454/420Hp build up
#11
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The big mercruiser manifolds with the 6 bolt riser? They no longer exist. The wet joint was too big and leaked. This manifold is the reason merc started using gils. They support a lot of power, but will wreck your engine. They make good wall hangings. You need 2 modern sets of exhausts. And please, don't resurrect old threads. Start a new one.
#12
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MT you going to stay dual plane? Something tells me you likely will. Those stock intakes work well and one of the most even EGTs dual planes I've tried. This goes bac ka few years but I don't see any drastic changes since either. Something to be said about the original look also. Just my opinion. When you acquire the Excalibur anyway?
#13
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#14
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nothing like bringing back a 12 yo thread,lol.
#16
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Thread Starter
By the way. The 425hp I was speaking of, was neither a GEN 6, nor a GEN V. It was a Mark IV mercruiser high performance crate long block. Basically the same engine as the 454 /420hp Merc.
#17
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#18
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Thread Starter
#19
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Simple. A guy looking for a set of those extinct manifolds found this thread by Google searching 420 exhaust. So he joined OSO and resurrected a 12 year old thread not realizing it was 12 tears old to try to find a set. I bought a set at a boat swap meet in 1993. 30 bucks. Already extinct. Went to Trenton marine to buy tails. They said 750. I said nobody wants them. 100. They said 750. I said throw them out and threw the manifolds out.
#20
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Simple. A guy looking for a set of those extinct manifolds found this thread by Google searching 420 exhaust. So he joined OSO and resurrected a 12 year old thread not realizing it was 12 tears old to try to find a set. I bought a set at a boat swap meet in 1993. 30 bucks. Already extinct. Went to Trenton marine to buy tails. They said 750. I said nobody wants them. 100. They said 750. I said throw them out and threw the manifolds out.