mayhem
Well-Known Member
OK, so I'm ready to purchase valve springs & need some knowledgeable opinions.
Engine is a 500" Indy Maxx alum block, 10.5:1 CR, 426-1 CNC 285 Legend heads, 426-3 intake drilled & plumbed for EFI & 4500 throttle body. Car is a full frame all steel '72 Challenger, D60 (gear selection pending) on leaf springs, 727 w/manual valve body, 3500 stall (for now). Car will be primarily street driven w/minimal turning (lol).
The cam is a hyd roller: 236/240 @ 050, 564/555 lift & 112 LSA. My guidance from Rich Nedbal's book is 130-165# on the seat & 280+ open. I'm looking at 2 different springs at the moment: (1) [email protected] on the seat & [email protected] open with 1.135 bind, 0.755" max lift or (2) [email protected] on the seat & [email protected] open with 1.175 bind, 0.665 max lift. Either of these make sense or is there a better spring out there & why? Thanks in advance for any assistance.
Engine is a 500" Indy Maxx alum block, 10.5:1 CR, 426-1 CNC 285 Legend heads, 426-3 intake drilled & plumbed for EFI & 4500 throttle body. Car is a full frame all steel '72 Challenger, D60 (gear selection pending) on leaf springs, 727 w/manual valve body, 3500 stall (for now). Car will be primarily street driven w/minimal turning (lol).
The cam is a hyd roller: 236/240 @ 050, 564/555 lift & 112 LSA. My guidance from Rich Nedbal's book is 130-165# on the seat & 280+ open. I'm looking at 2 different springs at the moment: (1) [email protected] on the seat & [email protected] open with 1.135 bind, 0.755" max lift or (2) [email protected] on the seat & [email protected] open with 1.175 bind, 0.665 max lift. Either of these make sense or is there a better spring out there & why? Thanks in advance for any assistance.