Just installed a 350 in my truck (59 GMC). vortec style heads and intake. edelbrock carb. Start up the truck runs, idles, and revs fine. Put it in drive and give it hard throttle or put it under a load, it sounds like a bunch of raddleing or a deisal truck going down the road. Any idea what it might be?

 

Sounds like detination. Try adding a little fuel and pulling a little timing. Your timing at idle may be good, but your advance may be too agressive. What compression are you running?

 

I think im running 9:1 or 10:1.

 

Thanks for all your help

 

I Had a 327 in a s10. it rattled some, It was the friggin harmonic balancer coming loose. Lunati made the crank snout a little too small..

 

well i had this motor in a s10 before and ran perfectly. I put new intake and carb on it and it does this. My dad think it could be coming from the transmission/transfercase. Im not sure Im so lost on it.

 

A new carb and intake means you pulled the distributer out and the new carbs air fuel may not be set right yet.

 

distributer MAY BE OFF A TOOTH ALSO

 

I set the timing today, it was way way advanced. i set it down to about 4 degrees adcvanced. Couldnt test though, now the rear end is making some noises so now i have to investigate it. LOL if its not one thing its another