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  #16 (permalink)  
Old 12-27-2012, 10:58 PM
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its a 496 a 454 .030 over .250 over stroke i have 113 cc aluminum heads not in picture 9-5 compression acomp 288 cam roller rockers comp roller chain pushrods 100 longer and 3- 500 cfm holleys sanderson headers 400 turbo 331 gears ,just a good ole farm truck

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  #17 (permalink)  
Old 12-28-2012, 06:11 PM
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Yeah, the headers were on the truck when I bought it, but If i ever change them out I'll keep these suggestions in mind. Do different tube diameters on long tube headers make big differences in the sound of the truck?

Do you guys think I would gain much on the street by going up to a 750 carb?
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  #18 (permalink)  
Old 01-02-2013, 08:26 PM
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I've been thinking about getting a Holley 750 carb, does anyone know if that will bolt up to my Edelbrock performer rpm intake? Or would I have to run an adapter plate?
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Old 01-02-2013, 08:36 PM
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750 is a good choice and should fit
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Old 01-02-2013, 08:38 PM
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Maybe you guys can help me figure this out... It seems like my truck should have a bit more power when I just punch it to the floor from a dead stop. So, I was hoping maybe a little bigger carb would help that?

I was thinking maybe when I floor it and those rpms go up, it's just not getting enough gas.
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  #21 (permalink)  
Old 01-02-2013, 08:39 PM
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Originally Posted by vinniekq2 View Post
750 is a good choice and should fit
Alright thanks.
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  #22 (permalink)  
Old 01-02-2013, 09:22 PM
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Quote:
Originally Posted by fastnloud View Post
Maybe you guys can help me figure this out... It seems like my truck should have a bit more power when I just punch it to the floor from a dead stop. So, I was hoping maybe a little bigger carb would help that? I was thinking maybe when I floor it and those rpms go up, it's just not getting enough gas.
Am I correct in assuming that the motor doesn't have enough poop to spool the converter up and get up on the cam? What does your ignition timing look like. How much initial at the crank? How much in the weights? What rpm at full advance?
Suggest 20 degrees advance at the crank, 16 in the weights, all in by 2800.

I tried to find something wrong with the SCR/cam/DCR, but everything looks good as far as matching up. I see 10.2:1 SCR, DCR should be right at 8.3:1 with the intake valve closing at 47 degrees ABDC @0.050" tappet lift.
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Old 01-02-2013, 09:28 PM
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Originally Posted by techinspector1 View Post
Am I correct in assuming that the motor doesn't have enough poop to spool the converter up and get up on the cam? What does your ignition timing look like. How much initial at the crank? How much in the weights? What rpm at full advance?
Suggest 20 degrees advance at the crank, 16 in the weights, all in by 2800.

I tried to find something wrong with the SCR/cam/DCR, but everything looks good as far as matching up. I see 10.2:1 SCR, DCR should be right at 8.3:1 with the intake valve closing at 47 degrees ABDC @0.050" tappet lift.
Thanks for the help

What you described sounds right to me. I'm not sure about the ignition timing, but I can talk to the guy that does my motor work, and ask him about it.
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  #24 (permalink)  
Old 01-02-2013, 09:36 PM
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Quote:
Originally Posted by fastnloud View Post
Thanks for the help
What you described sounds right to me. I'm not sure about the ignition timing, but I can talk to the guy that does my motor work, and ask him about it.
That is a very large cam and it will require a very large amount of ignition advance to operate properly. I suspect the motor will wake up when you get the advance in it.
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  #25 (permalink)  
Old 01-02-2013, 10:20 PM
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Quote:
Originally Posted by fastnloud View Post
I have an 82 GMC Sierra with a built 350 and 350 turbo trans. Street driven.

Here are the specs on my motor:

350 4 Bolt Main .040 Over
Scat forged I beam rods
Keith Black flat top pistons 4v reliefs
Moly rings
World Sportsman II heads 2.02 valves and 64cc chambers
Edelbrock performer rpm intake
Edelbrock 650 carb
1 7/8 longtube headers
Lunati Bracket Master II Cam 300 duration
Crane Valve springs
Crane roller rockers
Comp Cams double roller timing set


Trans:
350 turbo
b&m rebuild kit
stage 2 shift kit
Hughes Performance 3000 stall

I haven't dynoed it, but the truck runs very well!

My questions are... what would I need to add/change out to make my motor a 383 stroker? How much more horsepower would I be looking at?

Also, would a tunnel ram intake make very much more horsepower or torque?

Thanks guys.
Stay away from the tunnel ram. It will only hurt you for low end torque.
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  #26 (permalink)  
Old 01-02-2013, 11:10 PM
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For what its worth, I have the same heads (Sportsman ll's) advertised at 64cc. I cc'd mine and they bang on 61cc's with valves in, no plugs.

Duke
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  #27 (permalink)  
Old 01-26-2013, 07:18 PM
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Bumping this thread up, I've been looking around at some used carbs because I'm wanting to get a 750.

I've found a Jegs 750 carb locally, that I might can get a good deal on.

Does anyone know which company actually makes the Jegs carbs?
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  #28 (permalink)  
Old 01-27-2013, 02:12 PM
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less duration on the cam would help you have to have a tighter lobe seperation in order to make the most power and step up on the carb a little and for the cam i would run around a 274 duration for the build you have going and about a 2500 stall to get the truck going
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  #29 (permalink)  
Old 01-27-2013, 02:17 PM
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sounds like not enough compression for that cam
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  #30 (permalink)  
Old 01-27-2013, 02:25 PM
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camaro 355,using less duration does not have anything to do with the lobe separation angle.
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