Bolt length for 3500 upper

[3400-95-Modified]

I have a 3500 upper with spacers right now and I need to know what length bolt I need to get to opt out the spacers... I need to have them trimmed down and I know I cant use the bolts that are there now. Issac? how long are the stock bolts?

[Superdave]

If he dosen't i will measure my stockers tonight. i replaced them the other day with allen head ones.

[ForcedFirebird]

65.5mm

[IsaacHayes]

2.565" (65mm) long, M8 1.25 thread pitch

From my 3500 plenum swap checklist thread.

I've heard shorter (60mm?) worked too, and I think that's a common size in hardware stores.

[3400-95-Modified]

Thanks, Eric on bstuff measured his for me too...

Damn spacers are too thick for a beretta with firm solid mounts... LOL maybe old and saggy bishes would be ok...

[ForcedFirebird]

2.565" (65mm) long, M8 1.25 thread pitch

From my 3500 plenum swap checklist thread.

I've heard shorter (60mm?) worked too, and I think that's a common size in hardware stores.

The threads are about 60mm, so I would imagine 60mm would be fine.

[Superdave]

Yep, mine are 60mm long.

[IsaacHayes]

Dave, your stock or your allen ones? I'm running 65mm bolts.

[Superdave]

Dave, your stock or your allen ones? I'm running 65mm bolts.

the allen ones

[3400-95-Modified]

I've had polished allen ones since my first hybrid build... I also got some of the longer ones for the spacers too.

[IsaacHayes]

I don't think allen head bolts would look good on my plenum. It would look cool yes, but take away from the chevy logos attention. I think flange bolts would look better than the plain ones I have on there now though. Painted black of course.

[3400-95-Modified]

Why does it look like your throttle bracket is at perfect height... Mine seems like it was too low... I got it to fit but after bending it quite a bit to go above the PCV tube...

its almost like my TB adapter plate sits lower than yours where the bracket bolts to...

[3400-95-Modified]

I'm pretty embarrassed about this install right now... It needs some work and I'll be getting to that before Bfest... I need a new 45* pipe for after the TB to put the nos nozzle in right and have a good bend there again... And I need to re route a few other things as well as get the plug for the new map so I can start using that.





My sticker makes it faster, its a corvette company... LOL

[IsaacHayes]

Holy shit! Yeah that's not right. I had to bend mine but it was just SLIGHT to get the bottom to bolt up. I mean it was so tiny of an adjustment I could of just used the bolts to pull it down.

My adapter was from when it was first offered/made. It's square, not fancy like the new ones. Yours does not seem right at all... I would get a different bracket or re-bend yours back and put some bolt spacers to raise the bracket up... The PCV hold down had to even be bent on yours!!!

[3400-95-Modified]

I have too look at this whole thing again... this is another reason why I really didnt want to do this whole 3500 plenum... shit is just never right... if this spacer is wrong I'm really going to be pissed... I hate having to half ass things in there to make it work. ARRRRRGGGGGGG