[Chrysler300] 440 exhaust manifolds

["brian762" <brian762@xxxxxxxxxxxx>]

Hi Folks - Speaking of exhaust manifolds, I have some questions too. I have a 1970 300, (not a Hurst), with A/C. All stock outside, down to the hubcaps. She's a 4 door. I didn't know the TNT exhaust manifolds were different than normal stock 440s until I read it here in a post last month. How much different / better are they? She had developed a bent valve, and, well, one thing led to another... I  added a Mopar TNT cam, and matching valve job by Napa, dual exhaust with fairly short mufflers, Mopar electronic ignition w/ the orange box, +  Sure-Grip. Mopar aluminum intake manifold and fresh Edelbrock carb works like a charm, even the cruise, I was on a Holley and Carter carb nightmare merry-go-round there for a while, enough was enough already.  Power band has moved up as hoped, and no more wheelspin.  Gas mileage has suffered only slightly around town, about the same on highway, but much better performance. Would TNT manifolds add that much? How much horsepower might I be losing? It's really not lacking speed or power now. Does anyone have a set for sale? Are they the same dimensions (would it be a simple swap)? Should I leave well enough alone? I know that's a lot of questions, I look forward to your replies, Thank You,
Brian J. Belknap 

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