Summit Racing lifters

dartfreak75 said

I was looking at their website the other day and they have 2 different micro trols part numbers too. One is 71977 and the other is 71977pr the pr ones are cheaper and are listed as performance replacements. Not sure what the difference in the two are?

Click to expand...

71977PR are not micro-trols, those are just the "Performance Replacement" lifters they offer. That's the kind that comes with most of the their cam kits and has a wire retainer. Those are just the standard lifters, they may be "performance replacements" compared to stock but they're not high performance lifters.

The 71977's are the micro-trols, they have the c-clip retainers. They're the higher performance lifters