Thumper Guys - Valve Question

[arbailey]

I am getting a set of Thumpers with the upgraded valve springs. I was wondering if, based on my combo, it would be worth it to get the GT-40 valves?

> '88 5.0 LX Coupe, 140K, still speed density w/19lb injectors,
> Densecharger cold air kit, FMS 65mm tb, FMS 67mm EGR spacer, stock
> upper intake (throat opened), Tmoss ported stock lower intake,
> Kirban afpr, Walbro 190lph fuel pump, Stock E7's, FMS 1.6 roller
> rockers, Davis "Firepower" ignition kit, March "Power & Amp"
> underdrive pulleys, FMS unequal length shorty headers, Summit off
> road h-pipe, Magnaflow cat back exhaust, Steeda Tri-Ax shifter,
> Fiore firewall adjuster, Maximum Motorsports clutch quadrant, FMS
> aluminum driveshaft, FMS 3.55 gears, KYB struts & shocks, Hotchkis
> upper & lower rear control arms, Wild Rides "Battleboxes", full
> length subframe connectors, 4 wheel disc brakes

Coming Soon: new RNH Perforance shortblock, Tmoss ported stock upper and lower, Thumper heads, Comp Cams XE264HR cam (.512/.512 lift with 1.6's, 212/218 dur @ .050, and 114 lsa).

 

[srothfuss]

I don't have thumpers head, but I am going to ask you a silly question: Do any aftermarket heads come with tiny valves?

If you have the money - get the larger valves

 

[vikingpower]

Its time to ditch the stock intake as well, even Extrude Honed they dont breathe that well on the top end and with that cam you need more air/shorter runners

 

[tmoss]

Your intake will flow somewhere ~180(+) cfm, enough for that cam for sure........it's been used with that combo sucessfully before.........

 

[thumper460]

LOL...sure they make the heads with bigger valves.. and then there are piston to valve issues.. shrouding issues in the chambers AND in the cylinders.. then there is this whole velocity thing.... IF you want the larger valves in the heads, sure!! How ever the stock valve size is enough to put you in the solid 12s with a 302 n/a and in the 11s n/a with a stroker.... the biggest valve I will install , unless I am beat up about it is the 1.85 and 1.55 as the valve notch in the ford pistons are cut for those... we have seen even the 1.90 valve hit the pistons..!! I dont want ya'll to have a bunch of "OMG issues" I want the suckers on the engine and you kicking BUTT!! but then that is

Just me......................................

Thumper