I plan on using an electric choke. I don't do much cold weather driving.  Does the heated cross over cause excessive heat at the head if it is blocked off?  I am using ECZ-C heads.  Would really like to find an aluminum timing cover, but i know its a long shot.  Thanks 

Located in Harford County Maryland 

It will not cause excess heat to be present if blocked off.


Lawrenceville, GA

Panel Driver:  J.Mummert (machine)  sells the aluminum timing covers, but is apparently out of stock currently.  Getting the castings done takes time as the foundry is very busy & most of the other foundries have folded shop & the work in now done "off shore."  Try Mummert in S. Calif in a few months, @ (619) 596 - 0312  in El Cajon. 


Paul

Have spoke to J Mummert. He told me it may be awhile before he gets them. Thanks for the suggestion. 

Located in Harford County Maryland 

i have a ecz-b intake  i bought 3 years ago at monrow never used it.want 250us and could ship it out of blain (frt from blain to??. cliff  ct1940 @shaw.ca  or 778 5741940

Thanks for the option. I will try to wait and get one from Mummerts.  Thanks Joe 

Located in Harford County Maryland 

Going back on the postings here. Why on a truck would you block off the crossover on the Blue Thunder or "B"manifolds?  Assuming the exhaust system doesn't have a Heat Riser, it's very unlikely that there will be excessive heat, particularly in the area where U live.. Some degree of heat helps vaporize fuel which helps warm ups & avoids card icing.. it's not a race car..     


Paul

I get requests all the time for blocking the intake manifold heated crossovers in the Y-Block intake manifolds.  One of the reasons is simply due to the paint burning at those crossovers on the painted manifolds.  Another reason is to eliminate the potential for carburetor flooding in hot ambient temperatures (Texas and other southern states) that occurs when the engine is shut off due to the manifold being overly hot.  Both reasons are valid but must be weighed against where and when the vehicles are being driven.
 
Both carburetor icing and that transition between where the choke has opened and the engine is still not fully up to temperature are two of the reasons why the intake manifold crossover passage is left open for heat.  When the intake passage is left open, it works best and as designed with the heat riser valve at one of the exhaust manifolds.  Unfortunately those exhaust heat riser valves only have a ten year life expectancy which is why so many older vehicles opt for running without them once the valves start to give trouble.

Lorena, Texas (South of Waco)

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.