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1970 Other Ford Models Torque Question?

Tiny
RANCHERO DAVE
  • MEMBER
  • 1970 FORD
Other Category problem
1970 Other Ford Models V8

I have a question about improving the torque on a 70 Ranchero. The engine is currently a 351C with the 4v heads and a 650 carb. This truck is owned by a good friend of mine and he tows a 2000lb bass boat and is looking to get a little more torque. He has stock exhaust manifolds and 2 1/2" exhaust with flowmasters. He is running a FMX automatic.

Now I told him if he wanted to increase lower end torque and increase fuel mileage he should install a 570 Holley street Avenger carb. Due to the smaller primaries he woul see a crisper throttle and better fuel mixture at a lower rpm.

So, am I right about this theory or am I way out in left field on this one?
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Tuesday, February 5th, 2008 AT 9:15 PM

2 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
You are right about the lower end torque but he will comprimise the high end torque. If he wants low end torque he can get new headers, 4-2-1 flow master headers with 3 inch exhaust, or you can use the 2 1/2 inch. Or simply install a manual tranny or change to a 6 speed tranny. With extra low gearing.

Also if he got his engine rebored it would help dramatically low and high end torque.
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Tuesday, February 5th, 2008 AT 9:40 PM
Tiny
MOFO67
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I would go to longer and earlier duration cam first just don't go wild on lift and your idle will stay mild and you gain torque and horse

just my idea
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Saturday, July 18th, 2015 AT 6:40 PM

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