What mod's do you have done to the valve train that will play 7500Rpm ??
around 6900 rpm on stock internals(m42) the valves begin to float... Unless you have upgrades it's asking for surious trouble
i ve done nothing but somehow my engine rev limiter is 7000 rpm ( i dont know why)but i havent faced any trouble (thank god till know)
i have seen ludiagsm reving his engine up to 8500 with a rebuilt bottom end but a completely stock head ...
plus mark d chip claims it increases the rev limiter to 7100 ...
i also had to get into a megasquited m42 while tuning it on the streets and they set the rev limiter to 7200 and they hit it alot !!
not sure about the 7500 but i m whiling to take my chances