The Ford Barn - View Single Post

Bored&Stroked · 08-14-2019, 09:59 PM

If it was mine, I'd go with the LZ springs from Van Pelt and install them at about 2.0625 - should give you about 65 lbs on the seat . . . more than enough for almost any cam in the .375 lift range. I don't have the numbers for "on the nose" pressure . . . but it is probably closer to 180 lbs.

Flatheads don't have rockers or many moving parts - so we don't use a lot of spring pressure. There is really no need to run even 80 lbs on the seat - unless you're going to put some boost into it or rev it higher than 5500.

In my 32 Cab, I have a very stout street engine with a roller cam with .420 lift and very aggressive profiles, I run about 90 lbs on the seat . . . but that is also on a hardened 8620 billet and with a roller lifter - so I'm not worried about that sort of spring pressure wearing out the cam.

08-14-2019, 09:59 PM	#7
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,064	Re: FH Valve Springs If it was mine, I'd go with the LZ springs from Van Pelt and install them at about 2.0625 - should give you about 65 lbs on the seat . . . more than enough for almost any cam in the .375 lift range. I don't have the numbers for "on the nose" pressure . . . but it is probably closer to 180 lbs. Flatheads don't have rockers or many moving parts - so we don't use a lot of spring pressure. There is really no need to run even 80 lbs on the seat - unless you're going to put some boost into it or rev it higher than 5500. In my 32 Cab, I have a very stout street engine with a roller cam with .420 lift and very aggressive profiles, I run about 90 lbs on the seat . . . but that is also on a hardened 8620 billet and with a roller lifter - so I'm not worried about that sort of spring pressure wearing out the cam.