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Old 05-23-2012, 09:34 PM   #1
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About to buy some RR's

And I cant remember if they are 3/8 stud or the 7/16 stud. I really dont feel like pulling a valve cover either to find out unless I absolutly have to... (its my DD)

thanks
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Old 05-23-2012, 09:39 PM   #2
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Quote:
Originally Posted by wc3john
And I cant remember if they are 3/8 stud or the 7/16 stud. I really dont feel like pulling a valve cover either to find out unless I absolutly have to... (its my DD)

thanks
What heads do you have?
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Old 05-23-2012, 09:41 PM   #3
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Re: About to buy some RR's

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What heads do you have?
That'd be important wouldnt it lol,

they are the 3-bar GT-40's.
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Old 05-23-2012, 09:46 PM   #4
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You need 5/16 pedestal mount rocker arms
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Old 05-23-2012, 09:50 PM   #5
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You need 5/16 pedestal mount rocker arms
Here
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Old 05-23-2012, 09:52 PM   #6
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Sorry here's the 1.7 rr's
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Old 05-24-2012, 10:56 AM   #7
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Re: About to buy some RR's

Awesome, I have the e cam however so i'll think i'll play it safe with some 1.6's. Also, I want new lifters (since I didnt replace the old ones when I installed the cam) and im looking for a max rev @ 6,500. Got any good lifter choices?
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Old 05-24-2012, 12:22 PM   #8
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Re: About to buy some RR's

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Awesome, I have the e cam however so i'll think i'll play it safe with some 1.6's. Also, I want new lifters (since I didnt replace the old ones when I installed the cam) and im looking for a max rev @ 6,500. Got any good lifter choices?
The factory lifters will do that easy enough, but the ECU (at least mine does) limits the revs to 6250.
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Old 05-26-2012, 06:36 PM   #9
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Re: About to buy some RR's

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The factory lifters will do that easy enough, but the ECU (at least mine does) limits the revs to 6250.
I've had it tuned by our good sponsors AM, they said it was now around 6500 to 7.

As far as they'll do it easily enough, I dont mind spending the money to "over" build it. Peace of mind for me is worth billions

---------- Post added at 06:36 PM ---------- Previous post was at 06:31 PM ----------

Also, any particular head studs/ head gasket's I should use? Im thinking ARP head studs but I dont know which ones as far as size and what i'd have to do to get them to work with the heads
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Old 05-26-2012, 07:42 PM   #10
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Re: About to buy some RR's

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Originally Posted by wc3john View Post
I've had it tuned by our good sponsors AM, they said it was now around 6500 to 7.

As far as they'll do it easily enough, I dont mind spending the money to "over" build it. Peace of mind for me is worth billions

---------- Post added at 06:36 PM ---------- Previous post was at 06:31 PM ----------

Also, any particular head studs/ head gasket's I should use? Im thinking ARP head studs but I dont know which ones as far as size and what i'd have to do to get them to work with the heads


Have you verified that it will go over the 6250?


If you plan on a high revving engine go for lightweight valvetrain pieces Comp or Crane Cams should have what you need. I like Comps, Pro Magnum Rocker Arms, but you would have to convert your heads to studs to use them. These Comp Roller Lifters should handle anything you throw at them.


ARP studs should work just fine, normal 5.0/302 size is 7/16", but most aftermarket heads use 1/2" which would require a special stud or tapping out the block head bolt holes to 1/2". I imagine the GT40 heads use 7/16" bolts?


Standard Fel-Pro head gaskets should work unless you are planning to supercharge it, then you may want to have the heads cut and use their "o-ringed" gaskets.
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Old 05-26-2012, 08:51 PM   #11
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Re: About to buy some RR's

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Have you verified that it will go over the 6250?


If you plan on a high revving engine go for lightweight valvetrain pieces Comp or Crane Cams should have what you need. I like Comps, Pro Magnum Rocker Arms, but you would have to convert your heads to studs to use them. These Comp Roller Lifters should handle anything you throw at them.


ARP studs should work just fine, normal 5.0/302 size is 7/16", but most aftermarket heads use 1/2" which would require a special stud or tapping out the block head bolt holes to 1/2". I imagine the GT40 heads use 7/16" bolts?


Standard Fel-Pro head gaskets should work unless you are planning to supercharge it, then you may want to have the heads cut and use their "o-ringed" gaskets.
No i havent verified but I guess they will be getting a call tuesday morning.

I dont know if the gt40'suse 7/16''s... Will have to try that as well.

I was figuring the comp cams lifters and ultra-gold rr's but didnt see any in that size. hence why I asked the original question at the top of the post
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Old 05-26-2012, 09:21 PM   #12
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Re: About to buy some RR's

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No i havent verified but I guess they will be getting a call tuesday morning.

I dont know if the gt40'suse 7/16''s... Will have to try that as well.

I was figuring the comp cams lifters and ultra-gold rr's but didnt see any in that size. hence why I asked the original question at the top of the post
I have been doing some reading about Dyno tests of 5.0 engines.
For the most part and unless they have been highly modified almost all of them produce their peak torque in the 4800-5500 RPM range. The HP is similar, but sometimes creeps onto the 6000-6500 RPM range depending on the engine build components.
If that is the case revving them over 6250 won't do you much good anyways.


I bet the GT40 heads use 7/16" if they are originally off of a 5.0/302.
If (and I don't know if any ever were) they were originally on a 351W then they would require 1/2" head bolts.


Are you considering aluminum heads any time soon?
If so, then I don't think I would bother buying a set of rocker arms for the GT40 heads and save that money back for a set of stud mounted rockers instead. Or, for now convert your GT40 heads to be able to use stud mounted rockers, which would work when and if you ever got better heads.


The RR arms I mentioned above are actually lighter and stronger than aluminum ones.
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