Author Topic: Is a 3.375 too big of a bore for 428's ?  (Read 7130 times)

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427HISS

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Is a 3.375 too big of a bore for 428's ?
« on: July 06, 2019, 12:55:53 PM »
I have a set of MAHLE slugs, is a 3.375 too big of a bore for 428's ?
I see them listed from 3.125, 3.250 and 3.375 for an FE.

machoneman

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #1 on: July 06, 2019, 12:59:12 PM »
Maybe you meant....I have a set of MAHLE slugs, is a 4.375 too big of a bore for 428's ?
I see them listed from 4.125, 4.250 and 4.375 for an FE. ;)
Bob Maag

BH107

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #2 on: July 06, 2019, 03:23:52 PM »
And I’m sure you are referring to the stroke, not the bore.

Heo

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #3 on: July 06, 2019, 04:21:25 PM »
If you meant 4.375 bore  it is to big for a 428



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e philpott

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #4 on: July 06, 2019, 08:58:25 PM »
42 bottles of Beer on the wall 42 bottles of beer, take one down and .... lol

427HISS

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #5 on: July 07, 2019, 01:27:55 PM »
Yes, bore. Anyone want to trade for a 4.125 or 4.250 ?
From what I see, that size is for like 500c.i
« Last Edit: July 07, 2019, 04:14:39 PM by 427HISS »

fe-starliner

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #6 on: July 07, 2019, 04:54:45 PM »
427hss....what FE block has a 3.125 bore?  I'm confused.
1960 Starliner, 406-6V, TKO-600, 4.11 9"
1961 Starliner, 427 4V, SS700 5 speed, 4.56 9"
1968 F-100 SWB, 352 4V, C6, 3.25 9"
2012 Mustang, 226" V6, 6 speed auto, 3.31 8.8"

427HISS

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #7 on: July 07, 2019, 06:17:42 PM »
The piston box reads

4.375. + .005 1.5 3.0MM FILE FIT

FFE267375120

PR# 99-9021 

Ford FE 20cc DISH

Bunch of other numbers and abbreviations as well.

So what size bores would these pistons be for ? I'm confused too.

plovett

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #8 on: July 07, 2019, 06:32:08 PM »
Some aftermarket FE blocks can take a 4.375" bore.

427HISS

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #9 on: July 07, 2019, 06:59:51 PM »
Wish I could afford a BBM, Side Oiler Garage, Genesis, Pond or Shelby FE block.
I have the pistons, rods, Dove complete heads, EFI intake system, MSD etc. Almost everything but the block and frank.

The popular 482 cu. would be very close to my dream engine. 
« Last Edit: July 07, 2019, 07:03:55 PM by 427HISS »

My427stang

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #10 on: July 08, 2019, 06:05:30 AM »
The piston box reads

4.375. + .005 1.5 3.0MM FILE FIT

FFE267375120

PR# 99-9021 

Ford FE 20cc DISH

Bunch of other numbers and abbreviations as well.

So what size bores would these pistons be for ? I'm confused too.

https://www.cnc-motorsports.com/mahle-pistons-ffe267375i20-forged-inverted-dome-4375-bore.html

Those pistons are designed to work with a hard to find 4.375 stroker crank, 6.70 BBC rods and only an aftermarket block at 4.375 bore.  (No Ford block, not even a 427, can be bored to use those pistons)

You may be able to use those with an aftermarket block, a 4.125 crank, and a 6.8o BBC rod, but they will be approx .025 in the hole and require a thin head gasket, and you wouldn't be saving much money and giving up displacement and potentially quench

That is a very unique set of pistons to end up with, unusable for 90% of the people on this forum, and only then by spending quite a bit of money
---------------------------------
Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

427HISS

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #11 on: July 08, 2019, 10:30:44 PM »
I believe my engine builder ordered these because at the time, we bought a Genesis block. Would their block handle that large bore ?
« Last Edit: July 08, 2019, 10:42:23 PM by 427HISS »

ntheogen

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #12 on: July 09, 2019, 11:14:03 PM »
Yes it would but no stock block would go that large.

TomP

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #13 on: July 10, 2019, 02:18:06 AM »
Hey that is what I want to build but I was going to use a flattop. What compression ratio as those with a 72cc chamber?

My427stang

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Re: Is a 3.375 too big of a bore for 428's ?
« Reply #14 on: July 10, 2019, 06:35:04 AM »
Hey that is what I want to build but I was going to use a flattop. What compression ratio as those with a 72cc chamber?

11.41:1 at .005 below deck and a 1020 gasket with a 4.375 stroke crank, under 11:1 if you went short stroke and a 6.80 rod.

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Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch