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HEADSUP113 02-21-2012 05:14 PM

Restrictor plates
Any input ? Sbc, flat top piston, 10/1 550 hp, 750 hp carb 1 power valve, vic jr, runs 11.0o.we have run this combination for 5 years with out issue, we tryed using a restrictor plate to race index and the one time we did it worked however after the 5th pass we lost a head gasket and after the tear down found # 8 piston was missing a 1/2 x1/4 inch piece off the outer edge, no other damage. Most of the plate people ive talked to said it has nothing to do with the plate ! But its strange that it never happend before and its been 2 years since that happend, and we race almost every week. Dont want to lose a motor ? Any thoughts

1320racer 02-21-2012 05:19 PM

Re: Restrictor plates
I've been using a restrictor plate since 2008 to kill about 100HP of my 900+HP BBC while logging 250+ passes a season. Your issue has nothing to do with the plate.

HEADSUP113 02-21-2012 05:33 PM

Re: Restrictor plates
thanks ed i knew u would be the 1st to answer this ill call u for details (pat)

1320racer 02-21-2012 05:46 PM

Re: Restrictor plates

HEADSUP113 02-21-2012 08:37 PM

Re: Restrictor plates
Yes. Mikes car

1320racer 02-22-2012 06:21 AM

Re: Restrictor plates
Pat, you're aware of my setup, but for those following along that aren't, I'm posting this reply from another thread...

"when running a 4150 carb, there is no better than the adjustable restrictor plate manufactured by Willys and sold through Summit, Jegs and others.

Been using this plate since 2008. Previously to slow my 9 second Chevelle to 10.0 and since 2009 to slow my 8 second Firebird to 9.0 enabling me to run 9.0x all season long at every track I compete.

This 1" 4 hole plate has 18 turns of adjustment in it from fully open 1.75" bore(s) to 1.00"

Each turn is worth ~.04 and can easily kill 100HP.

Nothing to take apart or swap out, couldn't be easier or simplier. Adjustment(s) take a few seconds and are infinitely adjustable.

Several competitiors and friends are now using it on their 8 to 11 second rides to slow them to make ET cutoffs and/or index classes as well I know of 1 former Division 1 Super Street Champion now using it after hearing about and seeing it in use on my car."

wally54 07-03-2012 12:36 PM

Re: Restrictor plates
Hey Ed......

After reading this thread I purchased this product wow does it work nice and nobody is the wiser...Now with that said have you ever had a problem with it closing up after you set it on it's own. The only thing I have done is put a rubber plug on the screw to make it look like a vacuum plug.

Thanks Glenn..

1320racer 07-04-2012 10:37 PM

Re: Restrictor plates
Glenn, yes when I first started using in 2008. The fix is a drop or two of Loctite on the screw, running it all the way in and out and it will now stay put.

wally54 07-14-2012 02:13 PM

Re: Restrictor plates
Thanks Ed ...I will give that a try..

Wilson1 08-16-2019 03:41 PM

Re: Restrictor plates
I run a 1050 4500 at altitude and want to slow it down from 8.4 to 9.0 so I can run Pro. I am going to build my own plate. Does anyone have any idea where I should start for hole size. The carb is 2.25 inch now.. I was thinking about 1.75 or 1.68??? Anyone??

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