Re: Post Your Straight Six Pics!
Quote:
Originally Posted by Conroe trucker
Here's mine.
I have a rebuilt engine and am having hell getting the exhaust manifold to seal after the first cylinder at the bottom.
I am also curious if the exhaust preheat valve could be sticking and causing additional back preasure.
It is not sticking, but what if I wired it open?
The first picture is at rest with the manifold warm, the second the spring is under slight preasure to hold in that postion.
I have a really quiet muffler on it, so I expect I have some back preasure anyway.
I put the second gasket on and it did not seal at all, looking for ideas.
I thought I read that you must put the intake and exhaust on together but not bolted up, tighten everything, then tighten the preheat cavity.
Also looking for a tuning schematic for the 1BBL carbs if you might know where to find one.
Mike
CUSTOMAL@FLASH.NET
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The pre-heat valve can be wired open ok. We wired open the one on my son's 250 in his '71 Chevelle and it runs great.
I have not checked the one on the 250 in my '67 yet so I don't know if the previous owner wired it open or not.
Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465.
'75 C-30 Single Cab DRW-350 small block/NP-435.
'77 GMC-6500 Dump Truck, 427 Tall Deck.
'92 GMC K-3500 Duallie, 454/4L80E.
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