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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

got bored...thumper vs. stock e7 comparison pics

  • Thread starter Thread starter cenok is family
  • Start date Start date Apr 29, 2008

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Apr 29, 2008
#1
  • Apr 29, 2008
  • #1
well, i just picked these up from foxfan (thanks again man!), and i was sitting around and decided to do kind of a side by side comparison with a set of stock e7's i had laying around. i haven't put them on yet, so no performance comparison yet. also, they're assembled, so i have no pics of the bowls. without further adu, here are the pics.

stock e7 chambers:


thumper chambers with manley 1.94/1.60 valves:


here's a close up to see the valve size difference. stock valves:


thumpers with 1.94/1.60's:


stock intake ports:


thumper intake ports:


here's a closer look, side by side:


stock exhaust ports:


thumper exhaust ports:


a close up of the exhaust ports side by side. and NO thats NOT build up on the stock port, that's the actual casting/port shape :


well thats all the pics i took. hope this gives a little insight to people thinking about getting some thumpers. i can't wait to get them on! thanks for looking!
 

S&B

I hate my CT. :(
10 Year Member
Dec 18, 2005
1,634
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Cheesehead
Apr 29, 2008
#2
  • Apr 29, 2008
  • #2
nice what are the flow numbers on the stock vs. thumper again?
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Apr 29, 2008
#3
  • Apr 29, 2008
  • #3
stock flows 156 intake and 108 exhaust at .500 lift. thumpers flow 218.9 intake and 154 exhaust at .500 lift.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,217
17,900
224
Massachusetts
Apr 29, 2008
#4
  • Apr 29, 2008
  • #4
Looks nice!


I'd index a set of plugs or maybe two sets to each chamber while you have the heads out.
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Apr 29, 2008
#5
  • Apr 29, 2008
  • #5
Mustang5L5 said:
Looks nice!


I'd index a set of plugs or maybe two sets to each chamber while you have the heads out.
Click to expand...

thanks! what do you mean by index? make a note of which way the electrode is facing?

oh btw, 5L5, do you still need those tranny parts? i got off work and completely forgot about it.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,217
17,900
224
Massachusetts
Apr 29, 2008
#6
  • Apr 29, 2008
  • #6
cenok is family said:
thanks! what do you mean by index? make a note of which way the electrode is facing?

oh btw, 5L5, do you still need those tranny parts? i got off work and completely forgot about it.
Click to expand...


Yes, thread a plug in so that the open face of the electrode points towards the intake valve. That way the spark is not shielded by the ground strap. If you look at the pic of the stock heads with the spark plug in, you can see the open face is pointed at the exhaust valve. You want it to point at the intake. You may need to buy more than 8 plugs to do this..but if you are running coppers they are cheap. It's easy as hell to do now with the heads off. Just mark what plug goes to what cylinder #


Yes, i still need those tranny parts if you have them. I'll PM you.
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
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Norman, Ok
Apr 29, 2008
#7
  • Apr 29, 2008
  • #7
Mustang5L5 said:
Yes, thread a plug in so that the open face of the electrode points towards the intake valve. That way the spark is not shielded by the ground strap. If you look at the pic of the stock heads with the spark plug in, you can see the open face is pointed at the exhaust valve. You want it to point at the intake. You may need to buy more than 8 plugs to do this..but if you are running coppers they are cheap. It's easy as hell to do now with the heads off. Just mark what plug goes to what cylinder #


Yes, i still need those tranny parts if you have them. I'll PM you.
Click to expand...

cool, thanks for the heads up man. how do i go about getting them to face the valve? pretty much do i just keep threading them in one by one until i get one that fits that particular chamber correctly?
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,217
17,900
224
Massachusetts
Apr 29, 2008
#8
  • Apr 29, 2008
  • #8
Yup, that's why i said you may need more than 8...but you could always return the extras


It's not a huge gain...but it's easy as hell to do at this point and does help a tiny bit.
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Apr 29, 2008
#9
  • Apr 29, 2008
  • #9
Mustang5L5 said:
Yup, that's why i said you may need more than 8...but you could always return the extras


It's not a huge gain...but it's easy as hell to do at this point and does help a tiny bit.
Click to expand...

yeah i'm definitely going to do it. i'll just take my heads up to work (autozone) and pull every motorcraft sp-450 plug out and find the ones i want. thanks again man!
 

S&B

I hate my CT. :(
10 Year Member
Dec 18, 2005
1,634
695
204
Cheesehead
Apr 29, 2008
#10
  • Apr 29, 2008
  • #10
cant your computer at autozone tell you that ?
 

cenok is family

15 Year Member
Jun 25, 2003
1,409
69
79
Norman, Ok
Apr 29, 2008
#11
  • Apr 29, 2008
  • #11
S&B said:
cant your computer at autozone tell you that ?
Click to expand...

yeah, but then i'd have to determine if my car has power steering and A/C before i can get the right plugs.
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,217
17,900
224
Massachusetts
Apr 29, 2008
#12
  • Apr 29, 2008
  • #12
The computer knows everything

 

ryan218

In just 10 years, I'll be old enough to drive!!!!
Dec 28, 2005
0
1
38
columbus ohio
Apr 29, 2008
#13
  • Apr 29, 2008
  • #13
those really are not bad heads for the money.

dose anyone have a comparsion to what they flow vs a pair of untouched GT40 heads?
 
5

5.0ina66

Member
Jun 6, 2003
664
0
16
Ohio
Apr 30, 2008
#14
  • Apr 30, 2008
  • #14
ryan218 said:
those really are not bad heads for the money.

dose anyone have a comparsion to what they flow vs a pair of untouched GT40 heads?
Click to expand...

GT40s flow ~190/130 @ .500 vs 219/154 for the thumpers. Supposedly, GT40s will flow over 160cfm on the exhaust after a full port job...THAT is one thing I've read recently that I'm having a hard time believing.
 

Foxfan88

My Grandpa has great wood.
Sep 13, 2004
2,487
4
0
Miami, Ok
Apr 30, 2008
#15
  • Apr 30, 2008
  • #15
ryan218 said:
those really are not bad heads for the money.

dose anyone have a comparsion to what they flow vs a pair of untouched GT40 heads?
Click to expand...


thumper claims they flow better than untouched gt-40s.
 

Mr. Rustypwnz

Advanced Member
Jun 1, 2005
1,761
63
69
indianapolis/ valdosta ga
Apr 30, 2008
#16
  • Apr 30, 2008
  • #16
THAT is one thing I've read recently that I'm having a hard time believing.
Click to expand...

put em side by side and compare, my ported p heads (self ported) are bigger than the exhaust side on my old thumpers....
gt40's start out at 195cfm on the intake, while a e7 starts at 156cfm, so why start off with a lesser head? its not like they are really expensive either...
 
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