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red 6 cylinder flywheel bolts

Started by _SLR Goat_ , Jun 03 2010 07:16 PM

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10 replies to this topic

#1 _SLR Goat_

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Posted 03 June 2010 - 07:16 PM

Is there anything special about red 6 cylinder flywheel bolts can i buy them from a bolt shop? would getting some high tensile 3/8unf bolts be fine?

Edited by SLR Goat, 03 June 2010 - 07:22 PM.

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#2 greens nice

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Name:Kevin
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Posted 03 June 2010 - 07:38 PM

i wouldnt try them, they would either not get enough stretch or they would snap.
just put 7/16 bolts in them, ARP 351 Nascar bolts dont need cutting.

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#3 _oldjohnno_

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Posted 03 June 2010 - 07:46 PM

Is there anything special about red 6 cylinder flywheel bolts can i buy them from a bolt shop? would getting some high tensile 3/8unf bolts be fine?

Yes, flywheel bolts are special. Apart from the very high tensile strength material the hex head is grooved in a way that evenly distributes the forces/stresses. I use ARP p/n 206-2802; they're easily available. Normal grade 8's might do the job in a standard engine (for a while at least) but I wouldn't push my luck with anything that revs a bit. Socket heads (like unbrakos) are higher tensile than grade 8 but are also more brittle so again would be risky with anything other than granny's church car..

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#4 _SLR Goat_

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Posted 03 June 2010 - 08:08 PM

Cheers guys will suss out those arp bolts dont think i need 7/16 its not a big reving engine just a daily mild 186 and m20 4 speed better off being safe dont think having a flywheel come thru the floor would be fun

cheers dennis

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#5 piquet

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Posted 03 June 2010 - 09:40 PM

I would not recomend the use of those bolts for my flywheel I have tried them and they do not have much clamping area on the surface of the flywheel. Lay one along side a GMH flywheel bolt and you will see exactly what I mean
cheers
peter

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#6 Heath

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Name:Heath
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Posted 04 June 2010 - 12:05 PM

A big head will be preferable in any situation

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#7 _oldjohnno_

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Posted 04 June 2010 - 07:54 PM

Yeah I know what you're saying, and the six point GM bolt certainly looks a lot bigger than the 12 point ARP bolt. But if you measure the actual seating face there's only 20 thou in it. It does seem important though to follow ARP's fitting procedure as it does take 5 or 6 torque-ups before they consistently seat in a consistent orientation.
Anyway, I'm yet to have any flywheels or bolts loosen with the ARP's so I'll keep on using them..

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#8 _threeblindmice_

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Posted 04 June 2010 - 08:35 PM

Cheers guys will suss out those arp bolts dont think i need 7/16 its not a big reving engine just a daily mild 186 and m20 4 speed better off being safe dont think having a flywheel come thru the floor would be fun

cheers dennis

Mate if it makes you feel better , I have had red (street)sixes , XU1 specs or better for over thirty five years ,with no problems using GMH bolts.

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#9 _SLR Goat_

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Posted 04 June 2010 - 08:54 PM

Cheers guys i wasnt too worried about using gmh bolts its i needed some for this weekend and the set i had lined up fell thru and i was going into panic mode but ive being assured i will secure some tomorrow morning