New motor break in time - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nheller76 · 08-04-2013, 02:21 AM

So I just put a 355 with in my truck and its about time to start prepping and getting her some run time. So the block is not new but my cam is so what should I do to get her ready to get on the road. I'm getting the oil pump primed soon and I'm wondering how long I need to have her run before moving her. Any masters at this and what should I do?
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Redcap · 08-04-2013, 02:27 AM

20 minutes above 2500rpm.

gchemist · 08-04-2013, 09:57 AM

Follow these procedures. http://www.73-87.com/7387garage/driv.../newengine.htm

SCOTI · 08-04-2013, 11:10 AM

I agree w/the steps suggested in that link but will add that break-in oil & additives are a must if you're breaking in a motor w/a hydraulic flat tappet type cam.

I filled the oil filter w/the additive & topped it off until full w/break-in oil. Fill the crank case up w/the remaining break-in oil. Get the valves set as close as possible & timing as well. You want it to be able to start quickly & do the initial cam break-in w/o fuss.

INSIDIOUS '86 · 08-04-2013, 01:56 PM

20 min idle it 2300-2800 rpm. Varying it as Time passes after ten min it's when you know all is well.
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nheller76 · 08-05-2013, 12:33 AM

So foot on the pedal for 20min that works
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INSIDIOUS '86 · 08-05-2013, 01:01 AM

If you want to sit there. I usually start it up and usd the idle screw to keep it there and vary the rpm every five min to splash lube different parts of the cam.

Make sandwich have a beer. Watch the temp and the oil press and enjoy watching your newbies come out wondering what's going on haha
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nheller76 · 08-06-2013, 01:35 PM

Yea I will definitely have Neighbors come out I don't have an Exhaust on it yet! I'll let u guys now how it's going when I get there.
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gchemist · 08-06-2013, 02:14 PM

Keep a water hose handy to spray down the radiator if it starts to heat up.

nheller76 · 08-06-2013, 02:42 PM

Quote:

Originally Posted by gchemist

Keep a water hose handy to spray down the radiator if it starts to heat up.

Smart idea I don't want it to overheat

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nheller76 · 08-06-2013, 02:42 PM

Quote:

Originally Posted by gchemist

Keep a water hose handy to spray down the radiator if it starts to heat up.

Smart idea I don't want it to overheat

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INSIDIOUS '86 · 08-06-2013, 03:17 PM

Quote:

Originally Posted by nheller76

Yea I will definitely have Neighbors come out I don't have an Exhaust on it yet! I'll let u guys now how it's going when I get there.
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That's how I do all my engines haha. Reminds my neighbors to be thankfull I do out exhaust on mine. Last time it was a freinds big block and it shook and rattled the neighborhood

You can say thier jimmies were rustled when he left with cutouts open and a John force burnout haha.
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tgh117 · 08-07-2013, 08:16 AM

Mine was so loud without the exhaust, I actually had ear muffs on when I went back into the garage and adjusted the idle and checked on the vitals.

Its pretty neat to hear it purring like that, and have people walked up and be like what do you have going on in there?!?

08-04-2013, 02:21 AM	#1
nheller76 Registered User Join Date: Sep 2012 Location: salem oregon Posts: 281	New motor break in time So I just put a 355 with in my truck and its about time to start prepping and getting her some run time. So the block is not new but my cam is so what should I do to get her ready to get on the road. I'm getting the oil pump primed soon and I'm wondering how long I need to have her run before moving her. Any masters at this and what should I do? Posted via Mobile Device __________________ Faith and Patience with my truck, that is what i pray for every day! See my build http://67-72chevytrucks.com/vboard/s...d.php?t=580013

08-04-2013, 02:27 AM	#2
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: New motor break in time 20 minutes above 2500rpm. __________________ '77 K35 - 454, SM465/NP205, 4.56 D60/14bFF

08-04-2013, 09:57 AM	#3
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: New motor break in time Follow these procedures. http://www.73-87.com/7387garage/driv.../newengine.htm __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-04-2013, 11:10 AM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: New motor break in time I agree w/the steps suggested in that link but will add that break-in oil & additives are a must if you're breaking in a motor w/a hydraulic flat tappet type cam. I filled the oil filter w/the additive & topped it off until full w/break-in oil. Fill the crank case up w/the remaining break-in oil. Get the valves set as close as possible & timing as well. You want it to be able to start quickly & do the initial cam break-in w/o fuss. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

08-04-2013, 01:56 PM	#5
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: New motor break in time 20 min idle it 2300-2800 rpm. Varying it as Time passes after ten min it's when you know all is well. Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

08-05-2013, 12:33 AM	#6
nheller76 Registered User Join Date: Sep 2012 Location: salem oregon Posts: 281	Re: New motor break in time So foot on the pedal for 20min that works Posted via Mobile Device __________________ Faith and Patience with my truck, that is what i pray for every day! See my build http://67-72chevytrucks.com/vboard/s...d.php?t=580013

08-05-2013, 01:01 AM	#7
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: New motor break in time If you want to sit there. I usually start it up and usd the idle screw to keep it there and vary the rpm every five min to splash lube different parts of the cam. Make sandwich have a beer. Watch the temp and the oil press and enjoy watching your newbies come out wondering what's going on haha Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

08-06-2013, 01:35 PM	#8
nheller76 Registered User Join Date: Sep 2012 Location: salem oregon Posts: 281	Re: New motor break in time Yea I will definitely have Neighbors come out I don't have an Exhaust on it yet! I'll let u guys now how it's going when I get there. Posted via Mobile Device __________________ Faith and Patience with my truck, that is what i pray for every day! See my build http://67-72chevytrucks.com/vboard/s...d.php?t=580013

08-06-2013, 02:14 PM	#9
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: New motor break in time Keep a water hose handy to spray down the radiator if it starts to heat up. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

08-07-2013, 08:16 AM	#13
tgh117 Crazy Join Date: Apr 2005 Location: Emmaus, Pa Posts: 203	Re: New motor break in time Mine was so loud without the exhaust, I actually had ear muffs on when I went back into the garage and adjusted the idle and checked on the vitals. Its pretty neat to hear it purring like that, and have people walked up and be like what do you have going on in there?!? __________________ 77 SB Stepside in a bunch of pieces scattered around the garage.



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