This is topic valves hitting on decked 6025 heads? w/ 1.7 RR and F303 in forum Tech Talk at Northern California Ford Owners  .


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Posted by SVT Fox (Member # 1837) on :
 
heads are performers 6025s then been shaven down twice now from warping. I was installing my ford/crane 1.7 RR and on about the 4th one back the motor would stop. I never torqued it hard or tried to force it. I loosened up everything and it was free again..

The timing is set at 0 on cam gear.

timing? (easy fix)

RR ratio/pushrod lenght? (2nd easy)

camshaft?


I hope i dident bend my new valves!!! or damage a lifter...
 
Posted by F8LSN8K (Member # 7080) on :
 
if its taken apart or ur gonna take it apart, degree the cam at -4 should clear
 
Posted by SVT Fox (Member # 1837) on :
 
thats what people are saying on other forums, My cam was not degreed correctly so I have to fix that. Im going to get a wheel and degree it if retarding it 4 does not work.
 
Posted by turbo50 (Member # 6700) on :
 
Dude, NEVER go off of what people say. Set it up and do a piston to valve clearance check. Do it the right way and do it once.

Way too much money in that combo to skimp.

You are INSANE to skimp on this.

You do understand that just turning the motor over and it clearing has NOTHING to do with piston to valve clearance.

There are so many things going on in the MOST important piece of you motor, the valvetrain.

There are valve harmonics, especially if that is an off the shelf edelbrock, there are piston to valve radiuses to be checked etc.

Here is a link that will help (if you are unfamilar with this)and you can call me anytime. I have done this millions of times.

Also degreeing the cam +/- dramatically changes your power band and just makes no sense unless you are doing it for a specific reason.

I dont mean to sound harsh, but I am trying to help out a fellow enthusiast.

Dan

http://sbftech.com/index.php/topic,57.0.html
 
Posted by turbo50 (Member # 6700) on :
 
Also if you need to flycut the pistons, I can do this for your or show you how or send you a link. The tools are expensive for what you need done and it is labor intensive but well worth it. I have the tools for 2.02 but not for 1.90 or 1.60, however I will be purchasing them shortly for 1.90 and 1.60 even though I have never had an exhaust valve come close to hitting on a non 17 or 23 degree twisted chamber SBF head.
 
Posted by SVT Fox (Member # 1837) on :
 
i can assure you Im not putting it back together unless I know its correct. I have 1.6 exhaust 1.9 intake. Im calling the shop that decked them.
 
Posted by turbo50 (Member # 6700) on :
 
quote:
Originally posted by SVT Fox:
i can assure you Im not putting it back together unless I know its correct. I have 1.6 exhaust 1.9 intake. Im calling the shop that decked them.
Ok.....but you can save yourself the time and hassle of removing the shortblock and taking it to a machine shop to be flycut by doing it yourself. If you put the cam in, degreed it and put the heads on yourself, then you can definitely check PTV clearances.

Im here if you need any help.
 
Posted by turbo50 (Member # 6700) on :
 
Also,
Something to consider. If you are at 0 clearance now (interference) with a 1.7 rocker then going to a 1.6 rocker will net you 40 tho clearance on the high side and 20 tho on the low side. You want at least 80 tho on the intake side. FYI.

Also most rockers 1.7,1.6 etc are machined with allowable tolerances so when you actually measure it can be up to 1.648 or so actual ratio and still be put into a package and sold. Can be a good and a BAD thing for you..

Something to remember.
 
Posted by SVT Fox (Member # 1837) on :
 
I know my cam is not the best choice for my setup, Would getting a custom grind be the best choice as this point?
 
Posted by SVT Fox (Member # 1837) on :
 
i just realized that some of the valves, the ones that were hitting, those lifters are not compressing and in turn the valve was slightly open when rockers got torqued down...
 
Posted by turbo50 (Member # 6700) on :
 
quote:
Originally posted by SVT Fox:
i just realized that some of the valves, the ones that were hitting, those lifters are not compressing and in turn the valve was slightly open when rockers got torqued down...
Id still check and double check PTV. Just the fact that the motor spins over and doesnt contact is not good enough man.

You can check PTV head on or head off. Worth the time.

Glad you found one issue.

You can play with headgasket thickness and yes, if you know what your interference is you can have a cam custom ground around this. Gonna have to give alot of info to the cam grinder.

Try Jay Allen at http://www.camshaftinnovations.com/. He will need your valve springs specs and about 1,000 other pieces of information.

That cam will run like a raped ape and perform better than any OTS cam more than likely.

Co$t money tho..

Good luck.
 




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