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  #16  
Old 02-17-2017, 06:50 AM
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Blueprints motors are rebuilt , I looked at them before deciding on the GM 350/290 crate motor . I kept my stock Carb and computer .I just installed Pypes sgg53s exhaust . its a cat back dual 2.5 stainless steel with street pro mufflers .
here's video of idle ,
https://youtu.be/mNgEJS1DS0s
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  #17  
Old 02-17-2017, 07:00 AM
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Quote:
Originally Posted by JJLT1 View Post
the GM motors are bran-new,, the Blueprint are probly all rebuilt..
They advertise the 400 SBC as all new castings / Forged internals....I think they just introduced it last year.
http://blueprintengines.com/index.ph...ng/gm-400-main

SERIOUSLY thinking about one of them for the '68 Camaro. I had a 400 in a '79 Z28 and it ran respectably......right up until the head gasket let go.
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1968 Camaro RS (our car)
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  #18  
Old 02-17-2017, 07:04 AM
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Quote:
Originally Posted by jpmdaddy View Post
Save your 305 tuning money and buy a new 350 crate motor, they start at about $1600 and lately both SummitRacing and JEGS have had free shipping
X2, don't waste your time and money on the 305. Even a mildly built 350 doesn't gain much Hp with headers and most people make the mistake of going to big of exhaust which will actually hurt the performance. If you do go headers, if your under 400hp use smaller primary tube diameters like 1/2-5/8 the 1/2 will feel a little more torque'er or just stick with stock cast manifold, and a 2.25 exhaust would be more than fine. Add a H pipe for added torque or an X pipe for added hp.
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  #19  
Old 02-17-2017, 08:42 AM
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Quote:
Originally Posted by JJLT1 View Post
David are you going to keep the computer??

the GM motors are bran-new,, the Blueprint are probly all rebuilt..
I just had a sit-down with my mechanic to start talking this through, he mentioned that if I keep the computer, it is tied to the Rochester Quadrajet on those years, giving the carb information for metering. What we're not sure of is what happens if that's the only connection that isn't hooked back up? Or, can the computer be re-flashed with new information, or new PROM I guess?

My thought would be that my quadrajet wouldn't be properly jetted for the larger displacement, or the greater airflow I would expect. So, I might opt to go back with a different carb anyway, but the same question applies, does that affect the computer if it cannot provide info to the carb?

Confirmed that for state inspection here, while they do not test emissions for something this old, they are supposed to look for the smog equipment and cats. So, there is something smog related sampling exhaust at the manifolds now, how does that translate to headers I wonder?

Lots of questions... it seems like it should be simpler...
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  #20  
Old 02-17-2017, 09:03 AM
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I'm sure you'll get the answers you need when people that have done this see this post, be sure to search this forum for the answers also.

Last edited by JKCamino; 02-17-2017 at 11:59 AM.
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  #21  
Old 02-17-2017, 11:04 AM
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To delete the CC carb, you will also need to replace the CC distributor....and if I'm not mistaken, you will need a new coil / ignition system. You can do a search in these forums and find a lot of these answers (top center of the page under the NECOA banner)......Also g-body forums / g-body central / malibu racing / g-body.org are somewhat helpful.

You can buy headers that have SMOG pump ports in them.....I've seen them but I cannot remember where. But I did find this with a quick internet search. http://www.hedman.com/Hedman-Smog-Pump-Kits
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  #22  
Old 02-17-2017, 11:36 AM
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I had issues getting my 350/290 to idle correctly . It only makes 16HG of vacuum when the stock 305 makes 25-28 HG . This was throwing the MAP sensor out of whack and sending the wrong signal to the computer leaning out the mixture via the mixture control solenoid . My final fix was moving the MAP sensor Vacuum hose to the Intake (larger diameter hose ) and adjusting my idle mixture screws out as much as possible . I am in California so I am stuck with the Smog stuff . I read up recently about drilling out the Idle mixture holes a little . I have an extra carb so I might try that as my idle RPMs are still a little low .
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  #23  
Old 02-17-2017, 02:51 PM
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JJLT1, I've also noticed that cross members which fit 200R4 are a bit more expensive than those for 700R4's.

David, I have gone back and forth about whether to buy a crate vs doing the rebuild myself, mainly because I enjoy putting things together. If you have a good core and crank, any reputable machine shop will do the necessary work and place you on the right track. However, due to economy of scale in purchasing parts, these online sources are very tempting. Rather than rebuilding the 305, I would go with the 350. These blocks are so commonplace and available.

Several years ago, I found a deal for $350. It was a 4-bolt 350 motor with a blown head gasket and owner wanted to get rid of it. He had bought the early model pickup from the truck builder and wasn't familiar with the internals. Once I took it apart, I uncovered a forged, balanced crank with Eagle rods and SRP pistons (which were toasted due to detonation), Crower Solid lifter cam, dual roller timing chain, etc.

So, there are nuggets waiting to be found.
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  #24  
Old 02-17-2017, 10:37 PM
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thanks Kyle
it seems Blueprint has there own cylinder blocks for sale now, 4" and 4.125" bore SBC..

the CCC electric Qjet is the only one that will work with the stock computer setup,
it has the Mixture Control Solenoid and Throttle Position Sensor..
you have to have the correct distributor, and all the sensors MCS,TPS,MAP,O2,ESC,EGR,....
or the whole thing goes into limp mode, the chip/prom can be changed for adjustments
but not for deleting the right carb..
if the mechanic doesn't know this?? he might not be the right one?? does he have the tools/knowledge??

the carb does not really care how big the motor is,
a normal carb just adds a metered amount of fuel to the air flow it see's,
the CCCcarb/computer adjusts that mixture all the time, based on feed back from the carb/sensors
but it may run out of room to adjust the mixture with out carb and computer tuning..
it takes some special tools/knowledge to adjust the carb, and tune the computer, burn or buy chips..

the new 1600$ GM 350 crate motor is just that, its the cheapest new motor youll find anywhere..
its not the best motor for anything, except the wallet and warranty..
the 2000$ L-31/R is a much better stockish hp motor for the money..
but it takes some changes to make it work..

do some searches/readin, ask some more questions..
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  #25  
Old 02-17-2017, 10:44 PM
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Quote:
JJLT1, I've also noticed that cross members which fit 200R4 are a bit more expensive than those for 700R4's.
I think there all about the same price in those links, the expensive ones at Jegs are kits with mounts,
and I think? the ?84?? and older Elkys need the frame extension for the rearward trans mount location
like the 2004r and th400..

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  #26  
Old 02-18-2017, 05:25 AM
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I'd put a stock low compression 454 in there with a TH-400 and a 2 series rear end.. That car would be a blast and on 87 octane..
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  #27  
Old 02-18-2017, 06:11 PM
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This 383 roller cam from Blueprint is tempting me... but if I don't want to get into upgrading the rear end and trans, I'm guessing a 350 is more than enough, certainly better than a tired 305 as it is now, and better than rebuilding it.

http://www.blueprintengines.com/inde...ed-bp38313ctc1
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  #28  
Old 02-18-2017, 07:25 PM
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that would be like 3- 305's.. I don't think the computer will like it tho..
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