1.6 or 1.7 rocker arms?
 

Next up, for the short term, is upgrading my rocker arms (should've been done when I did my heads, but oh well)......w/ what I currently have, knowing I'm gonna be s/c next year - what size/make should I get and why - 1.6? 1.7? Crane? FMS? Thanks for your replies in advance.

------------------
'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

1.6 is the way to go, as it allows for future cam changes (more lift) without worrying about piston to valve clearance. I think any brand will do, as nobody seems to have rocker quality issues no matter brand they are running. How much do you want to spend should help you decide hear.

------------------
1993 GT/AOD
'93 Mustang GT

I've heard that before.....but I was thinking bigger (1.7) might be better. So, w/ the 1.7's I could have valve/piston clearance problems? Hmmm, didn't know that. Thanks. With the alum r/a's, should that give me 2-3 extra hp? Thanks.

------------------
'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

i would use the 1.7's. why? well because they give you more lift. the statement of being able to change cams to get more lift is ok but with the rockers you will get that extra lift you want with no problem. and you will be able to keep the low duration which will help you make power.

low duration makes more power? interesting comment.

You dont need the 1.7s with an aftermarket cam, which you have. 1.7s are for people who dont want to change thier cam.

you have edelbrock heads and the e-cam (which is the same as the edelbrock cam that they sell in their performer package). The heads dont flow much over .5 lift, and the e-cam has .498 I think. In the future, if you want to change cams, you will be buying 1.6 rockers more than likely. Most cams are designed to run with 1.6 rockers, and their lift numbers are advertised with 1.6 rockers.

------------------
1993 GT/AOD
'93 Mustang GT

I agree with Mach 1...get the 1.7's if you are running the stock cam. 1.6's with an aftermarket cam, just select a cam that provides the lift that works well with your combo.

------------------
fordgasm
CLICK HERE to see my 87 GT

Ya, you want 1.6rr with the E cam. I agree with those above that said so. You only want 1.7s if you have a stock cam or have a really custom engine (ie, designed with 1.7s in mind, flycut pistons, high flow heads, etc.)

You only want 1.7s if you want more lift out of a cam that you aren't willing to change. They're basically a bandaid. If you're designing an engine, it's best to get a cam that gives you the lift numbers you want with 1.6 ratio rockers. That will make your engine much more sturdy.

What Mach 1 and Fordgasm said are dead on.

------------------
351W 89 Mustang GT Convertible

[This message has been edited by jimberg (edited 05-21-2001).]

Thanks again guys.....1.6 it is!

------------------
'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

just out of couriousity whats the difference between 1.6 and 1.7 rockers other than the lift ratio? they're band aids? for what? and low duration doesnt exactly make more power but motorsport cams have high duration to begin with so going with a bigger cam will cause you to lose power due to excessive duration( which does what people?) so if you want more lift but need to keep the cam you have then use 1.7's. but, im sure for your motor 1.6's will be good.