ARP Head Studs, Block Studs & Rod Bolts

[gespinal0301]

Hey guys, I'm planning on an m42 turbo build sometime in the future. I was wondering why doesn't ARP (official site) not have anything listed for the m42, but VAC does? The prices are more expensive for the m42 than the m50, even though it's less hardware. Also, would the m50 hardware fit the m42? Just wondering to save some $$$

[dude8383]

The m42 is pretty stout... unless you're going super high boost the stock main's and rod bearing bolts will be plenty strong enough.

Having said that, the main bolts are m10x75 so that would work but the rod bolts wouldn't... the m42 has a 47mm rod bolt vs the 44mm m5x/s5x bolt. You could probably get away with it as long as you get the rotating assembly properly balanced. The head bolts appear to be the same sizing as well.

[varg]

I believe the M50 and M42 head studs are the same. I have the head studs sitting in my disused M42 and I'll sell them to you if you want. You don't really need the rod bolts if you aren't going to be building a high-revving engine, mine saw 7,500rpm quite a lot and it was fine, doesn't make more power revving that high anyway.

[gespinal0301]

I'm looking to put down 240whp-280whp, so I figure 12-14psi should be enough to do it. My motor is at 200k, so I need to refresh it for sure I figured might as well do it once and have peace of mind.

I haven't written anything down yet, but I was planning on doing the following:
ARP hardware
main & rod bearings
360 thrust bearings
possibly pistons to lower c/r
rings
balance rotating assembly
springs/valves
late model timing case
new timing chains & guides
gaskets & seals

Pretty sure I'm missing some things, I'm doing some DSP for school right now so I'm slightly distracted lol

Btw Varg did you graduate? Never got a chance to meet you and I haven't seen the e30 around campus

[varg]

Nope, haven't graduated yet. I always park in the garage near the stadium, once in a while near the newer engineering building.

[gespinal0301]

Nope, haven't graduated yet. I always park in the garage near the stadium, once in a while near the newer engineering building.

I tend to hit the second floor of EE and study in one of the labs. We should defintely try meeting up, I'm heading to Georgia for an internship this summer so maybe when the semester ends we can set something up. I need to interrogate you about MS & turbo stuff lol