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Just a thread to inform everybody in the market about these rockers. Here's a few things I've learned while performing the install on these rockers. I figured I'd post this up as the company informing the customer seems to be very lacking.
I bought the Yella Terra Platinum adjustable roller rockers: Model #YT 6333
First off, the only thing they tell you about on the website is this:
There's alot more to it than just this.
Second, even with 0.020" milled heads, .045" Head gasket and running the S1X NA cam which should be close to a stock base circle, I need longer pushrods. How much? How about 7.430" or about .38" longer than stock. I expected to run properly sized pushrods anyway, but I figured I'd inform the public for those looking into something like this in the future.
Third, valve cover clearance. Yella Terra offered valve cover spacers a few years ago for these rockers but no longer offer them. Height is not just the thing to consider, these rockers are big honking pieces of kit. The stock rockers have an angle at the top of the head. The YT6333's have a flat head as they have an adjuster nut at the top. See pic:
With this taken into consideration, the stock tapered valve covers will not cut it even when using another valve cover flange as a spacer. I picked up scratch marks on my freshly sandblasted valvecovers right on the edge of the adjuster nuts and this hits right dead center of that tapered area. Tease has these rockers installed on her car and has a set of fabricated valve covers to allow for the clearance. Something many people don't want to do or are willing to spend the cash on it.
So with this you might need to look into wider valve covers that go all the way to the perimeter of the flange instead of inside the flange area and maybe with less of an angled taper. I am looking into this right now and will report my findings in this thread.
I bought the Yella Terra Platinum adjustable roller rockers: Model #YT 6333
First off, the only thing they tell you about on the website is this:
Originally posted by Yella Terra
Second, even with 0.020" milled heads, .045" Head gasket and running the S1X NA cam which should be close to a stock base circle, I need longer pushrods. How much? How about 7.430" or about .38" longer than stock. I expected to run properly sized pushrods anyway, but I figured I'd inform the public for those looking into something like this in the future.
Third, valve cover clearance. Yella Terra offered valve cover spacers a few years ago for these rockers but no longer offer them. Height is not just the thing to consider, these rockers are big honking pieces of kit. The stock rockers have an angle at the top of the head. The YT6333's have a flat head as they have an adjuster nut at the top. See pic:
With this taken into consideration, the stock tapered valve covers will not cut it even when using another valve cover flange as a spacer. I picked up scratch marks on my freshly sandblasted valvecovers right on the edge of the adjuster nuts and this hits right dead center of that tapered area. Tease has these rockers installed on her car and has a set of fabricated valve covers to allow for the clearance. Something many people don't want to do or are willing to spend the cash on it.
So with this you might need to look into wider valve covers that go all the way to the perimeter of the flange instead of inside the flange area and maybe with less of an angled taper. I am looking into this right now and will report my findings in this thread.
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