springs

[coilwire]

I am building a 429 for my 71 mach 1 and am unsure if i have to go with heavier front springs. Right now I have a 351C in the car

Thanks

Jim

 

[sicndhed]

I don't know the specifics for your engines but in general shifting to some aluminum and headers for the big block can sometimes eliminate the need to swap springs. FEs get much lighter with aluminum heads and intake. Not sure how much is saved on a 385.

 

[mjlan]

How is your car equipped? A 351C with A/C, PS and auto trans might be close.

Have a look at the chart...

Mustang replacement coil spring chart.pdf

 

[coilwire]

Thanks for the replys and the chart. Should help a lot.

The car was originaly an a/c car with an auto trans. Have been racing the car up until a year ago. The mach is going to be a driver during the warm months

Jim

 

[73mach1]

The eaton spring web site shows the same spring for a 429 and a 351 without ac. 1 ,MC1278 * without/AC Standard Duty 418 2, MC1278 * with/AC Standard Duty 418 .The first is a 351,2nd is 429.That being said, it's probably not a bad idea to replace them after 44 years if you can work them in the budget.

 

[Duncan Mach72]

My Mach1 had 351C 4v + air con, so I believe it came with the stiffest springs. Air was stripped out years go. Handling with 351C was good. With a mostly stock 429 (ally intake but iron manifolds & iron wp) it's ok to drive but I would prefer it to be be stiffer. The front end feels more ponderous in turns, you have to think more about what it's doing all thru the corner if you try to carry any speed. Hopefully this year I will get some stiffer springs & maybe anti-roll bars. I have KYB gas-a-just dampers atm but I will be fitting some adjustable Spax ones I acquired.

 

[TommyK]

I am running the 560 lb 1" lowering spings from NPD and a 1 1/8" sway bar. My car is just a cruiser. No complaints.