the block heater takes the place of your freeze plug, in this case you would need to locate and remove the correct freeze plug and replace it with the block heater plug, plug in the cord and route to appropriate location, done
Many different 300 -6 inline engines -state make and year.
351 isn't a big block. As for an answer to your question, depends on which inline six... tractor-trailer engines are inline six engines... If you're comparing the 300 Ford I6 to the Ford 351, the 351 has more power, hands down.
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To replace the circulating pump it will cost between $150 and $300 depending on the hot water heater. It will also cost you labor fees if you have someone install it for you.
Labor alone for a residential boiler would be around $800 while a water heater would be around $210-$300. These are typical rates for Connecticut anyway.
google gator belts or graber belts look at the catalog and surf it will show you under micro v belt install
The heater core is inside the HVAC housing, under the dash.
from the front of the engine they goe 1,2,3,4,5,6 and the firing order is 1,5,3,6,2,4
AUTOZONE.com then follow the links
It depends on the oil pan, but most of them take 5 quarts. My 1992 F-150 with a 4.9 liter (300 ci) inline 6 takes 6 quarts of oil with a filter change
1,5,3,6,2,4 I belive that's for any year of production.
The Ford 4.9 liter / 300 cubic inch six cylinder engine is an ( inline / straight six )