| Looking for Opinions on Aluminum Heads [message #321258] |
Sat, 29 July 2017 18:17  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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As discussed in a previous thread, I have a J head on the left side of my 455 and a K head on the right. The K head evidently has a couple of burned exhaust valves Which came to light during a leak down test. The left J head is in much better shape.
I know the J head is the preferred head for our application, and Bob Dunahugh has offered to get one to me to replace the K head, but I have always been intrigued by the aluminum heads that are available for the Olds engines. I have actually seen a few coaches with them on their engines, and it makes sense to have the more efficient combustion chamber shape, the better heat dissipation, and the weight savings of the aluminum heads.
I contacted Jim Bounds, and his opinion is that we need the low compression smog heads (J) for our engines to develop the low end power we need the most. I just wanted to get more opinions on this so I can make an informed decision on this before starting on the project.
What do you guys think of aluminum heads, pro or con, and why?
Thanks
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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