes..evidently that intake was cracked for a long time..(it had some rust in the crack!)..

I did notice the carb liked to ice up in cool damp weather with no heat riser passages,but it was only an issue on certain days when the weather was "just right",and once it was run 15+ minutes it wasn't a problem..

I suspect the 2 bbl intake on the 307 in my van has a cracked intake too--it has the same "bog" when you accelerate and it also has some blow by,and the compression tests good...
 
I have a low speed miss in my lpg 454 I can't find. Going to replace the dist with a new Chinese unit. I plan in taking off the weights and putting the springs back on. It is the fast and easy lock out. The engine is 7.8 to one on 100 octane fuel. I will set the vac can for 50-52 total under full vac advance + initial.
 
The stock springs are softer than the medium springs in the kit. So maybe one light and one of the stock?
 
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