will shaved heads work with stock length pushrods?
- Thread starter dmc919
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white 89 GT
Member
If you have the pedistal mount rockers then use these
Ford Racing M-6529-A302 - Ford Racing Rocker Arm Pedestal Shim Kits - summitracing.com
Ford Racing M-6529-A302 - Ford Racing Rocker Arm Pedestal Shim Kits - summitracing.com
I have to ask;
What was your quench before you machined the heads, and what is your quench after?
Another question;
Was your pushrod length correct to begin with?
One more;
What's your piston to valve clearance?
From my experience, and experiences of others smarter than I, using a thicker gasket to "fix" pushrod length issues is ignorant.
What was your quench before you machined the heads, and what is your quench after?
Another question;
Was your pushrod length correct to begin with?
One more;
What's your piston to valve clearance?
From my experience, and experiences of others smarter than I, using a thicker gasket to "fix" pushrod length issues is ignorant.
Maryland Stang
Active Member
.030" is significant. You should check the geometry. I think you'll find the rocker arms pushing off towards the exhaust side of the head with the stock pushrod even with shims.
I have to ask;
What was your quench before you machined the heads, and what is your quench after?
-it's e7 heads on a non ho motor with dished pistons
Another question;
Was your pushrod length correct to begin with?
-they are stock length 6.25" i believe
One more;
What's your piston to valve clearance?
-exhaust is .160" and intake is .040". i'm notching the pistons for the intake
From my experience, and experiences of others smarter than I, using a thicker gasket to "fix" pushrod length issues is ignorant.
What was your quench before you machined the heads, and what is your quench after?
-it's e7 heads on a non ho motor with dished pistons
Another question;
Was your pushrod length correct to begin with?
-they are stock length 6.25" i believe
One more;
What's your piston to valve clearance?
-exhaust is .160" and intake is .040". i'm notching the pistons for the intake
From my experience, and experiences of others smarter than I, using a thicker gasket to "fix" pushrod length issues is ignorant.
saleen9973
Member
- Aug 5, 2001
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I had my e7's shaved .030 and used a fel pro 1011-2 gasket which i think is .039 thick. Used the stock pushrods and have no problem. Then again i dont rev my car past 5200 rpm. I will be taking the valve covers off this winter to put new sheet metal ones on i will have to check the geometry.
I'm surprised intake gasket issues haven't been asked?
In my experience, mating surface angles may and may not be an issue with .030". More than that, I'm pretty sure some more machining will be required.
sounds like that would be on the edge of not working.I have seen motors with the heads milled .020" with running a 1011 (which is .039 vs the stock .047) and it needed a shim (don't remember how much)
saleen9973
Member
- Aug 5, 2001
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I had thought it may be a problem with the intake not fitting properly. I even asked my machinist and he told me to check. I checked and everything worked out o.k. but that is just my setup everyones is a little different. You must check everything while you are putting it together, i just got lucky.
saleen9973
Member
- Aug 5, 2001
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Sorry i have no pictures of the runners, my machinist told me to get a coat hanger and put it down the runners and feel if it catches between the head and intake. Well it didnt, it was smooth in every runner, so i bolted it up. When my valves were closed the rocker tip sat just a little back from the center of the valve stem.
if you use a thicker head gasket it kind of defeats the purpose of having the heads shaved. check the pushrod length, there is no way that anyone could tell you if its gonna work or not, there are too many variables and when it comes to building a motor there is no cookie cutter answer
rd
Founding Member
I have 020 milled heads on my 82, (Iron Gt40's) and I run the stock pushrods and stock stamped bolt down rockers with no problems.
I actually installed the smallest shim when I put it together, and then, during some other tuning, took them out. Its run that way for 10 years, and will spin to 6k every time.
Best is to set it up and check it, then decide.
I actually installed the smallest shim when I put it together, and then, during some other tuning, took them out. Its run that way for 10 years, and will spin to 6k every time.
Best is to set it up and check it, then decide.
saleen9973
Member
- Aug 5, 2001
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Black1987Stang
Active Member
You can't go by how well it runs, it could be running way off on the valve stem and it could run perfect for your expectations, unless you did a compression test or did a back to back dyno with the differences but theres still to many variables. You'll only be able to truely know by covering the top of the valve stem with a sharpie then assemble it and turn it over a few times. that will show where it's running.....I would just check it you can just check one intake and exhaust then you know how many shims to put for all the rest.
white 89 GT
Member
Yeah I thought it might do that, I like to run as close to zero lash as possible, only tight enough to keep it from making noise. Helps keep the compression up.
Just buy the .030 shims and you will be back to where it belongs.
Just buy the .030 shims and you will be back to where it belongs.
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