740 Turbo Brick

iTrader: (2)

Just bought a set of Kelford 272 cams to replace the BC272s that were in the car when I bought it. Previous owner installed them with stock springs/retainers so Im getting upgraded ones for these cams. While looking for springs I figured the best bet would be the GSC valve spring kit. I looked up the specs and the maximum valve lift for GSCs is 11.2 mm. The maximum lift for the cams is 11.0 mm. Should I be worried about this? I dont know if 0.2mm is enough clearance before bottoming out or if I should just buy the Kelford spring set and use those. I believe the max lift on those ones was 13mm.

sssr20det510

http://www.amsperformance.com/cart/G...Moly-Seat.html
It says 12.2

740 Turbo Brick

iTrader: (2)

http://www.ebay.com/itm/GSC-03-06-MI...tR0So9&vxp=mtr

It must have something to do with upgrading the retainer set too then. I was just going to do the springs because I dont really plan on revving out to the moon or running over 26 psi. This set says 11.2 max lift because of stock retainers..

TrendSetter

iTrader: (1)

if they spec 11.2 theres very likely some extra room in there for manufacturing tolerances and such.
they wouldnt sell them as 11.2 max lift if they didnt work at 11.2. you are fine at 11.0

740 Turbo Brick

iTrader: (2)

Ok I was just worried about bottoming them out at higher RPM, I don't think .2mm is much to play with

LetsGetThisDone

iTrader: (1)

If they bottom out, the valves are floating.

They'll be fine.

740 Turbo Brick

iTrader: (2)

Oh shoot I didn't think of it like that, good call. Ok well I guess I'll be ordering GSC beehives next week then. Maybe retainers further on down the line. Thanks guys

CurseDSM

iTrader: (3)

Id order the kiggly springs and retainers over the gsc even though I believe they are made by the same company

kikiturbo

I used both and they are of completely different design... Kiggley having a thick base below and GSC using the stock thin washer..

CurseDSM

iTrader: (3)

I an well aware of both myself I make valve springs for a living I know how they come. That isn't to say PAC doesn't make them differently being they don't really make a specific spring for our cars. Most of them are overhead cam mustang springs.