91stang

quick question... what is the stock rr's? is it 1.6 and just the after market rr's just a better quality?

and with 1.7 rr's what would be the performance difference with a H/C/I upgrade. and would 1.7 rr's work with any head combination?


ok so maybe not as quick as i tho't

marx91

stock rocker arms are 1.6 and they are tappet not roller,
1.7's will work with most heads, exept twisted wedge (trick flow)
roller rockers are less parasitic than the tappet rockers
1.7's will open the valves more

tinman

1.7's need to have enough valvespring for them to work.
If you were runnig a .498 lift cam now and the springs will stack at .510 you will be in trouble. Thats an example.........
Also, you must have enough room when the valve is all the way open for the bottom of the retainer to have .030 clearance minimum from the top of the valve guide.......

91stang

PERFORMER 5.0/5.8L WITH 1.90" INTAKE VALVES
Chamber Size 60cc
Intake Port Size 170cc
Valve Sizes (in/ex) 1.90"/1.60"
Bare (single) #60369
Complete (single) #60379

does this help? it's the edlebrock heads

marx91

i have those heads on my car w 1.7's and a stock block, so yes that will work

stanglx2002

just make sure when you do get the RR get the right ones for your heads if i remember right the Edelbrock heads are stud and pedestal mount so get the right RR with the right heads

91stang

how do you like them?

91stang

and the right RR's would be?