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would you brake in a engine with a new six pack?
#1119146
11/22/11 01:23 PM
11/22/11 01:23 PM
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Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
OP
mopar
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OP
mopar
Joined: Jan 2006
Posts: 587
IL . usa
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Hi I was wondering if i should do this or not , I am building a nice street 451 with stealth heads and comps 275hl cam .
It will have a new summit racing six pack kit going on it i know there will be tuning needed. Here is my question will the out of the box set up be OK to brake in a motor or should i use a 4 barrel set up ?
I guess i could by a cheep 383 intake to brake the motor in with one of my known good 750 hp carb but is that a waste of time ? Another problem is may have to machine the intake because the block is decked as are the heads to get close to 10-1 compression .
What is the general thoughts on this ? Or just try and use only the center carb and block off the end carbs?
would to rich of a air fuel be bad on a brake in ? or would to lean hurt it durring brake in ?
Thanks for your advice in advance .
1969 Dodge Charger
1969 Dodge Superbee
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Re: would you brake in a engine with a new six pack?
[Re: cjs69mope]
#1119149
11/22/11 02:21 PM
11/22/11 02:21 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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what's the problem? Why would it be a bad idea? Just make sure your floats are set (have to do that w/ a 4bbl), then make sure your distrib is clocked right, fill the primary bowl up, turn the mixture screws in all the way then out 1.25 turns, turn the idle screw down (so the engine mantains about 2k) and let her rip. Once it's warm turn the idle up to 22-2400 set your timing in full around 36* (vac advance pluged) get your vacuum gauage out and tune for best signal. Once the 20 minutes are up, change the oil and go for a drive. You can leave the outboards un-hooked if you like, but they aren't going to open until your engine goes under "load"
As for cutting the block or heads, sure but make sure the intake will seal before you fire it. If you cut the heads a bunch you'll have to have the intake cut too. I had to have .030 taken off a brand new RPM once.
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Re: would you brake in a engine with a new six pack?
[Re: cjs69mope]
#1119152
11/22/11 02:44 PM
11/22/11 02:44 PM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
Quote:
what's the problem? Why would it be a bad idea? Just make sure your floats are set (have to do that w/ a 4bbl), then make sure your distrib is clocked right, fill the primary bowl up, turn the mixture screws in all the way then out 1.25 turns, turn the idle screw down (so the engine mantains about 2k) and let her rip. Once it's warm turn the idle up to 22-2400 set your timing in full around 36* (vac advance pluged) get your vacuum gauage out and tune for best signal. Once the 20 minutes are up, change the oil and go for a drive. You can leave the outboards un-hooked if you like, but they aren't going to open until your engine goes under "load"
As for cutting the block or heads, sure but make sure the intake will seal before you fire it. If you cut the heads a bunch you'll have to have the intake cut too. I had to have .030 taken off a brand new RPM once.
Yea that is what i was going to do but i was not sure .
I have to get the intake cut on the sixpack so i did not want to cut another 4 barrel one too .
the block was wacked .012 and heads .060 so i was using the old mopar formual {for every .010 off the deck then .012" needs to be removed from the intake side}
Well i come up with .086" off the intake , Not sure if that is total for one side or both .043 on each side =.o86 or .086 on each side?
Seams like alot ! not sure how to get this right . the first time .
It would be .086 off each side , but you also have to take int oa ccount the .012 you had cut off the block , that's the same as cutting .012 more off the heads .
Normally the heads would be cut on the intake side so that the intake manifold itself would not have to be cut , I'll assume the head deck was only cut and they intake side of the head was not ?
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Re: would you brake in a engine with a new six pack?
[Re: JohnRR]
#1119153
11/22/11 03:00 PM
11/22/11 03:00 PM
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Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
OP
mopar
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OP
mopar
Joined: Jan 2006
Posts: 587
IL . usa
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I was figuring in the .o12" off the block that gave me .072 total off the deck and heads.Multiply that by .012 = .o86" needs to come off the intake .
But is that going to work with just a vally pan gasket?
I did this on a 383 and used the felpro intake gaskets on both sides and the vally pan gasket . we wacked the intake .090 " not sure if i should of .Still don't think it is right because the intake might of went on with just the tin pan. At the time i was new to mopar engines and thought i had to use the paper gaskets because they came with the intake set .
Is there way to get an impression of where the intake sitts with grease and paper or cardboard ?
1969 Dodge Charger
1969 Dodge Superbee
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Re: would you brake in a engine with a new six pack?
[Re: Challenger 1]
#1119155
11/22/11 03:39 PM
11/22/11 03:39 PM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
Also use old headers to break in your new motor.
O come on There is nothing like watching a brand new set of headers turn cherry red especialy when they are coated. 
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Re: would you brake in a engine with a new six pack?
[Re: cjs69mope]
#1119157
11/22/11 03:40 PM
11/22/11 03:40 PM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
I was figuring in the .o12" off the block that gave me .072 total off the deck and heads.Multiply that by .012 = .o86" needs to come off the intake .
But is that going to work with just a vally pan gasket?
I did this on a 383 and used the felpro intake gaskets on both sides and the vally pan gasket . we wacked the intake .090 " not sure if i should of .Still don't think it is right because the intake might of went on with just the tin pan. At the time i was new to mopar engines and thought i had to use the paper gaskets because they came with the intake set .
Is there way to get an impression of where the intake sitts with grease and paper or cardboard ?
I didn't do the math to check you. As far as the valley pan , if you want it to sit right you have to cut the valley end rails also though some people just force it into place. The same ratio is used on the end rails , .012 for every .010 off the block so at minimum the end rails should have .0144 , you need to decide about the heads cut amount if you want to do that.
I like to use the paper gaskets , helps insulate the intake from the rest of the engine heat wise and helps to seal the intake.
realize if you don't cut the heads and instead cut the intake that it is forever married to that block head combination. it may or may not , may not is more likely, fit on any other engine.
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Re: would you brake in a engine with a new six pack?
[Re: 540challenger]
#1119158
11/22/11 03:42 PM
11/22/11 03:42 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Also use old headers to break in your new motor.
O come on There is nothing like watching a brand new set of headers turn cherry red especialy when they are coated.
Yup that happened to me with my new 6 pak motor running during break in.  Then I read TTI instructions to use old headers for break in. Damn why didn't I read them first? 
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Re: would you brake in a engine with a new six pack?
[Re: Challenger 1]
#1119159
11/22/11 03:45 PM
11/22/11 03:45 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Quote:
Also use old headers to break in your new motor.
O come on There is nothing like watching a brand new set of headers turn cherry red especialy when they are coated.
Yup that happened to me with my new 6 pak motor running during break in. Then I read TTI instructions to use old headers foor break in. Damn why didn't I read them first?
broke my 440-6 in w/ my el-cheapo headers that I stripped and used VHT paint on and they still look great.
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Re: would you brake in a engine with a new six pack?
[Re: JohnRR]
#1119160
11/22/11 03:45 PM
11/22/11 03:45 PM
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Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
OP
mopar
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OP
mopar
Joined: Jan 2006
Posts: 587
IL . usa
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To me cutting the intake is an easy thing especially when the heads are already done .
I am fine with the intake being married to this motor that is why i want to only cut one intake and not two .
thank you your you answers i appreciate your experiance .
Cj.
1969 Dodge Charger
1969 Dodge Superbee
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Re: would you brake in a engine with a new six pack?
[Re: cjs69mope]
#1119161
11/22/11 03:50 PM
11/22/11 03:50 PM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
To me cutting the intake is an easy thing especially when the heads are already done .
I am fine with the intake being married to this motor that is why i want to only cut one intake and not two .
thank you your you answers i appreciate your experiance .
Cj.
So I guess that means that the intake side of the heads were not cut originally ? If not then cut the manifold, if you feel that getting it running on break in with the 6pk is not above your skill level then go for it .
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Re: would you brake in a engine with a new six pack?
[Re: gtx6970]
#1119164
11/22/11 06:10 PM
11/22/11 06:10 PM
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Joined: Jan 2003
Posts: 1,177
People's Republic of Kali
70runner
super stock
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super stock
Joined: Jan 2003
Posts: 1,177
People's Republic of Kali
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I just broke-in my 440-6 on a test stand using new, but 10yr old repro carbs out of the box. Stealth heads, lunati 60303, stock manifolds, TTI 2.5. Only change to the carbs was #65 jets instead of #61 stock. Youtube videoHowever, intake leak gradually degraded idle quality. Used paper gaskets on valley pan, but didn't seal paper to head/intake surface. Used permatex black to seal second time around. Running good. Just installed engine in 70RR couple days ago.
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Re: would you brake in a engine with a new six pack?
[Re: Mr.Yuck]
#1119165
11/23/11 12:28 AM
11/23/11 12:28 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
what's the problem? Why would it be a bad idea? Just make sure your floats are set (have to do that w/ a 4bbl), then make sure your distrib is clocked right, fill the primary bowl up, turn the mixture screws in all the way then out 1.25 turns, turn the idle screw down (so the engine mantains about 2k) and let her rip. Once it's warm turn the idle up to 22-2400 set your timing in full around 36* (vac advance pluged) get your vacuum gauage out and tune for best signal. Once the 20 minutes are up, change the oil and go for a drive. You can leave the outboards un-hooked if you like, but they aren't going to open until your engine goes under "load"
As for cutting the block or heads, sure but make sure the intake will seal before you fire it. If you cut the heads a bunch you'll have to have the intake cut too. I had to have .030 taken off a brand new RPM once.
I agree as I start new engines with new DP carbs all the time. Just make sure everyting is set right as you would do on a new eng anyway. Ron
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