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have a bseries 4v 250 us, shipping would be from blain wa. cliff ct1940@shaw.ca2shaw.ca
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Thanks for the reply. I recently purchased an intake from mummert. I am still looking for an aluminum timing cover and a points style ignition distributor with
vacuum and centrifical advance though. Thanks again Joe
Located in Harford County Maryland
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Tedster (11/29/2019)
Ted: Can you help and try to explain if/how or maybe the lack of a heat riser impacts the crossover system? For example, say a set of Rams Horn exhaust manifolds. I've never have had a real warm and fuzzy on exactly how it all worked in the OEM setup with the crossover exhaust. In other words for simplicity's sake there were two (2) possible conditions, flapper open or closed in the original setup, now does the installation of dual exhaust manifolds without any heat riser result in some kind of weird condition that is neither good for hot weather nor good for cold? There's no actual diversion of exhaust through the intake, or does it alternate through exhaust pulses, i.e. is it an identical situation to "flapper open" in the old system? It does seem a little cold blooded. Not bad, though need to run with the choke full out for maybe 5 or 10 minutes in cold weather. So why not block the manifold ports off completely? This would seem to be better for summer ops. Doing away with the heat riser valve and having a dual exhaust system simply slows down the natural heating of the intake manifold. In fact, if the exhaust system is unrestrictive (very little back pressure) then exhaust flow through the manifold will be very little and ineffective as far as actually preheating and adding heat to the intake plenum. Without the heat riser valve, the intake manifold just warms up much slower and heats up only as a result of conduction from the cylinder heads. If there is no exhaust flow through the manifold either as a result of blocked heat crossover passages or a very non-restrictive exhaust system, then carburetor icing when the temperature drops below the dew point becomes a real probability. In the normal scheme of things, preheating the manifold via the heated crossover is only required until the intake manifold becomes the same temperature as the rest of the engine. After that point, it’s no longer needed and in some instances becomes a detriment.
  Lorena, Texas (South of Waco)
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Noted the comment about driving a cold engine with the choke full on for up to 10 minutes... in a word, not a good idea!..
P.S.- re read your posts & noted that U recently bought a Mummert aluminum intake.. Getting heat to the carb area or not is irrelavent, because unlike a "B" or Blue Thunder intake, the Mummert does not have a crossover...
Paul
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you can try rexhp.com they show intakes & timing covers on there site last time I looked
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Group: Forum Members
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you can try rexhp.com there site did have both items on them
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