Things to check.
Do the longer bolts thread into the hole without the piece you are try to bolt on? If so you have a alignment problem.
Lay the longer and shorter bolts on each other with the heads pointing the opposite direction. Look to see day light between the threads to check if it is the same pitch.
You might of got bolts made to a larger tolerance, nuts are usually made on the loose side. The intake could have smaller diameter. If so get a die and spin the longer bolts through it to cut it down.
As always, I accept no responsibility for damage occurring from any or all information given by me in this or any post.




PS I loev splel chcek