Lifter quality isn't all that great these days and from what I've seen here leaving a lot of room under the plungers will pretty much guarantee a "ticker" or two in the bunch, at least if you have my luck with this sort of thing.
That is NOT what the customer wants to hear after you talked him into the $1200 roller lifter "upgrade" so I run my engines tight-lashed to take that deal out of the equation. If you get away with leaving a ton of room under the plungers that's great, but more times than not you'll end up with a noisy valve train once the engine is well heat soaked and oil thinned out some......FWIW......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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