Did mercruiser make a dry joint exhaust manifold for 454-502 BBC?
#1
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Did mercruiser make a dry joint exhaust manifold for 454-502 BBC?
I'm having problems with my exhaust and want to replace the old logs with a dry joint manifold. Did mercruiser make a dry joint for the 454-502. I think the 496's were dry joint. How the the 496 manifolds fit on the older BBC in relation to valve cover clearance?
#3
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I have 496 manifolds and risers on a 454. Works fine, even with tall valve covers. You'll need new bolts (longer) and the riser exit angle / height is different. The angle & height were made up in the exhaust hose on mine (approx 14 inches of hose). If you have a close coupled riser exit it might be a problem, but can be overcome.
#4
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Ive heard the Gils had problems? I'm not too particular if they are Gil,s or stock but as long as they are a dry joint. I think Im getting water coming in between the riser and manifold because of the weight from the tail pipe that puts pressure on the riser joint.[ATTACH=CONFIG]542144[/ATTACH][ATTACH=CONFIG]542145[/ATTACH]
#6
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thanks BL. Im not concerned about the flow capabilities of the Gil,s vs center risers. either is going to be better than my logs and I 'll just crank up the boost. For me price is the big concern. If I can get a set of 496 manifolds for 1/2 of what Gil's cost. Ill get the 496 manifolds.
#7
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thanks BL. Im not concerned about the flow capabilities of the Gil,s vs center risers. either is going to be better than my logs and I 'll just crank up the boost. For me price is the big concern. If I can get a set of 496 manifolds for 1/2 of what Gil's cost. Ill get the 496 manifolds.
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#10
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That is in the works. Im going to get a EFI single plane manifold from EBAY so I can still use my intercooler. Use LS1 throttle bodies on each turbo, and controlled by a Mega Squirt system.