400 ?

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Old

Jan 19, 2005 | 08:08 PM

#1

MichaelMuck

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400 ?

I have a ranchero that has a 71 400 in it. I also have a pair or aussie heads I going to put on it. compression would be about 10.5 to 1? what octane gas would I have to use

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Old

Jan 19, 2005 | 09:05 PM

#2

grclark351

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From: chicago burbs

i figure the CR will be closer to 11:1. premium if you're lucky, but i doubt it. you'll need a cam with a lot of overlap to keep cylinder pressure down, or use reverse dome pistons that come up to the top of the bore to take advantage of the quench chamber in the heads.

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Old

Jan 19, 2005 | 11:28 PM

#3

Torque1st

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Premium +octane boost, and lots of it. The 71 Motor had 9:1 compression. Leave it alone!

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Old

Jan 20, 2005 | 01:46 AM

#4

MichaelMuck

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I can get 100 oct gas for 2.00 per gallon (family), would that be hi enough?

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Old

Jan 20, 2005 | 09:07 AM

#5

74 F100 351m

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From: Okla.

I would say 130oct.

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Old

Jan 20, 2005 | 12:40 PM

#6

Torque1st

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The 71 400 was the best 400 ever produced, leave it stock. Upgrade it with a 4V manifold from Edelbrock or Weiand. Slap on a #1406 Edelbrock carb. Upgrade to DS-II Ignition. Run it!

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Old

Jan 20, 2005 | 07:51 PM

#7

MichaelMuck

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was the timimg retarded on this year motor?

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Old

Jan 20, 2005 | 10:58 PM

#8

Matts72

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From: Montana Territory

The 71 400 was the way they should have built them all, they had flat top pistons from the factory and straight up timing.

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Old

Jan 21, 2005 | 07:46 AM

#9

mark a.

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'71 400 pistons were dished a little, not much though.

Last edited by mark a.; Jan 21, 2005 at 07:53 AM.

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Old

Jan 21, 2005 | 10:17 AM

#10

Matts72

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From: Montana Territory

They had valve reliefs, but had no real dish.

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Old

Jan 21, 2005 | 10:28 AM

#11

Torque1st

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I have seen both styles. They may have been just different manufacturers. The dished ones did look to be tiny, something around 0.020" dish???

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Old

Jan 21, 2005 | 03:18 PM

#12

mark a.

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Quote:

Originally Posted by Torque1st

I have seen both styles. They may have been just different manufacturers. The dished ones did look to be tiny, something around 0.020" dish???

Thats what the set I had was.

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