Originally Posted By: gman2304
Originally Posted By: DoubleWasp
Have you ever tried the exhaust manifold gaskets that have the heat shield tabs that rise up past the exhaust port level? Lot of us have had good results with those keeping the heat off of the valve cover.
The "HP" manifolds are a magnificent design that will support over 500hp.
x2! Those manifolds performed as well, probably better than any after market header. The manifolds alone are worth a lot of money and are scarce as hens teeth.
Back when I subscribed to High Performance Mopar in the mid/late 1990s, one of the writers (Dave Foley???) had a 67 GTX that he tested all sorts of goodies on. For years it had a bone-stock look, including the HiPo manifolds like mine. At one point he had them extrude-honed and that picked up a few horsepower. I think he was in the high 11s at that point. He finally gave in and put on a set of TTI headers for an article and it did go faster, but not by a wide margin. I love the look of them, the only thing cooler were the 426 MaxWedge manifolds.
Originally Posted By: DoubleWasp
Have you ever tried the exhaust manifold gaskets that have the heat shield tabs that rise up past the exhaust port level? Lot of us have had good results with those keeping the heat off of the valve cover.
The "HP" manifolds are a magnificent design that will support over 500hp.
x2! Those manifolds performed as well, probably better than any after market header. The manifolds alone are worth a lot of money and are scarce as hens teeth.
Back when I subscribed to High Performance Mopar in the mid/late 1990s, one of the writers (Dave Foley???) had a 67 GTX that he tested all sorts of goodies on. For years it had a bone-stock look, including the HiPo manifolds like mine. At one point he had them extrude-honed and that picked up a few horsepower. I think he was in the high 11s at that point. He finally gave in and put on a set of TTI headers for an article and it did go faster, but not by a wide margin. I love the look of them, the only thing cooler were the 426 MaxWedge manifolds.
