The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)

- - spark plugs question. confused (https://67-72chevytrucks.com/vboard/showthread.php?t=474162)

samikit

07-11-2011 07:39 PM

spark plugs question. confused

I have a 82 silverado with a 350. Has 492 heads and 9.5-1 compression. I swapped plugs. Went from r45ts to r43ts because of advice from a mechanic. Problem is now my idle rpms are lower and there is power loss. Do you have to advance timing with a cooler plug? Should I switch back to the hotter plug? Thanks in advance.
Posted via Mobile Device

gchemist

07-11-2011 08:31 PM

Re: spark plugs question. confused

More compression = LESS gap. Less gap is needed to overcome higher compression pressure resistance. Have you tried using a different gap? What type of ignition do you have on it?

samikit

07-11-2011 10:40 PM

Re: spark plugs question. confused

Hei distributor. Gap is .35. Guess I should have set it at .45?
Posted via Mobile Device

All times are GMT -4. The time now is 05:56 AM.