Oil restrictors for Small Block Chevy

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71 Nova
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Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Oil restrictors for Small Block Chevy

#1 Post by 71 Nova » Mon Oct 13, 2014 10:43 pm

My son and I are putting together a 377 Small Block Chevy for drag racing and limited street use (it's 10 miles to the drag strip from my son's house). It's a relatively high rpm motor (cam peaks at 7800 rpm). Solid roller Comp cam, SS roller rockers, 400 block, AFR alum. heads, COLA 4340 crank, Lunati rods, Manley pistons @ 13:1 compression. We are thinking of using oil restrictors in the oil galleys (the block came with them), but I have heard conflicting info on whether or not to use them, drill them out, leave o-rings off, etc... What experiences or recommendations do you guys have with them? :scratch:
Ken
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

bracketchev1221
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Joined: Fri Oct 11, 2013 7:59 pm
Location: Mountville PA

Re: Oil restrictors for Small Block Chevy

#2 Post by bracketchev1221 » Tue Oct 14, 2014 6:49 am

I don't use restrictors in anything. I feel its better to oil the valvetrain and control drainback and pan windage.

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supernova
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Re: Oil restrictors for Small Block Chevy

#3 Post by supernova » Wed Oct 15, 2014 8:04 am

I have used restrictors in everything!!!! And have had not one problem with the use of them. I even have them in my Dart block now. The only thing I do different is I drill them out bigger. Most if not all restrictors have a .060 hole in them, I drill them out to .100 for more oil flow but not flooding the top...... :thumb: :thumb: :thumb:
Blackhoodmafia!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs

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71 Nova
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Re: Oil restrictors for Small Block Chevy

#4 Post by 71 Nova » Thu Oct 16, 2014 9:21 pm

Thanks guys.

Supernova, do use o rings on the restrictors?
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

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supernova
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Re: Oil restrictors for Small Block Chevy

#5 Post by supernova » Thu Oct 16, 2014 10:42 pm

yes
Blackhoodmafia!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs

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Craig W.
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Re: Oil restrictors for Small Block Chevy

#6 Post by Craig W. » Wed Nov 05, 2014 9:36 pm

I had to drill mine out to .125" to keep from burning up the pushrods.
Craig Watson
2QuickNovas Racing
5.27@130

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