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Guest Message by DevFuse

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helicoil? EA82 carb EDIT FIRST POST

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9 replies to this topic

#1 Guest_baccaruda_*

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Posted 14 August 2003 - 01:01 AM

I'm going to put helicoils in Skeet's car where the exhaust bolts to the heads. What's the kit or size I need please? car is 87 EA82 carb.

NAPA doesn't have the 12x1.25 in their book. Should I just go the next size up? I could go elsewhere but I have been getting a nice discount at this branch :cool:

#2 Guest_tomrhere_*

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Posted 14 August 2003 - 01:21 AM

Another option that I used on my engine, is to use a 7/16"X14 tap in the bolt holes. Screws right in, no pre-drilling required. I followed the starter tap with a bottoming tap, just to get those few extra threads. I'm a firm believer in coarse threads in aluminum, vs fine thread, as there's more meat to grab hold of, and less chance of strippage. Thinking it was archemetis(sp), that mentioned using this size of bolt awhile back, when I posted of stripping out one of the holes. I liked the idea, and went with it. Just my .02......Tom

#3 Guest_x silvershad0w x_*

Guest_x silvershad0w x_*
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Posted 14 August 2003 - 01:50 AM

Otherwise, its a 12mmx1.25mm kit, and they aint cheap! I payed over 40 for my set w/ tap and insertion tool. Dont forget the red loctite! :)

#4 Guest_Flowmastered87GL_*

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Posted 14 August 2003 - 02:00 AM

Something I saw on my car when I bought it... it had BOLTS instead of studs <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/ohwell.gif ALT=":\">

Really now... what is to keep you from tapping out the holes bigger and using bolts instead of studs?

#5 Guest_baccaruda_*

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Posted 14 August 2003 - 09:21 AM


#6 Guest_Flowmastered87GL_*

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Posted 15 August 2003 - 01:42 AM

I just now noticed... 12 MM 1.25 pitch is VERY RARE... I tried to buy a tap for it to re-do my shifter for my short shift conversion... but no dice... (its the same as the shift knob actually) (I actually found the ONLY place in town that had one was a motorcycle shop.. paid em $5 to thread my shifter linkage...

So taps and dies will be HARD TO FIND and expensive. going up to the next size may really be simpler and cheaper... just enlarge the holes in the Y pipe a bit.

#7 Guest_x silvershad0w x_*

Guest_x silvershad0w x_*
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Posted 15 August 2003 - 03:03 AM

They should have 12x1.50 which will work perfect with new studs/bolts from the hardware store. Just a bit coarser thread is all.

If you have a real parts store around, they usually have the oddball helicoil kits. Like All Pro, or a locally owned shop.

#8 Guest_MilesFox_*

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Posted 15 August 2003 - 03:08 AM

i have seen a motor with big ol' fat almost lag bolts holding the pipe on. like almost bigger than 1/2 in. diameter.

all my experiences with stripped out holes was due to not having the flange end of the y pipe securely mounted to what was supposed to be a mount off the back of the tranny. them bolts trying to hold all the weight off the head alone is hell on the threads!

#9 Guest_chef tim_*

Guest_chef tim_*
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Posted 15 August 2003 - 04:42 AM

SAE 3/16 exhaust studs with heli-coils work great. Tim

#10 Guest_stephenw22_*

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Posted 15 August 2003 - 09:31 AM

Is M12x1.25 the right size to use to stay at factory stock? The USRM mentions M10x1.25 as the size of the exhaust studs. I'm going to be trying to helicoil my heads this weekend, and I don't want to have to buy both kits, and take the wrong one back later

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