Yup! Due to the geometry of a roller and the stock block limit of a .842" lifter a solid lifter lobe as I posted can kick the valves open faster initially, but for the spring pressures needed to attain 7000 rpm or so the only advantage in running a roller in the 600 hp range is the start of the slight reduction in fiction.
Number 48 casting heads where never used on production 428 motors be they HO combo's or not, the number 46 casting on 360 hp 2 bbl 428s are often mistaken for number 48s!
If a 428 did slip out of the factory with number 48 heads it done as a one or two of situation so as to not tie up / stall the assembly line .
This has been seen many times as in the case of a late run motor that came stock with one 6X casting and one 5C casting.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
|