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Old 05-26-2004, 03:32 PM
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guideplates

i bought guideplates for my smallblock chevy and i know you are suposed to drill the factory cast in guides larger. why do you have to do that it seems that would be better and how big do you drill them, thanks for any info.

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Old 05-26-2004, 05:06 PM
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All I know is that when you add guideplates you are supposed to upgrade to hardened (Heat treated) push rods. The hardened push rods might be larger in diameter because they receive more friction wear than heads without guideplates. Hope this helps!!
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Old 05-26-2004, 05:14 PM
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The factory pushrod slots are generally opened up to with a 7/16" drill when guideplates are added to a small block chevy. Since you now are using a plate to locate the pushrod, you no longer want to use the slots to do it, as the smaller slot could cause binding with your guideplates. You are just creating more clearance for the pushrod by opening up the small slots to a 7/16 round hole.
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Old 05-26-2004, 08:25 PM
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Don't you need to machine stock heads for guidplates? That is what I have always heard. I thought the rocker stud bosses have to be milled down.
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Old 05-26-2004, 09:31 PM
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thanks for the info and yes you do have to have it milled flat but that was allready done since i had screw in rocker studs allready, thanks
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Old 05-26-2004, 09:31 PM
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The reason you need to open up the pushrod guide slot is that with high lift camshafts the pushrod can bind in the slot.
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Old 05-27-2004, 06:43 AM
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Quote:
Originally posted by lluciano77
Don't you need to machine stock heads for guidplates? That is what I have always heard. I thought the rocker stud bosses have to be milled down.
Yes, you have to mill the bosses down. Alot of guys say to mill them down the thickness of the guideplate and the nut on the stud which ends up to be about .375", but I go to .450" with the studs that I use (they have more threads on them than a stock stud).
I've got 12 pair of heads to do this to by monday, and it gets old pulling all of those studs and tapping all of those holes.
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