Exhaust Manifold Bolts...What Size????
04-11-2002 | 02:41 PM
#1
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From: Sacramento/Marysville, Ca
Exhaust Manifold Bolts...What Size???? I asked a couple people if LS1 exhaust manifold bolts were standard sbc 3/8 and the answer I got was yes....So I ordered ARP header bolts for sbc and received them today and they dont fit. The stockers look like fine thread and they are metric. Anyone know what size they are and are they fine or course thread? TIA
-Dave
2000 Z28 M6
-Dave
2000 Z28 M6
04-12-2002 | 04:21 PM
#5
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From: Sacramento/Marysville, Ca
Re: Exhaust Manifold Bolts...What Size???? I figured out what size they are....8mmx1.25 and they are 1 3/16 long...ARP doesnt make any bolts this size but they do offer studs...Now I just have to decide if I want to run studs, stock bolts, or those POS stage 8 bolts...flip a coin I guess...
-Dave
-Dave
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04-13-2002 | 10:07 PM
#8
Re: Exhaust Manifold Bolts...What Size???? I just ordered some stock replacements. Just anti-sieze them and everything should be fine. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Eric
Eric
04-15-2002 | 01:25 AM
#10
Re: Exhaust Manifold Bolts...What Size???? Ron, I sent you an email. Get back in touch with me so I know you got it. I got a whole big list of suggestions for ya. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
ERic
ERic
03-05-2020 | 09:11 PM
#11
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Joined: Oct 2019
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LSx exhaust manifold bolts For LSx motors, they are M8 1.25 x 30mm....at least that's the size I need for my 08 Suburban 5.3. Ihad to get mine at True Value because Home Depot didn't have much of a selection of metric stuff and what they did have was more expensive than it should have been. Also, just an FYI the metric equivalent to what folks call grade 8 bolts in standard is metric 10.9. They are the best quality as far as I can tell. I got them to use on the engine cradle I bought from Jegs to hold my LSx motor. Overkill I know, but the Chinese bolts that came with the cradle had me a little concerned. If I ever put an engine and tranny on that cradle I'll replace all the hardware that came with it as a cheap insurance policy.
Last edited by Kendall Gifford; 03-05-2020 at 09:13 PM. Reason: additional information
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V8 Supra Builder (11-03-2020)
03-05-2020 | 11:17 PM
#12
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Joined: Jun 2016
Posts: 21,587
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From: Central Cal.
For LSx motors, they are M8 1.25 x 30mm....at least that's the size I need for my 08 Suburban 5.3. Ihad to get mine at True Value because Home Depot didn't have much of a selection of metric stuff and what they did have was more expensive than it should have been. Also, just an FYI the metric equivalent to what folks call grade 8 bolts in standard is metric 10.9. They are the best quality as far as I can tell. I got them to use on the engine cradle I bought from Jegs to hold my LSx motor. Overkill I know, but the Chinese bolts that came with the cradle had me a little concerned. If I ever put an engine and tranny on that cradle I'll replace all the hardware that came with it as a cheap insurance policy.
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V8 Supra Builder (11-03-2020)
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