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 Post Posted: Sat Mar 13, 2010 9:58 am 
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I have a set of Edelbrock RPM's for my 350. I called Edelbrock to ask for the CC size, what gasket they recommend and some other stuff since I bought them used. The guy told me I needed .100" longer pushrods since the heads have a thicker deck. I called again yesterday because my kids colored on the sheet that I had the numbers on, and that tech told me I didn't need longer pushrods, just hardened for the guide plates.

Those that have aluminum heads, what is correct??? ](*,)

Thanks!

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 Post Posted: Sat Mar 13, 2010 10:20 am 
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i have darts and i use the standard length with no problems

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 Post Posted: Sat Mar 13, 2010 11:37 am 
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.100" isn't a lot, and I figured the first guy was trying to make a sale, since he was recommending everything I'd need from Edelbrock. I just searched the numbers over at Jegs when they do that. Sometimes I can find it cheaper there, under a different brand name.


Edit: A tech from Jegs just emailed me and said I do need them .100" longer.

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'87 Aero SS Pretty much stock except for the exhaust.

1985 Monte Carlo SS: '99 Vortec 5.7L TPI/2004R, 8.5" Posi w/3:42's

KMJ Performance is a ripoff, buyer beware!!


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 Post Posted: Sat Mar 13, 2010 11:43 am 
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i read before that edelbrock heads require .100 longer push rods.

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350 .060 over
dart pro 1's
B&M 162 blower
750 demon
turbo 350 3500 stall
12 bolt 456 gears


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 Post Posted: Sat Mar 13, 2010 4:27 pm 
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Location: Canton Mi.
Set your valve train geometry and see what you really need.


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 Post Posted: Sat Mar 13, 2010 9:23 pm 
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lilbowtie's correct. You need to check Valvetrain geometry to be sure. Decking the Block, milling the Heads & Valve Seat height etc.. will affect Pushrod length.>>>>
http://www.chevytech.com/3c3o1.html

Most aftermarket aluminum Heads do require +.100" longer pushrods because they have thicker Decks.


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 Post Posted: Sun Mar 14, 2010 12:02 am 
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lilbowtie wrote:
Set your valve train geometry and see what you really need.



School me please. I've never heard of that, but I'm willing to give it a try!!

Scott.

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'87 Aero SS Pretty much stock except for the exhaust.

1985 Monte Carlo SS: '99 Vortec 5.7L TPI/2004R, 8.5" Posi w/3:42's

KMJ Performance is a ripoff, buyer beware!!


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 Post Posted: Sun Mar 14, 2010 9:25 am 
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Comps cams does a good job of explaining, go to there web sight and look under the Tech pages and then Technical Info and you will see Valve Train Geometry. The valve train is probably most neglected area that needs a lot of attention - spring, coil bind, spring height, rocker contact, rocker clearance, push rod length, guide plates - take time - make it right.


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 Post Posted: Sun Mar 14, 2010 10:35 am 
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I read the article!-buying a length checker!! 8)

Thanks!

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'87 Aero SS Pretty much stock except for the exhaust.

1985 Monte Carlo SS: '99 Vortec 5.7L TPI/2004R, 8.5" Posi w/3:42's

KMJ Performance is a ripoff, buyer beware!!


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 Post Posted: Sun Mar 14, 2010 2:03 pm 
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MalibuRacing Junkie
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lilbowtie wrote:
Set your valve train geometry and see what you really need.



X2! There's no way a sales tech can tell you for sure with all the variables involved like rocker arms, cam, head gaskets, core shift, valve length, valve seat height...

Tommy

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