BerniniCaCO3
03-07-2011, 02:58 AM
Hi!
Doing my HO/gt40 rebuild now, just ordered almost everything on Friday.
I'm getting valve seals as a matter of course, and I'll be regrinding the valve faces and, I think -if I have the equipment at school- the seats as well. I'm replacing springs and keepers.
I was wondering if it would be good practice to replace the rockers?
Kindof by accident (bought the e7te heads, then a block from another guy who threw in 2 sets of heads, and THEN found gt40s at the scrapyard) I have more stock rockers than I know what to do with. Between the rockers with 60,000 miles on them, the rockers with 110,000 miles on them, and the unknowable junkyard rockers-- frankly I couldn't tell the difference. They're all stained brown with oil, except that little spot where they rub against the valve stem; and that little spot is not perceptively deeper in any one rocker over any other despite the mileage difference.
Can I gather then that, unlike springs and valve seats, rockers might last forever and not need replacing?
That's the first question.
Should I change out the rockers? I'm doing almost everything else... but if I don't need to, that's another $100 for something else in the build.
Second question, if I DO change out the rockers, worth going roller? Comp camps made a 1.72 ratio pedestal (stock compatible) roller rocker at some point, it seems there are several sets on ebay at all times for ~$150 used. Right now a fellow is selling his used set with the claim that they have 30,000 miles on them, not bad, lower than any of the stamped steel stock ones I've got, by half.
Worth bidding $150 for 'em? I'm not looking to excel @5000rpm, but lighter and lower resistance are better at any speed I figure, and replacement stock stamped steel are almost $150 anyway.
Do roller rockers wear out any faster, seeing as they have more moving parts? That would be my one concern with buying used ones; are they as long lived as stamped steel stock?
thanks for the advice!
Doing my HO/gt40 rebuild now, just ordered almost everything on Friday.
I'm getting valve seals as a matter of course, and I'll be regrinding the valve faces and, I think -if I have the equipment at school- the seats as well. I'm replacing springs and keepers.
I was wondering if it would be good practice to replace the rockers?
Kindof by accident (bought the e7te heads, then a block from another guy who threw in 2 sets of heads, and THEN found gt40s at the scrapyard) I have more stock rockers than I know what to do with. Between the rockers with 60,000 miles on them, the rockers with 110,000 miles on them, and the unknowable junkyard rockers-- frankly I couldn't tell the difference. They're all stained brown with oil, except that little spot where they rub against the valve stem; and that little spot is not perceptively deeper in any one rocker over any other despite the mileage difference.
Can I gather then that, unlike springs and valve seats, rockers might last forever and not need replacing?
That's the first question.
Should I change out the rockers? I'm doing almost everything else... but if I don't need to, that's another $100 for something else in the build.
Second question, if I DO change out the rockers, worth going roller? Comp camps made a 1.72 ratio pedestal (stock compatible) roller rocker at some point, it seems there are several sets on ebay at all times for ~$150 used. Right now a fellow is selling his used set with the claim that they have 30,000 miles on them, not bad, lower than any of the stamped steel stock ones I've got, by half.
Worth bidding $150 for 'em? I'm not looking to excel @5000rpm, but lighter and lower resistance are better at any speed I figure, and replacement stock stamped steel are almost $150 anyway.
Do roller rockers wear out any faster, seeing as they have more moving parts? That would be my one concern with buying used ones; are they as long lived as stamped steel stock?
thanks for the advice!