3.91 rear axle with 225 Slant 6

From : budd cochran

Q: the slant six will always sound likes its screaming but its not. install a tachometer if it bothers you too much. at least youll know its not turning 200000 rpm at 60. vbg check your valve adjustments. factory specs call for hot engine warmed up settings of 0.010 for the intakes and 0.020 for the exhausts. i always liked 0.008 on the intakes and 0.010 on the exhausts. this will reduce engine noise and make it sound less like its gonna blow up. budd dodge tom wrote i have this in my newly purchased 1964 dodge d100 lb brought several days ago and drove on the highway on way home cruising at 55 mph the engine screams at high rpm. i tried 60mph the louder the engine revved. is this normal for this 225 slant six & 3 speed a745 gearbox running with a huge 8 3/4 axle housing the 3.91 gears .

Replies:

From : budd cochran

tom i ran both a 64 and a 65 engine at those settings for over a year each one ran about 8.5 years and a combined total of well over 200000 miles with no problems. overall performance improved they ran smoother started easier and got better economy a best of 41 mpg with water injection in a 65 valiant 2 door sedan. i think the settings work great but ymmv always applies. budd tbone wrote i would be careful with that exhaust valve setting. setting it too tight can burn them up. -- if at first you dont succeed youre not cut out for skydiving the slant six will always sound likes its screaming but its not. install a tachometer if it bothers you too much. at least youll know its not turning 200000 rpm at 60. vbg check your valve adjustments. factory specs call for hot engine warmed up settings of 0.010 for the intakes and 0.020 for the exhausts. i always liked 0.008 on the intakes and 0.010 on the exhausts. this will reduce engine noise and make it sound less like its gonna blow up. budd dodge tom wrote i have this in my newly purchased 1964 dodge d100 lb brought several days ago and drove on the highway on way home cruising at 55 mph the engine screams at high rpm. i tried 60mph the louder the engine revved. is this normal for this 225 slant six & 3 speed a745 gearbox running with a huge 8 3/4 axle housing the 3.91 gears .

From : tbone

i would be careful with that exhaust valve setting. setting it too tight can burn them up. -- if at first you dont succeed youre not cut out for skydiving the slant six will always sound likes its screaming but its not. install a tachometer if it bothers you too much. at least youll know its not turning 200000 rpm at 60. vbg check your valve adjustments. factory specs call for hot engine warmed up settings of 0.010 for the intakes and 0.020 for the exhausts. i always liked 0.008 on the intakes and 0.010 on the exhausts. this will reduce engine noise and make it sound less like its gonna blow up. budd dodge tom wrote i have this in my newly purchased 1964 dodge d100 lb brought several days ago and drove on the highway on way home cruising at 55 mph the engine screams at high rpm. i tried 60mph the louder the engine revved. is this normal for this 225 slant six & 3 speed a745 gearbox running with a huge 8 3/4 axle housing the 3.91 gears .

From : ol duffer

i have this in my newly purchased 1964 dodge d100 lb brought several days ago and drove on the highway on way home cruising at 55 mph the engine screams at high rpm. 1. not knowing what transmission you have make sure it is actually shifting into high gear. 2. its a truck. not much sound damping material. 3. often the fan makes more noise than anything else. its sized to provide adequate cooling at or near idle so at cruising speed where its hardly needed at all it blows hurricane force. upgrading to a clutch fan or electric can both reduce noise and improve power and economy. my old ford had 4.10 gears and was happy doing 65 all day. a few rpms really wont hurt the engine if its healthy and well maintained. .