9550

this is what im talking about. standard looking iron gt40 spring area yes?

barnett468

your spring area is stock and not modified. but i was so caught up in your springs i forgot to mention. you can not run any type of perf cam with these heads because your compression is too low. you need around 9.5:1. if your heads ate not p's you need to mill .025" off from stock and run thinner head gaskets. do it now that they are off, you will thank me later. am i gonna need some more beer for this round, i'm ready, lol.

barnett468

wow, if they are single springs there should be no machining required. let your shop check it out.




look in the comp catalog they should have some. look for the proper inside diameter.




it's not a big deal but its bogus.




yes, on the early hi po heads they had a lip on the outside to trap the spring.




ok, i'm goin back to the bar, lol. you buy spring "cups" from summit by manley or other mfg.




tis the season to be H A M M E R E D, fa, la, la...

barnett468

i'm guessing that you realize that the comp cam you are installing is smaller than the f303 and has a lower rpm operating range? it will have a bit more bottom end.

9550

thanks Barnett.
I'm actually hammered right now.

at the moment, I'm leaning toward buying a set of ford springs to do the job and return the comp springs. single springs, not dual like these comp cam springs.

I plan to call comp Monday morning and try and sort it all out though.

I'm worried that my machine shop guy is just a machine shop guy and isn't aware of the potential that the inner spring may pull the stem seal off the top of the guide.

so picture this, for these comp springs, let's say the outer spring clears the raised part on the head, and the inner spring rests on the top of the raised part. is that a bad idea?
my machine shop guy says it will be fine, but all the evidence I have found says it needs to be milled flat. that's why I'm worried.

I think if my machine shop guy is just a machine shop guy and I give home the ford springs, he can't screw anything up.

9550

yeah I realize. the f cam was put in with the supercharger. supercharger is gone. somebody here recommended this one.

barnett468

hi,

don't worry about the outside of the spring. it need to be snug on the id with the raised platform and sit on top of the lower platform not on the outside of it. this is simple, if it had single springs then just measure the od of the raised platform on the retainer. it should be near the same as the platform on the head.

a machine shop guy cam screw up anything. spring set up is easy for those that know how but impossible for those that don't.

Again, as long as they end up close to what i suggested you are fine. you do not want or need closed pressure greater than 135. it will be hard on the valve train and beat your valves and valve seats to death.

if it is less than around 118 the valves might bounce as they close at high rpm. ohhh.

what did you not like about the 303 cam. the comp you listed is a good one but both need compression.

are ypou going to increase your compression as i suggested?

9550

so you're saying I dont necessarily have to machine the raised part flat? that's good news.I have no problem with shaving a little off the head surface to bump compression, but in not sure if I can find a thinner gasket. I'm using the felpro 1006. they have the loc wire for my grooved heads. I took a vote on whether I needed to use the loc wire or not. was like 5-1 that I needed to use it.

9550

I still didn't buy a caliper. Will do it tomorrow and post some measurements.

barnett468

not with single springs, no way no how.



ok, i mentioned that if you shaved your heads your lock wire groove would not be deep enough so it will need to be re-emachined.

if milling the heads .025" from ORIG, removes the groove in the heads then either regroove them for the loc wire or just use the std gaskets but the thin ones i mentioned. i will get you the part number.



wrong, wrong, wrong, wrong, wrong, but i would buy hi perf ones.