'78 Heat riser bolt question (1 Viewer)

Chestcutter

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Fixing a big exhaust leak between the manifolds - I found that the long bolts that hold the exhaust to the intake are all non-OEM coarse thread and some appear to have been repaired with helicoils (pic below). Does anyone know what the original bolt sizes were? Tentative plan is to drill out and Time-sert these for fine thread bolts, vs drilling for through bolts.

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For the short two bolts into aluminum from the bottom - Looks like M12 x 1.25 is the right size?
 

73FJ40

After another night of rust removal!
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@Chestcutter

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Bolt Hexagon - Toyota (90101-10486) $1.90 list (special number; can't confirm length or pitch)

Bolt Hexagon - Toyota (90101-10485) NLA (don't know if -10486 is interchangeable)​

Washer Spring - Toyota (94512-01000) $1.21 list​

Bolt W Washer - Toyota (91612-61030) $1.67 list (M10-30mm long; don't know pitch)​


Cheap enough to order OEM and confirm!
 

Chestcutter

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Cheap enough to order OEM and confirm!
Thanks for sending! That is where I was leaning - Looks like 90101-10485 is a longer bolt but all look to be M10 1.25 originally. Was waiting to get the Time-Sert for that size but I guess I'll order while waiting for parts.
 

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