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I do not think this is a carb problem. It is certainly strange & interesting...

On a DP intake, each plane [ & therefore one side of the carb ] feeds two cyl on the left bank, two on the right bank. Same with the other plane. The fact that shorting out the plugs on the left side almost stalls the engine, but the other side doesn't makes me think the problem is left side [ odd, 1,3,5, 7 ] related.
First thing that comes to mind is int gasket leaking on left side.
 
Bewy said:
I do not think this is a carb problem. It is certainly strange & interesting...

On a DP intake, each plane [ & therefore one side of the carb ] feeds two cyl on the left bank, two on the right bank. Same with the other plane. The fact that shorting out the plugs on the left side almost stalls the engine, but the other side doesn't makes me think the problem is left side [ odd, 1,3,5, 7 ] related.
First thing that comes to mind is int gasket leaking on left side.
Click to expand...
Wondering if the heads were shaved and now the mating surfaces are not aligned properly. What type of intake gasket was used? Reused the valley pan? Sealant used?
 
Ricks70Duster340 said:
Wondering if the heads were shaved and now the mating surfaces are not aligned properly. What type of intake gasket was used? Reused the valley pan? Sealant used?
Click to expand...
what I suspect......this is what happened when I first got engine back......it was running very lean and poorly.....the exhaust as it left the tailpipe was so hot, one time when I had a exhaust hose hooked up the hose was close to garage vinyl siding and melted it....
I took off manifold, got a new valley pan and used RTV and that helped a lot..... I cant get any other gaskets other than the valley pan to fit,,,manifold won't line up..... The block was never touched, stock bore and crank before I rebuilt it, the block was decked but only this once.....The heads are unknown as to how many times they were resurfaced.......Hopefully I can get a compression check done today and after that im going to remove the carb, blank off the manifold base.....remove the rocker arm assemblies and but in 5 psi air pressure and listen for leaks underside the intake.......
Im running out of options but im determined
 
Steve welder said:
what I suspect......this is what happened when I first got engine back......it was running very lean and poorly.....the exhaust as it left the tailpipe was so hot, one time when I had a exhaust hose hooked up the hose was close to garage vinyl siding and melted it....
I took off manifold, got a new valley pan and used RTV and that helped a lot..... I cant get any other gaskets other than the valley pan to fit,,,manifold won't line up..... The block was never touched, stock bore and crank before I rebuilt it, the block was decked but only this once.....The heads are unknown as to how many times they were resurfaced.......Hopefully I can get a compression check done today and after that im going to remove the carb, blank off the manifold base.....remove the rocker arm assemblies and but in 5 psi air pressure and listen for leaks underside the intake.......
Im running out of options but im determined
Click to expand...
Ideally the intake should be machined to match the machining of the head surface so they will match. The intake bolts would then align properly and gasket sealing would be much happier.
 
Ricks70Duster340 said:
Ideally the intake should be machined to match the machining of the head surface so they will match. The intake bolts would then align properly and gasket sealing would be much happier.
Click to expand...
Im thinking Prussian blue no gasket and see how the intake lines up with heads
Im thinking of Sidewinder heads, talked to Todd? and I liked the guy, he will build heads according to my engine and no taking them to a shop to be gone over......Only problem is he doesn't have heads yet in stock, maybe by years end.....
 
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