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DRR Sportsman |
Have a bbc that is closed chamber and looking to buy a set of aluminum heads my guess putting open chamber on a closed chamber motor will drop the compression . pleas school me on this..... | ||
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DRR Top Comp![]() |
You probably know this but your piston selection has to be compatible with your heads. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR Pro![]() |
How many cubes, and what are you hoping to get from it? I'll assume it's a 427, and having not researched the combo lately, I'm thinking closed chamber aluminum heads are fairly scarce? "Despite the high cost of living, it remains popular." Dave Cook N375 | |||
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DRR Sportsman![]() |
Do you know what piston you've got in there now? (Any markings on the top)? What bore size or CID is it, and also what head are you currently running on it? As Bruce & Dave pointed out: 1. Piston configuration is critical, because many open chamber heads will contact some of the common closed chamber pistons. And 2. There are not many (maybe none?) closed chamber aluminum heads currently being manufactured. You may be able to find some vintage or NOS GM Closed Chamber aluminum heads. I don't recall details or P/N's, but I believe the Open Chamber aluminum heads Chevy put on the 71 LS6 used the same domed pistons as the 70, which was Closed Chamber. So whatever head casting the 71 used, may work on a closed chamber 454 type combo, if the piston being used is the same or similar to the old Speed Pro (TRW) slug, (thinking it was the LF2307A, 12.5:1 CR on the 70, 11.25:1 on the 71).. Dan "Jim" Moore Much too young to feel this damn old!! | |||
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DRR Sportsman![]() |
Edelbrock/GMPP heads have some of the smallest combustion chambers but require pistons that are specifically made for them, their squirrely chamber doesn't work with many domes of either variety. Organized people are just too lazy to look for their $h!t. | |||
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