330/361/391
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330/361/391
Are the 330/361/391 FE blocks that are for heavy trucks?
Is the 361 a bored 330, and the 391 a stoked 361?
What is the difference between a 360 and 361 (390 and 391)? Different crank?
Are the heads interchangeable between these engines?
Do distributors change between these and car motors?
Is the 361 a bored 330, and the 391 a stoked 361?
What is the difference between a 360 and 361 (390 and 391)? Different crank?
Are the heads interchangeable between these engines?
Do distributors change between these and car motors?
More Turbo
Joined: Aug 2000
Posts: 721
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From: Floyd, Va
330/361/391
The 360-390 FT blocks are the same blocks with more webbing than fe blocks. The cranks are steel, and can be used in a regular fe, if you get the snout machined down.
The heads from a ft are only good for low rpms, they dont flow well, and have larger stemmed sodium filled valves.
It has been stated here that the later fe blocks were actually from the ft molds.
The only things you would want would be the crank and block. I think the rods would be ok, but im not sure. The rest, should be taken to the local scrap yard.
Tony Warren
Nebraska
The heads from a ft are only good for low rpms, they dont flow well, and have larger stemmed sodium filled valves.
It has been stated here that the later fe blocks were actually from the ft molds.
The only things you would want would be the crank and block. I think the rods would be ok, but im not sure. The rest, should be taken to the local scrap yard.
Tony Warren
Nebraska
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330/361/391
Well I'm looking to maybe Duraspark my 330, and that's why I was wondering.
What's the advantage to a low flow head, i.e. why did they bother making them, when they were making similiar heads that flowed better.
My 330's heads are weak, I had a grind done, but the guy said I would need a lot of inserts next which was going to cost more than I paid for the truck. I'm wondering if 361 heads, or 391 heads would fit, so if I saw a cheap good set, I could pick them up, OR even 360/390 heads....
What's the advantage to a low flow head, i.e. why did they bother making them, when they were making similiar heads that flowed better.
My 330's heads are weak, I had a grind done, but the guy said I would need a lot of inserts next which was going to cost more than I paid for the truck. I'm wondering if 361 heads, or 391 heads would fit, so if I saw a cheap good set, I could pick them up, OR even 360/390 heads....
Post Fiend
Joined: Feb 2001
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From: Missouri
330/361/391
A head with small ports has higher air velocity at low rpms. This equals better fuel atomization and better power on the very very low end. FTs were often governed and do not make any high rpm torque.
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From: Miami U.S.A.
330/361/391
Originally posted by 2speed
I'm wondering if 361 heads, or 391 heads would fit, so if I saw a cheap good set, I could pick them up, OR even 360/390 heads....
I'm wondering if 361 heads, or 391 heads would fit, so if I saw a cheap good set, I could pick them up, OR even 360/390 heads....
To answer your question. Yes the 361 or 391 heads should mount and work fine. All FT cylinder heads have 1.745 - 1.760 Intake valves and anywhere from 1.500 - 1.515 exhuast valves. Stem diameter on valves can differ from different heads. But, if you swp the intire head you should have no problems. Good Luckk
Scotty
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From: Long Island USA
330/361/391
Originally posted by ratsmoker
A head with small ports has higher air velocity at low rpms. This equals better fuel atomization and better power on the very very low end. FTs were often governed and do not make any high rpm torque.
A head with small ports has higher air velocity at low rpms. This equals better fuel atomization and better power on the very very low end. FTs were often governed and do not make any high rpm torque.
'71 360: 215@4400 HP, 327@2600 torque (2 bbl)
'71 390: 255@4400 HP, 376@2600 torque (2 bbl)
'72 360: 196@4600 HP, 291@2400 torque (2 bbl)
'72 361: 210@4000 HP, 345@2000 torque (2 bbl)
'72 390: 201@4400 HP, 316@2600 torque (2 bbl)
'72 391: 235@4000 HP, 372@2000 torque (4 bbl)
Numbers are similar before '72, but '73 and up they are very strange due to "net" ratings and pollution controls. In '71, the 360's did put out a little more power, compression was 8.4, in '72 it went down to 8.0, '71 390 went from 8.6 to 8.2 in '72 - 361/391 had only 7.2 compression.
Needless to say, the FT motors get much more torque at low end. Funny how they produce more HP at lower RPMs for '72. Probably pollution.
art k.
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