Upgraded springs?

[Cal35]

I have ported gt40 heads and I was wonder what springs would be good for stock cam and 1.7 crane energizer rocker arms with hardened pushrods? I have read that the valves float after 5,500 rpm with the stock springs just looking for a good upgrade.

 

[Win]

I've always used Comp cams on any of mine.

 

[Cal35]

I've always used Comp cams on any of mine.

Comp Cam dual valve springs
1.430 O.D.
outer .697 I.D. Inner???

 

[Win]

Have you converted your heads yet to a screw in?

 

[RichV]

If the heads are from a Explorer they need upgraded springs. If they are from a Cobra, they will be fine. I have GT40p heads with TFS stage 1 springs IIRC. I run a e303 with the 1.7s.

 

[Cal35]

If the heads are from a Explorer they need upgraded springs. If they are from a Cobra, they will be fine. I have GT40p heads with TFS stage 1 springs IIRC. I run a e303 with the 1.7s.

http://www.summitracing.com/parts/CRN-44308-1/ these work good?

 

[SLOW95GTS]

http://www.latemodelrestoration.com...low-50l-302-Mustang-Valve-Springs-Upgrade-Kit