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Mummert Intake Question

Posted By Florida_Phil Last Month
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2721955meteor
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have a 600cfm holley4v  on a292.040 over bore,56merc reground cam,works great,lots of power,dual exhaust,with heat riser on drivers side,works great on cold starts, purchased the carb from holleys used website(warranty carbs repaired and resold) at very good price. have used this setup for 4years. myn is in a 1949 mercury  f47
slumlord444
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My experience with the Blue Thunder intake has been great. I replaced my port matched E intake and carbs with the Blue Thunder and a 750 Holley. Engine has Mummert heads and a custom grind Isky cam with Sharp roller rockers. Night and day difference. Better torque in the 5000 rpm range.
PF Arcand
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Phil: Black Tie brings up a point.. will an aluminum intake on your engine hurt low end power?.. In the recent cylinder head tests printed in Y-Blk magazine, c/w a Mummert aluminum intake, the "score" for the engine with stock. "G" heads, up to 3500 rpm, was identical to the engine with aluminum heads!  If you're not planning to run over 5000 rpm...is it worthwhile ??     


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Florida_Phil
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I'm going on vacation next week.  When I return, I am going to rebuild my "S" code Holley and put it on my iron manifold.  I'll post my results.  Next, I think I'll work on the exhaust. I hate to scrap the 57 Thunderbird manifolds, but the stock pipes are pretty restrictive. My exhaust system is from NPD.  The tubes are small and made up of numerous pieces held together with clamps. It's noisy too and not in a good way.  As 55 TBirds go, my car performs well.  It could be better,


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55blacktie
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The stock down pipe, between manifold and muffler, is 2". from the muffler to the exit, the pipe narrows to 1.75." You could keep your manifolds and go with 2" mufflers and pipes, or go with 2 1/4" from down pipe to exit, while still retaining manifolds. If desired, you could later install headers, with only the down pipe between header and muffler needing to be replaced. 
DANIEL TINDER
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There used to be an outfit that flow-ported and coated iron manifolds to make them more efficient.  Probably much more expensive than headers, but I always wondered what happened to that company, and if anyone has had dealings with them lately (?).  Sure would be simpler, especially for those wanting to retain a more original appearance.
BTW: My Bird had 2” exhaust installed when I obtained it, but everything was rusted out. Buying aluminized OEM replacement parts (except for the glasspacks) was just more expedient on a car with an unmodified engine, and the open exhaust likely more than made up for the smaller pipe sizes.

6 VOLTS/POS. GRD. NW INDIANA
Florida_Phil
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I tried the 600 cfm 390 GT Holley carburetor on my TBird.  Ran into a small amount of clearance trouble with the coil and I had to make a new fuel line. Other than that, no issues.  To be honest, I think it runs better with the Holley 465 cfm.  The bigger carb seems a little stronger in the upper RPM  range, It drives better with the 465 around town.   It's hard to beat the torque and drivability of the 465 on the street.  I guess that's why Ford used it on the 57 312s?


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