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Old 06-02-2008, 05:44 PM
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rebuilt chevy 350 help

I have a 350 chevy that I did a top end job on. Its a 1976 4bolt, stock pistons and crank (in excellant shape). I put in my 66 chevelle and have been working on it, but it runs like crap when I push it (bogs when I hit the gas hard and after it finally picks up, it loses its pull at higher rpms). I am getting nowhere near the performance I should be getting.

Heres whats in it:

- completely rebuilt heads - 60cc, 2.02 intake, 1.60 exhaust
- comp cam xtreme energy 274 cam, .490 lift intake and exhaust, tappet lift 274
-edelbrock performer manifold
-edelbrock 750 cfm 4 barrel carb
-on the rebuild, new, high performance oil pump, fuel pump (mech), water pump, radiator, gaskets,seals etc.
-rebuilt saginaw 4 speed trans
-new points distributor, and high energy coil.

dwell is set at 30 degrees and timing is set at 4 degrees BTDC

Despite all this - it runs like crap - help !!

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Old 06-02-2008, 05:55 PM
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Quote:
Originally Posted by jjpodlas
I have a 350 chevy that I did a top end job on. Its a 1976 4bolt, stock pistons and crank (in excellant shape). I put in my 66 chevelle and have been working on it, but it runs like crap when I push it (bogs when I hit the gas hard and after it finally picks up, it loses its pull at higher rpms). I am getting nowhere near the performance I should be getting.

Heres whats in it:

- completely rebuilt heads - 60cc, 2.02 intake, 1.60 exhaust
- comp cam xtreme energy 274 cam, .490 lift intake and exhaust, tappet lift 274
-edelbrock performer manifold
-edelbrock 750 cfm 4 barrel carb
-on the rebuild, new, high performance oil pump, fuel pump (mech), water pump, radiator, gaskets,seals etc.
-rebuilt saginaw 4 speed trans
-new points distributor, and high energy coil.

dwell is set at 30 degrees and timing is set at 4 degrees BTDC

Despite all this - it runs like crap - help !!
Which heads casting number unless you for sure know the chamber CCs, then Ican work from CCs. Also needed is the piston your using. Piston releifs are used to contol compression so I need this to see where your compression is. Piston to deck clearance and gasket P/N or thickness would also be good info.

You're packin a lot of cam so getting this straightened out with compresson, timing, etc is doing to take some efforts to get it all meshed.

Bogie
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Old 06-02-2008, 06:28 PM
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The timing is set way too lazy for that set up. Just for kicks, disconnect and plug the vacuum line to the distributor. Set the initial to 15 advanced (at idle) and rev it to 2500 rpms. If the total timing isn't in the low to mid-thirties, remove the mechanical advance limiting bushing and see how far it totals out at. If it's around 34-36, good. If it's not, reset the initial until the total is 34-36 and reset your idle speed to where you want it.

tom
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Old 06-02-2008, 06:37 PM
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Tom is on the right track, but I have to say this as I have said it 100 times before,, Why are you running points? the best place for points is the trash.
Install a HEI, no dwell, no points to set, far more fire power, and simple to maintain.
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Old 06-02-2008, 06:46 PM
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Originally Posted by DoubleVision
Tom is on the right track, but I have to say this as I have said it 100 times before,, Why are you running points? the best place for points is the trash.
Install a HEI, no dwell, no points to set, far more fire power, and simple to maintain.
I'd argue that. I changed from points and an Accel Super Coil to a Pertronix with an MSD Blaster Coil and saw little, if any, improvement. An MSD-5 and MSD-6 didn't help either.

Spent a lot of money for nothing.

tom
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Old 06-02-2008, 08:02 PM
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I also have a 76 350 but a 2 bolt, balanced crank tho and 30 over. stock heads and one of them crane cams fireball2 cams in it(forgot the numbers on it)
with a twinpump holley 700, and HEI set up. I run 10degsBTDC and it runs pretty decent, in a 66chevelle as well.

are ya getting sings out the tail pipes? dark smoke no smoke? what do the plug tips look like?

I agree 4 degs is a wee bit too lazy
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