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Old 11-02-18, 01:43PM   #76
Gach
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Yup 4:10 gear
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Old 11-04-18, 06:07AM   #77
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So it's either out of steam on the 2-3 or floating the valve(s) would be my guess - not sure why he's never put it on a dyno to work it out... dyno shops operate in the off season over there??

I had the exact same problem with my 400, would just lay over on the 2-3 and it turned out to be valve springs because of the heavy valve train. Tried slightly heavier springs and the hyd lifters would collapse so ended up going mild solid roller, bam the little 400 went 118mph at 3950lbs on the line with 3.89 gears, 28" tyre. Needs more gear to get my heavy tank moving now and the 4L80e to keep it reasonably efficient, street car...
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Old 11-04-18, 10:07AM   #78
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Just my opinion, , motor has never been torn down in 8 yrs. As soon as time allows me i am going to start with a compression test on all the cylinders, then do a leak down test. I am starting a new stroker motor witch is taking alot of time and all my cash on hand right now. Searching for a good leak down testers and see alot of junk on the market right now. Gach worked with me on a daul valve spring set-up for this motor so i can honestly say at 130si closed i am ok there. Out of steam probably, all depends what tests reveil. stay tuned. Ill let you know what i find. I did post a compression test i did beginning of the yr. but things change im sure.
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Old 11-04-18, 11:10AM   #79
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" Gach worked with me on a dual valve spring set-up for this motor so i can honestly say at 130si closed i am ok there."

Were the springs tested at the actual verified installed height ? Never trust what the spring charts say, they can very from run to run. I received new springs out of the box that when measured they were 10-15 pounds different than the listed specs.


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Old 11-04-18, 11:58AM   #80
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Steve if I remember correctly the springs were to be shipped to Lou for him to test the pressure closed & open then shipped to rich. Did this happen I don’t know but that maybe what rich is saying. I’m more interested in this stroker motor. What stroker size (crank size) who’s building it
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Old 11-04-18, 12:06PM   #81
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All fine and dandy presuming Lou tested them at the actual verified installed height on the cylinder heads in use. Not a guess. .
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Old 11-04-18, 04:38PM   #82
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I sent back his check, because the original ones I was getting wouldnt work out. I gave him the part number to get, he ordered them, Im sure he checked them all before he installed them.

I agree with Rich, hes been racing that motor for 8 years, a compression check ( or leak down test ) will tell the story. Might just be time for a freshing up. From what he tells me, hes moving on, and retiring the 400.

He has a .060 400 block, hes putting a 4.2100 stroke crank in it, the Crank has 3 mains. With Some good steel rods.

Standard bore 400 is what 4.120 bore, so .060 over makes it 4.180 bore with 4.210 stroke = 462.18 ci if my calculations are right. Then put his E-heads on it

That should get him in the solid 11.60s.
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Old 11-04-18, 04:47PM   #83
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Some advice, its a used .060 over 400 block. Two things I would do first Id have those cylinders walls sonic tested. To make sure you have enough wall thickness on the thrust side, very important. .060 blocks tend to be thin. Second Id check those cylinder walls #3 Id check the line bore.
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Old 11-04-18, 04:56PM   #84
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"...hes putting a 4.2100 stroke crank in it, the Crank has 3 mains"

Is this a factory crank that was turned down and thrust welded ?
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Old 11-04-18, 04:59PM   #85
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Quote:
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"...hes putting a 4.2100 stroke crank in it, the Crank has 3 mains"

Is this a factory crank that was turned down and thrust welded ?
Yes it is crankshaft specialists did the crank.
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Old 11-04-18, 05:10PM   #86
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GOOD LUCK ! Very old out of date with all the aftermarket cranks today.

I did that modification to a 455 crank by a well know shop 20 years ago before we had all these cranks to choose from today. It lasted thru the one engine combo and wiped out my original numbers matching 400 block.

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Old 11-04-18, 05:33PM   #87
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I bracket race a crankshaft specialists crank for years over 300 runs at 625-650 hp never had a issue.

The one he has is a fresh Crank never been dragged race. Its one I had done by them, when I went to the IA11 block I decided to go with a billet crank.

Maxey and Nunz used their cranks for years.

With the cam hes running its going to lower his shift point to 5500.
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Old 11-04-18, 05:56PM   #88
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I understand all that. Still ancient and honestly a long time since I've seen anyone doing so, again especially with the aftermarket cranks now. But to each his own.

Maxey and Nunzi = OLD dinosaurs



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Old 11-04-18, 06:05PM   #89
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Is this your crankshaft Lou ? You finally sold it.
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Old 11-04-18, 11:25PM   #90
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Quote:
Originally Posted by Steve C View Post
I understand all that. Still ancient and honestly a long time since I've seen anyone doing so, again especially with the aftermarket cranks now. But to each his own.

Maxey and Nunzi = OLD dinosaurs



.
Maxey is gone Nunzi up there. They were best of friends. Both had diverticulitis.

Oh both ran 8.50’s in 1995 with stock blocks stock cranks and Ram IV iron heads. Yep dinosaurs. I use to love talking Italian with the Nuz.
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