hi guys

i have been using an os tr r spec and so i thought id dom some light porting on the piston liner.

all i did was make the normal grooves people do to make the fuel more direct. since this porting the engine has been wanting to run richer. i had first left the engine at its normal tune and when i ran the car it blew 3 plugs and was running crazy lean....

im not sure if this sounds weird or if its normal ? the tr used to finish a 5 minute heat with just less than half a tank of fuel, now its using much more fuel than normal.

thanks for your help
John