302 valve springs

dcstang67 · 10-24-2003, 05:03 PM

I'm building a 1990 302 roller engine to put in my 1967 mustang.I was wondering if anyone had any suggestions on valve springs and rocker arms or any other parts. I am using a motorsport e303 cam with ported,gasket matched, and oversize valves (1.85"/1.55") in gt-40P heads, and speed-pro forged pistons with reliefs. Should I use 1.6 or 1.7 rocker arms?

billheis · 10-24-2003, 09:56 PM

Both Crane and Comp cams have 5.0 specific springs that will handle 550 lift that come with retainers and keepers (crane does I know because thats whats on mine) Since you have aftermarket pistons you could go wit h1.7s

Coupe50h · 10-25-2003, 12:34 PM

I DONT have aftermarket pistons, and run 1.7's on top of the e-cam, you'll be fine, i have some comp cams springs i bought without retainers, i'll have to look for the part# if you want it.
my stock retainers were smaller then the aftermarket's, but still run on the car today with no problems.
So i spent about 70$ on the springs, and gained some hp.

10-24-2003, 05:03 PM	#1
dcstang67 Registered Member Join Date: Oct 2003 Location: Uxbridge, MA Posts: 8	302 valve springs I'm building a 1990 302 roller engine to put in my 1967 mustang.I was wondering if anyone had any suggestions on valve springs and rocker arms or any other parts. I am using a motorsport e303 cam with ported,gasket matched, and oversize valves (1.85"/1.55") in gt-40P heads, and speed-pro forged pistons with reliefs. Should I use 1.6 or 1.7 rocker arms?

10-24-2003, 09:56 PM	#2
billheis Registered Member Join Date: May 2001 Location: Fernandina Beach, FL 32034 Posts: 178	Both Crane and Comp cams have 5.0 specific springs that will handle 550 lift that come with retainers and keepers (crane does I know because thats whats on mine) Since you have aftermarket pistons you could go wit h1.7s __________________ Bill Heiser 90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter

10-25-2003, 12:34 PM	#3
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	I DONT have aftermarket pistons, and run 1.7's on top of the e-cam, you'll be fine, i have some comp cams springs i bought without retainers, i'll have to look for the part# if you want it. my stock retainers were smaller then the aftermarket's, but still run on the car today with no problems. So i spent about 70$ on the springs, and gained some hp. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

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