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  #91 (permalink)  
Old 12-15-2012, 07:16 PM
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406 Engine Build...What do you think?

Just remember that your static compression isn't that bad. You will have to run a large duration cam with some overlap. If you don't have the money to spend on a mechanical roller cam get a solid flat tappet like this Crower 00321. Chevrolet Mechanical Flat Tappet Camshaft - Camshafts. This will bring your DCR down to around 8.2 where you can run pump gas. Might even get away with 89 octane. Next time you purchase a kit don't trust the numbers in the ad they are trying to make a sale. Find a online calculator and find your static compression and dynamic compression ratio and then make a decision. It is always best to run a 9.5 static compression ratio with the gas sold today. That way it won't be a problem choosing a camshaft. BTW don't forget to use .027 thickness head gaskets not .039. Keep the quench as tight as possible.

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  #92 (permalink)  
Old 12-15-2012, 10:39 PM
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Last edited by cobalt327; 12-15-2012 at 10:48 PM. Reason: wrong thread
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  #93 (permalink)  
Old 12-16-2012, 04:46 AM
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Old 12-16-2012, 10:50 AM
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Thanks for being a ******
"You should never argue with an idiot! Observers may not be able to tell the difference!" - Unknown

I can not believe that you guys are still subscribing to this thread!!

Even MORE AMAZING - I can not believe that I am still subscribing to it!!

I will have to admit that it was fun for a while. But not anymore!!

GOOD LUCK with whatever you decide what to do with whatever you have whenever you decide to do it wherever you decide.

"HASTA LA VISTA BABY!!" - Arnold

Tom
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Old 12-16-2012, 11:27 AM
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Originally Posted by texastomeh View Post
"You should never argue with an idiot! Observers may not be able to tell the difference!" - Unknown

I can not believe that you guys are still subscribing to this thread!!

Even MORE AMAZING - I can not believe that I am still subscribing to it!!

I will have to admit that it was fun for a while. But not anymore!!

GOOD LUCK with whatever you decide what to do with whatever you have whenever you decide to do it wherever you decide.

"HASTA LA VISTA BABY!!" - Arnold

Tom
Keep using the Internet to get your calculations...the threads over anyways...and I don't need luck with my engine combination
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  #96 (permalink)  
Old 12-17-2012, 09:30 AM
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I'm with Mr. Minter, I don't see a 14cc dish piston for the 400 block from Probe. If you have such a piston on hand and intend to use them with 64cc chambers, the SCR will be on the order of 10.6:1.

With a 6" rod, the wrist pin will be pushed up into the oil ring, something that I will not build. You won't see a nickel's difference in performance between a 5.7" rod and a 6" rod and you don't have to crutch the ring land to prevent snagging.
I just checked out my pistons and their design doesn't put the wrist pin in the oil ring grove just for future reference...thanks for your knowledge...I sincerely mean that
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Old 12-17-2012, 11:03 AM
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I ran some #'s with my Engine Analyzer and it shows spark knock at over 20* vac advance. At 3000 RPM, it was showing 1.1 and the program says anything between 1.0 and 2.0 is a "grey" area and the program is not sure if knock will occur.

But.... for some reason that's with the dyno program coming up with 8.3 dynamic. If its at 9.1 as United's site comes up with, you'll be knockin around for sure.

BTW, TQ was at 430ish, and HP was at 368. I was at home doing it and can't remember exactly.
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Old 12-17-2012, 11:25 AM
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what are correct numbers? If I posted my parts list I bet 97% would tell me how wrong mine are???
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Old 12-17-2012, 11:52 AM
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what are correct numbers? If I posted my parts list I bet 97% would tell me how wrong mine are???
My engine should be done Thursday and I hope to install it right after that and can let u guys know if there is signs of detonation...my machinists says there won't be detonation lol
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Old 12-17-2012, 12:00 PM
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Originally Posted by 123pugsy View Post
I ran some #'s with my Engine Analyzer and it shows spark knock at over 20* vac advance. At 3000 RPM, it was showing 1.1 and the program says anything between 1.0 and 2.0 is a "grey" area and the program is not sure if knock will occur.

But.... for some reason that's with the dyno program coming up with 8.3 dynamic. If its at 9.1 as United's site comes up with, you'll be knockin around for sure.

BTW, TQ was at 430ish, and HP was at 368. I was at home doing it and can't remember exactly.
Thanks! But check out the torque numbers of blueprints crate 383 with the aluminum heads (same as mine) and look at their cam and tell me what you think? Part #BP3834CT1

Last edited by lhmurphy; 12-17-2012 at 12:12 PM.
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Old 12-29-2012, 10:49 AM
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I just finished a 406 in Oct and had it dynoed on an engine dyno. Below are the parts used compression specs.

1978 400 509 block .030 over (406 ci)
Eagle crank 3.750
Scat 5.70 Rods
Probe 22.5 dish pistons (9.6 SCR, 8.3 DCR)
Howards HR Cam, .233/.241 at .050, .530/545 lift, 110 degree LSA
Fel-Pro .041 head gaskets
Trick Flow 23 degree heads, 195 cc runners, 64 cc chambers
Weiand Air Strick intake
Holley 770 Street Avenger
GMPP HEI ignition

Engine dynoed at 474 hp at 5700 rpm and 509 Torque at 4400 rpm

Very streetable engine on pump gas and should have no detination
problems. I'm using 91 octane right now but will try the 87 octane
when spring gets here. Only drawback of the build is the tires seem to
wear must faster.
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The Following 2 Users Say Thank You to panhandle For This Useful Post:
techinspector1 (12-29-2012), vinniekq2 (12-29-2012)
  #102 (permalink)  
Old 12-29-2012, 07:32 PM
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The bigger 770 carb was a good choice.Your original 670 would not have been as successful. you could make over 500 now
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  #103 (permalink)  
Old 12-29-2012, 07:48 PM
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Originally Posted by vinniekq2 View Post
If I posted my parts list I bet 97% would tell me how wrong mine are???
Yeah, but we'd let you slide because you're a nice guy.
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Old 12-29-2012, 07:51 PM
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Quote:
Originally Posted by panhandle View Post
I just finished a 406 in Oct and had it dynoed on an engine dyno. Below are the parts used compression specs.

1978 400 509 block .030 over (406 ci)
Eagle crank 3.750
Scat 5.70 Rods
Probe 22.5 dish pistons (9.6 SCR, 8.3 DCR)
Howards HR Cam, .233/.241 at .050, .530/545 lift, 110 degree LSA
Fel-Pro .041 head gaskets
Trick Flow 23 degree heads, 195 cc runners, 64 cc chambers
Weiand Air Strick intake
Holley 770 Street Avenger
GMPP HEI ignition

Engine dynoed at 474 hp at 5700 rpm and 509 Torque at 4400 rpm

Very streetable engine on pump gas and should have no detination
problems. I'm using 91 octane right now but will try the 87 octane
when spring gets here. Only drawback of the build is the tires seem to
wear must faster.
Excellent combination. Thanks for posting it.
I'd bet a nickel it'll run detonation-free on 87.
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  #105 (permalink)  
Old 12-29-2012, 08:06 PM
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Panhandle,I agree with Tech (not that Im a nice guy)
That is a nice engine,,,I thought you were the O.P. and had used a bigger carb and slightly bigger cam....
is it possible to post the dyno graph? I would like to see the SFC and A/F ratios.

set your red line at 6k and help out the good people at good year
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