Spark plug reach
906 heads with 2" TTI's. Done years ago. Contacted all the major plug manufacturers a couple years ago and as stated above, there is nothing truly compatible in 5/8" and the short 13/16"s are not correct either. No plans to make anything either as most guys are putting on aluminum heads which makes sense nowadays. Number 6 so hard to get too; a young 'wiry' tech friend was able to do get it done. He builds Subaru turbo engines and said the back plugs are so close to the firewall that he's had plenty of practice. Number 7 so close to the tube even a header socket didn't work. Had to use a crowfoot and was a pain. But not something that needs doing often enough to change the heads. Runs super clean and are probably good for the rest of my life. If I were doing an engine today then aluminum heads would be part of the build. Here's a pic of my modified crowfoot:
906 heads with 2" TTI's. Done years ago. Contacted all the major plug manufacturers a couple years ago and as stated above, there is nothing truly compatible in 5/8" and the short 13/16"s are not correct either. No plans to make anything either as most guys are putting on aluminum heads which makes sense nowadays. Number 6 so hard to get too; a young 'wiry' tech friend was able to do get it done. He builds Subaru turbo engines and said the back plugs are so close to the firewall that he's had plenty of practice. Number 7 so close to the tube even a header socket didn't work. Had to use a crowfoot and was a pain. But not something that needs doing often enough to change the heads. Runs super clean and are probably good for the rest of my life. If I were doing an engine today then aluminum heads would be part of the build. Here's a pic of my modified crowfoot:
