Larger Head Bolts for the Fiat 850 and 600

[Oldbmwr100rs]

Why did you go to an SAE bolt instead of staying with metric?Was there mot enough room to take fitting 10mm bolts? I know this is going on a custom build,but as a mechanic myself when I run across SAE bolts in a metric engine,I usually find them as part of a hack repair. Those were pretty nice looking head bolts though,nicely flanged and shouldered.

[1992whitz1992]

did you have to open up the holes on the head gasket ?

Ash

[jacktheripped]

On my 151 Pontiac I opened the holes from 7/16th to 1/2 inch . Using ARP studs I can torque to 105 lbs on the head studs. The asshat machinest after being told to use the tap and helicoils I provided used his own stuff and put in undersized helicoils and the bastard charged me $15 x 10 holes, $150 for a screwed up job that I had to have fixed at a different shop. let's not talk about how bad he messed up the cylinder head :P

[boxer3main]

that generation of engine, regardless. they all need stuff like this. I literally broke all intake bolts off a subaru..all bolts. same processs, drill tap, widen intake holes...of course american, and you can machine thread tap if to doubt the hole being too big.

[a112CRO]

Nice work as usual,please don't go turbo on your 850 :)

[fiatnutz]

Thanks for the kind words, and I don't plan too. JE...

[MrGuvEuroman]

Do you still "Wire ring" Blocks for Increased pressures or do you not need to nowadays cos of gaskets being better? : )

[fiatnutz]

This is something that can actually be w/o removing the block. O-rings do work, no doubt about it, but so do the larger head bolts.

[masterd151]

Ever thought of throwing a turbo on yours John?

[fiatnutz]

Na, that would put me into some crazy class with cars that are waaaay faster. Turbos are fun, though!