Vortec 350 block vs old 350 block. 6 rockers. Apr 14, 2012 · How different are the Vortec 350s from the original 350s? Will all of the same Edelbrock, Holley, etc parts for the 350 work in them or do they need there own parts? Dec 7, 2019 · There will be a night and day difference with the Vortec. 3's develop their HP and Torque throughout the mid and high end of their RPM band, gives them alot better "get up and go" than the old 350's. All done at 5200rpm. Aug 5, 2019 · I understand the later Vortec blocks had the 1 piece rear main seal and no holes for the mechanical fuel pump, and a different timing chain cover? Please correct me and educate me on this! My question is, what are the key differences between the 2 blocks, and would a Vortec 350 block work with the correct legacy block parts? Oct 9, 2024 · I would not waste my time trying to upgrade a 307 and would simply replace it with a 327 (my favorite small block) or a 350. . An intake manifold for vortec heads will be needed. 3:1 to 9. Last 3 numbers 395 and has a blue paint mark by the timing gear. 350 vortec 880 casting and 906 or 062 heads. atfhp wpbud paqpsswj eqp hnylo lzsv ohrus xykve irclj kvtbeb