look for an injector shop, they can clean and flow test so they are balanced set. should be under $20 per.

 

i would still find or make a bolt for that hole thats a little longer to grab some good threads

 

Some of the intake bolt holes go into the coolant jacket and coolant will seep up the threads - hence the reason to use sealant.
As suggested, you might get a stud and use vice a bolt then this will transfer the friction of threading from the internal head threads to the stud external threads - less 'pull' on head threads.

 

You need 1.5 times the diameter of the bolt of good threads to ensure a permanent repair. With aluminum heads you really should not cut that any closer. You have to be careful just getting a few threads. The pressure under the head of a bolt on a hot engine can be 3 time as much as when you torque a cold bolt.

For me its drill tap, install a stainless thread repair insert, better then new.

 

This seems a bit out of my league and i dont want to screw up the head since i have zero time or budget to deal with that. I used a 3/8 tap and got no luck creating a thick enough thread. Im not sure how to use that stud/nut technique you guys are mentioning. I also tried a longer bolt and its not enough to hold it down, soon as i go to torque it, it just keeps spinning

I guess ill have to go the heli coil route? Should i get a helicoil kit that is 3/8 as well or go a size up? Seems like i could widen it out to 7/16 maybe?

 

keep it the same size, the coil will take up room so hole will need to be larger. the right sized drill bit should come with the kit you want. some just have the coil and no tool or bit.

 

Read the reviews from below. Step one: is know what size and pitch bolt you are working with. Last thing you want to do is to put the wrong heli coil in there. There are larger repair insert than Heli around but they can be a pain with hand tools.

If you are worried find a junk pc of aluminum and do it a few time before

https://www.amazon.com/Helicoil-5521.../dp/B0002SRDUU

The straighter the drill hole and the straighter the tap starts the better everything will go back together.

 

Awesome, i was reading the reviews and i feel pretty comfortable doing this. So my last question since i dont want to put the wrong size in like you mentioned. The 95 LT1 engine has the 3/8 bolts, is it correct to assume i use that thread size helicoil kit? I used the tap and die set i have and was able to create a thread to get the bolt to hold even though it still wiggled but i think it may be thick enough to hold the coil

Thanks

 

Your the repair kit is based on the thread size you are repairing. I assume you do not have a thread pitch gage, in which case you can get a parts manual and look up the bolts pitch. It is most likely 3/8-16

You need
X drill Bit (.397 dia)
Tap will be like .46 dia 16 TPI

Course verify everything before you buy.

 

Thanks Gorn!