I don't think the billet caps are needed if it's just High Rpm you're looking at, mine was around the 550rwhp mark and never showed any signs of Block stress, I know Duane runs stock caps at 1000rwhp.
I had a 7M Crank cut down to a Cosworth counterweight profile, this dropped it slightly under...
Worth opening it up and check the diaphragm, knockoffs usually have a cheap nasty one that can be replaced with a genuine part.
(only moving part in there so the only thing that might click)
So you add mass to the valvetrain and still run the risk of spitting a stock shim out at high rpm.... not good.
As mentioned earlier I ran my 7M to the 8300 hard cut just about every time I drove it without an issue other than the broken spring early on.
Need to find a smarter/friendlier dealer.....
Shim Under as far as I know still uses a standard Bucket/Shim?
One word of caution though DO NOT CRYO the Shimless buckets... it'll end in tears..
Comes down to nozzle size which is set by the AR, a 1.06ar T3 GT35R and a 1.06ar T4 GT35R are identical in performance the only difference being the flange shape and bolt holes.
By all means do :)
Maybe when I replaced my rheo panel it was the amplifier that fixed my issues the second time, 1st time all I changed was the blue box and that sorted the issue but it may have been something under the dash I moved/reconnected that "fixed" it and nothing to do with the AC amp!
So you don't engineer in ground loops, don't get whine through the sound system don't ever get into a situation where the pump/s run at less than optimum... :nono:
I had the AC Amplifier fail on my car way back...
Blue Box over the glovebox, also had the Temp rheostat fail another time which caused simular symptoms.
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