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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Carb cars vs. EFI cars

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    7/27/2022 8:14 PM  #1

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Carb cars vs. EFI cars

    So is the roller cams different??

    Last edited by BILLY WALTON from GEORGIA (7/27/2022 8:15 PM)

    Its really me....I fixed my caps lock .
     

    7/28/2022 5:50 AM  #2

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,495

    Re: Carb cars vs. EFI cars

    The cam doesn't care, BUT there are a few things to consider:

    1.) What firing order do you want it to have?   Ford made the move to the 351 order for a reason.  I'd stick with that.

    2.) Do you need a reduced base circle cam?  Some strokers with typical nut and bolt rod bolts have clearance issues with the bolts and the cam, so they require the use of a reduced base circle cam.  If the rods are capscrew this should be a non issue. 

    3.) Are you running EFI or a carb?  A cam for an EFI application will typically be ground on a wider LSA so the computer has an easier time getting it to idle acceptably. Most EFI cams are ground on a 112-114 LSA, even for a performance grind.  A cam for a carb application could be as tight as 108.  You may get a lumpier idle, but can still tune the carb to run acceptably. 
     

     

    7/28/2022 7:29 AM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,248

    Re: Carb cars vs. EFI cars

    What is the effect of LSA on idle vacuum?  For those with power brakes

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    7/28/2022 7:51 AM  #4

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
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    Re: Carb cars vs. EFI cars

    Howard’s had recommended a LSA of 112 .   
    It’s a standard bore but changing the pistons to flat top not gonna be a stroker just a 1998 Explorer engine with flat tops and the GT40P heads with a performer intake and 570 Holley avenger carb . Petronix 3 distributor also Hi-po manifolds. TKO how do I know about the small circle cam you mentioned?

    Its really me....I fixed my caps lock .
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    7/28/2022 7:55 AM  #5

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Carb cars vs. EFI cars

    The Howard’s cam was a 221275-12 and was a 270/278 and 528/533 wanting something close to that it can be in a different brand if I can find one. Howard’s are having trouble finding blanks to grind.

    Its really me....I fixed my caps lock .
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    7/29/2022 5:23 AM  #6

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
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    Re: Carb cars vs. EFI cars

    BILLY WALTON from GEORGIA wrote:

    Howard’s had recommended a LSA of 112 .
    It’s a standard bore but changing the pistons to flat top not gonna be a stroker just a 1998 Explorer engine with flat tops and the GT40P heads with a performer intake and 570 Holley avenger carb . Petronix 3 distributor also Hi-po manifolds. TKO how do I know about the small circle cam you mentioned?

    If its not a stroker don't worry about it. 

     

    7/29/2022 10:06 AM  #7

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Carb cars vs. EFI cars

    TKOPerformance wrote:

    BILLY WALTON from GEORGIA wrote:

    Howard’s had recommended a LSA of 112 .
    It’s a standard bore but changing the pistons to flat top not gonna be a stroker just a 1998 Explorer engine with flat tops and the GT40P heads with a performer intake and 570 Holley avenger carb . Petronix 3 distributor also Hi-po manifolds. TKO how do I know about the small circle cam you mentioned?

    If its not a stroker don't worry about it. 

     its gonna be standard bore if I cand find some standard bore flat top pistons too....TKO sent you a message
     

    Its really me....I fixed my caps lock .
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    7/29/2022 5:52 PM  #8

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Carb cars vs. EFI cars

    Standard bore flat top Forged pistons will be here monday

    Its really me....I fixed my caps lock .
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    7/30/2022 11:17 AM  #9

    rpm
    Senior 24-7 FYI Addict

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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,651

    Re: Carb cars vs. EFI cars

    BILLY WALTON from GEORGIA wrote:

    Howard’s had recommended a LSA of 112 .   
    It’s a standard bore but changing the pistons to flat top not gonna be a stroker just a 1998 Explorer engine with flat tops

     
    What's wrong with the stock pistons if it's a standard bore? Are not stock pistons flat tops with valve reliefs in them? What change are you expecting with different pistons?

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    7/30/2022 3:29 PM  #10

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: Carb cars vs. EFI cars

    Bearing Bob wrote:

    BILLY WALTON from GEORGIA wrote:

    Howard’s had recommended a LSA of 112 .
    It’s a standard bore but changing the pistons to flat top not gonna be a stroker just a 1998 Explorer engine with flat tops

     
    What's wrong with the stock pistons if it's a standard bore? Are not stock pistons flat tops with valve reliefs in them? What change are you expecting with different pistons?

     

    it has the explorer dished pistons I should increase the compression a little. 
     

    Its really me....I fixed my caps lock .
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