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  #31 (permalink)  
Old 03-22-2014, 12:12 PM
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I just got an email back for the motowns they are sold! =[

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  #32 (permalink)  
Old 03-22-2014, 12:30 PM
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look at the video I posted,,,,
thats a serious engine with moderate cam timing and a dual plane intake,,,thats a brilliant street engine.
You are racing,,,,,if you use lesser parts your results will be less.
set your rev limiter to 6200 rpm.
or use a flat tappet cam and make a lot less power
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Old 03-22-2014, 01:10 PM
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How much power does a flat tappet rob over a roller roughly
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Old 03-22-2014, 01:33 PM
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actual hp through the rpm range is likely 20 horse pwer everywhere. Peak power will be a lot more on a real race engine compared to a street engine.On a 400 hp engine maybe 15-20- peak hp.
on an engine that has heads that flow a lot more at .600 lift compared to .500 lift,then take the flow figures into consideration

its all just math
If I took out my solid roller and put in a flat tappet hydraulic I would lose over 100 hp
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Old 03-23-2014, 01:16 PM
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Thanks to all you guys you are a knowledgeable bunch! I've learned more from discovering this form then I have in the past 10 years! and you will have to come check out some of the bogs in the north end of B.C vinnie!
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  #36 (permalink)  
Old 03-23-2014, 06:34 PM
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Thanks for the invite.I would travel up there to see a bog for sure.We can talk about lumberjack stuff too if you are a lumberjack,,,Im a climber.
keep me posted of events coming,in advance as much as possible,,,
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Old 03-26-2014, 09:46 AM
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Thats probably the only Sunfire Id ever own...

CNC porting has some limitations. Its not a magic bullet. For example, if your programmer has a bad day, you may have a run of 100 heads before the problem is remedied. Or, if the person attending the maching doesn't keep his tooling in good shape, the tool may travel in identical paths, but the results will be vastly different. Most common, is that the casting has some core shift, and the program hasn't been adjusted to compensate for it.

Its also interesting to note that a real head porter; a Tony Mamo, a Chad Speier or a Darrin Morgan; can usually find additional performance potential. Some of this is cleaning up the tool path marks, but a lot of it is the human interface; with years of experience, tailoring the port shape to the specific needs of your application. Having a CNC port on a good casting is a boon to a guy like those mentioned above; the CNC can get 95% "there" which means less time to fine tune each port , less fatigue on the porters eyes and hands, which means more overall consistency at a cheaper price for you, the consumer.

Peak numbers are not where its at, you want flow bench numbers at valve lift. This way a head specialist and a cam specialist like Mike Jones, Chris Straub, Harold Berkshire, etc can maximize your combination
Heres a link to some flow bench numbers from Speier VFactor SBC 23ยบ - The difference between good power and great power is what I call the "VFactor"
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Old 03-27-2014, 10:40 AM
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. Too bad you missed out on the MoTown 220 heads for $500... should have grabbed them the instant you saw them... sounds like simply putting them on your current 400 would have given you everything you are looking for in your desired WOT 5000-6000 RPM powerband for mudding... World sells mild 500+ HP crate engines with those heads in stock configuration... 600+ HP with MoTown 235's... Ignore what the others said about going with smaller heads, those are for lower RPM, wide RPM range street truck torque, which you're not interested in...

. Those TBI heads you're currently using have swirl ramps that partially block the intake ports... if they're still in there, could be why you're 400 is falling flat on its face by 5800... maybe cutting those ramps out would make you happy...

. I stumbled across a brand new pair of bare aluminum MoTown 220's at a swap meet for $500... I tried to act as calm, nonchalant, and uninterested as I could, while also buying them as fast as I could... for my SBC 400...! ... I went out and got my truck to pick up other big things I had bought, but first those heads went out with me in my hands...!!!

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Old 04-04-2014, 02:07 PM
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okay folks i've decided to go with the afr 220 eliminators 75 cc cumbustion chamber and as vinnie so wisely convinced me im going with a solid roller cam =] =] now i know these afr 220s will get me far past the 6000 rpm i wanted but my thinking is i will put these heads on the 400 already in my truck and build my other short block to exceed my previous goal of 500 hp and 6000 rpm and then i dont have to buy another set of bigger heads when im ready to drop it in (probably next year) now im setting my limiter at 6500 rpm this year and i picked up a 2800 stall converter what would be a good cam to go with? (keep in mind strickly racing this thing and idle or vacuum matters none to me)
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Old 04-04-2014, 02:59 PM
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. Probably about a 240/250 solid roller cam... LSA 110... the valve lash will knock it back to about a 235/245 which should be about perfect... enough mid RPM torque to get you under way and keep you going in the tough spots... enough HP to get you to 6,000+ RPMs and beyond...

. Don't know about the 76cc chambers... OK with flat top pistons... a little low on compression ratio with dished pistons for a decent cam... any idea what you have for pistons?
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Old 04-04-2014, 03:45 PM
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According to summits compression calculator I will have 9.93-1 should i be looking at more?

That was with a .030 head gasket i can use a .027 and get 10 -1

Last edited by lumberjack_43; 04-04-2014 at 03:56 PM.
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  #42 (permalink)  
Old 04-04-2014, 04:17 PM
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I run flattop pistons in pretty much all my 406's. With a bigger cam 240+ at .050, it brings down cranking compression, so you can get by with pump gas provided your running aluminum heads. Of course if you want to get the quench tight and you 0 deck the block, you may have to go 250+ at .050 to stay out of detonation as you will have 11.5+ compression. Compression makes power!
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Old 04-04-2014, 04:52 PM
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I'm not worried about gas lots to choose from aaround here
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Old 04-04-2014, 05:15 PM
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Then i would go with flatops for pumpgas, or if you can afford racegas, then go with domed high compression pistons!
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  #45 (permalink)  
Old 04-04-2014, 05:29 PM
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Quote:
Originally Posted by lumberjack_43 View Post
According to summits compression calculator I will have 9.93-1 should i be looking at more?

That was with a .030 head gasket i can use a .027 and get 10 -1
Sounds calculated right...but check head gasket available sizes first...there are a lot fewer thickness options for gaskets for the 400. I don't believe the re are .030" or .027" for the 400 unless you buy $$$ gaskets.

Why did you go with such big chambers if you have/are going to use race gas?? Compression is power.
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