F1ZE-AA spring selection

Reply Subscribe

Thread Tools

Search this Thread

Apr 14, 2016 | 12:05 AM

htownoag

Thread Starter

Senior User

Joined: Jan 2013

Posts: 172

Likes: 0

F1ZE-AA spring selection

Ok fellas got the cam ordered. Went with the xe264h 35-349-8 comp cam again. It will go in a gt40 block with 80,xxx original miles. Got the heads off and now im going a different route than the recommended spring on that cam by comp.

Engine is bone stock except for the cam and
1.7 crane rocker arms.

The drop in springs if they are still available will they do me good?

Oh by the way the last combo i was using e7te's with the reccommended spring(987-16). 94 maf 5.0.

Am i lookin at .512. With that cam and rocker ratio.(1.7) or not? That cam says its designed for 1.7 ratio but in the cam specs it says..

"Advertised Duration: 264 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.512 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.512 in.
Valve Lift with Factory Rocker Arm Ratio: 0.512 int./0.512 exh."

So if i am at 1.7 ratio is this correct

.512÷1.6=.32
.32x1.7=.544

(Lift÷1.6)=lift× 1.7= magic number?

Its late my eyes hurt. Proof read as much as i could.

Apr 14, 2016 | 12:59 AM

Willz74

Elder User

Joined: Jul 2015

Posts: 555

Likes: 0

You could also 1.7/1.6x.512=.544

Apr 14, 2016 | 08:46 AM

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

Likes: 1,499

From: Ottawa, Ontario

Yes it would be 0.544" lift with 1.7 rockers but the heads don't flow any more past 0.500" lift so using them would just put more strain on the valvetrain for no reason.. IMO.

Apr 14, 2016 | 07:33 PM

htownoag

Thread Starter

Senior User

Joined: Jan 2013

Posts: 172

Likes: 0

Well i had it on e7s. Im not a track person i just love my ford. Will drive it every day I just want some valve spring information to help me make an educated purchase...