Porting GT-40P Upper and Lower with a Dremel

keakua · 06-24-2002, 10:33 PM

definately wouldn't recommend it. especially trying to make larger ports throughout the intake. unless you have access to a flowbench, there is no way to measure the effects of your cuts and 99% chance that you would probably only result in causing more turbulent airflow into your heads loosing more power then if you had left it alone. I dont think that there's no way you could get enough accuracy to visually grind away with the dremel. porting anything is a science left up to machinist with access to flowbench. thats why companies charge an additional $800 to port heads. what you can do though is port-match your lower intake to the heads. take off the lower, put some layout dye like prussion blue around the head intake ports, then bolt it up without gaskets and let it sit for about 10 minutes. then pull off the lower again and you will be left with a good outline of the intake ports on the head, which should be bigger. grind away on the outside of the head to match the intake port and blend it in the best you can. be carefull not to take off to much, i would grind only up to a couple mm's away from the layout from the dye.

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06-24-2002, 10:33 PM	#3
keakua Registered Member Join Date: Jun 2002 Location: phoenix, az Posts: 20	definately wouldn't recommend it. especially trying to make larger ports throughout the intake. unless you have access to a flowbench, there is no way to measure the effects of your cuts and 99% chance that you would probably only result in causing more turbulent airflow into your heads loosing more power then if you had left it alone. I dont think that there's no way you could get enough accuracy to visually grind away with the dremel. porting anything is a science left up to machinist with access to flowbench. thats why companies charge an additional $800 to port heads. what you can do though is port-match your lower intake to the heads. take off the lower, put some layout dye like prussion blue around the head intake ports, then bolt it up without gaskets and let it sit for about 10 minutes. then pull off the lower again and you will be left with a good outline of the intake ports on the head, which should be bigger. grind away on the outside of the head to match the intake port and blend it in the best you can. be carefull not to take off to much, i would grind only up to a couple mm's away from the layout from the dye.