bb cylinder heads :how to choose?
09-21-2002 | 10:06 PM
#12
Guest
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Siamesed blocks
I don't think there is much wrong with using siamesed blocks for horsepower production. But I think that when it comes to reliability in a regular production engine it would HAVE to be better to have a coolant jacket surrounding the cylinder. It would certainly make the water flow through the engine easier and without as many steam pockets.
I have never had any problems with 502 engines but Chevrolet did redesign the head gaskets for an improvement in cooling (now there is a left and right).
Engines would be a lot more compact with siamese cylinders and I would think that they would be more common if there were no drawbacks.
Chevrolet went to a lot of trouble to design the new 496 without using a siamese block. There must be some good reason why!
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
I have never had any problems with 502 engines but Chevrolet did redesign the head gaskets for an improvement in cooling (now there is a left and right).
Engines would be a lot more compact with siamese cylinders and I would think that they would be more common if there were no drawbacks.
Chevrolet went to a lot of trouble to design the new 496 without using a siamese block. There must be some good reason why!
Dennis Moore
FAMILY AND PERFORMANCE BOATING MAGAZINE
Last edited by Dennis Moore; 09-21-2002 at 10:08 PM.
