for those that don't go on the other board....

[Steve Wood]

I am assuming if they are a lightweight alloy, they expand quite a bit more than something like the old TRW forgings?  Rattle when cold?

[earlbrown]

They're forged so they're going to make a little noise at cold startup.   They do require more room than a hyper but .003"ish cold isn't that bad.

That's one of the reasons I avoided using 2618 for the forging.

[Steve Wood]

that's not bad at all

[earlbrown]

I expect to catch some flak for not using the ''better'' 2618 material....


...but we've been making over 100hp a hole for decades now with a stock high mileage cast slug.   Stepping up to a forging (and losing weight) is a leaps and bounds improvement no matter the material.   I chose less noise and lower price over unnessessary overkill.


The uber badass series bidness slugs 2.0 are in the works with the 2618, but that's going to me more of a racing slug for a ''street'' car in quotes.

[Steve Wood]

I agree with you