Difference between heads hyd flat vs roller

AJ/FormS said
Hydraulic roller lifters are heavy compared to a FTH. It takes more spring to control that heavy lifter at rpm. I can't say for sure but I have heard that retro rollers for LAs are the heaviest.
I have heard quite a few guys here on FABO complaining about roller lifters. And
have heard a few guys extolling solid rollers.
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I've been running the same hydraulic FTH lifters since about 2004 when I installed a Hughes HE 3038AL cam with specs of 276/286/[email protected], 230/[email protected], and lifts of .549/.571 (1.6 arms) using Hughes 1129(IIRC) dual springs. I've been shifting it at up to 7000/7200. I got no complaints.
jus saying.

For "general principle" and especially "dem kinda" RPMs w/FTH lifters, I bestow upon you a heartfelt :thumbsup::thumbsup:
DOUBLE thumbs up!!

AJ/FormS said
squishys

Now that's a term for FTHs I've never heard...

AJ/FormS said
the lifters have never been squishified

"squishified" ....Is that like nitriding, or treating hot forged steel to some liquid inert gas specialty performance or strength enhancements? No WONDER they rev so high! Lol.
I'm running hydraulic roller lifters and cam in the built-for-performance 421 Tripower in my wife's 65 GTO. The builder picked the cam and lifters from CompCams, and given the RPM range, hand ported smallish valve factory iron heads, they are perfect for that application.
In the 541 stroker I'm planning with a Mopar builder, using a new Bill Mitchell aluminum block as the foundation, but BIG, FLAT, TORQUE as my primary goal, not a towing motor, but for the street and 1320 action, unless they come up with an exceptional argument to do otherwise, I think solid flat tappet lifters are going to be PERFECT for that build. The larger diameter of the Mopar/AMC lifters allow for a "roller-esque" ramp profile, and without the weight and complexity of hydraulic roller lifters, and without the fear factor of stop and go and stop, creeping along in traffic in hot weather of solid rollers, and no need to tear down and rebuild. Just a slug of steel in the bronze lifter bushings, and springs that have enough pressure to handle the cam profile.
I don't even expect to have to check or set lash that often, but I definitely won't have any neuroses about the lifters doing something bad...