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Author Topic:   How much ET is C4 worth over C6
Jerry Piner

Posts: 229
From: staunton, va
Registered: Dec 2001

posted 03-28-2002 10:35 AM     Click Here to See the Profile for Jerry Piner     Edit/Delete Message   Reply w/Quote
I have a C6 behind my 351W and everyone keeps telling me to put a C4 in it that it will run faster. I was just curious as to just how much ET I would pick up in the 1/8 th and 1/4 mile with the C4.

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Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-28-2002 10:39 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
I've heard over .3 reduction in et.


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Posts: 1069
From: Gadsden, Al
Registered: Aug 99

posted 03-28-2002 12:00 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
I went the other way. Ran a C-4 and swapped to a C-6 in my 69. Cost me .12 sec in the 1/8. Not too bad. Figure about 1/2 of that was due to the weight. I weighed botht he C-4 and C-6 on the bathroom scales. Both were dry and no converter. The C-6 was 147 lbs. The C-4 was 105. 42 lbs difference.

The C-4 was a stock unit with a shift kit. The C-6 was stock with a full manual reverse valve body.
Used the same converter with both (had it re-splined for the C-6)

All that's behind me now anyway. Last year went to a Powerglide (known as the powerslide around these boards). Regardless of what it's called it goes rounds and wins money. Best move I've made on the car in a long time.


David Cole

[This message has been edited by Dave_C (edited 03-28-2002).]

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Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 03-28-2002 04:30 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Absolute fact it a minimum of two tenths. This is based on all things being equal. If Dave's converter was a bit off on his C-4 that might attribute his minimal decrease of only .12 (which is still a bunch).
We have back to backed them on dozens (literally) of cars over the years and seen from two tenths to a full second pick up by switching from a C-6 to a well prepped C-4 and appropriate converter.
Our current rolling test bed, the 89 GT P/SA convert picked up two tenths going from a JPT AOD with 2.75 low gear to a JPT C-4.

Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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Posts: 663
From: louisville, ky, usa
Registered: Jul 2001

posted 03-28-2002 11:13 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
ive seen c-4 live well behind built 460's. a friend has a 60's full body mercury with a 460/c4 and he runslow 7's and 6's on nawwwssss, or whatever its called. by the way, medical nitrous will work in your car, practically no difference at all. make friends with an anethesiologist today!

67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11' so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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kid vishus

Posts: 6590
From: middle of NC
Registered: Oct 2000

posted 03-29-2002 12:51 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
When I switched from my c6 with a generic off the shelf TCI convertor that was stalling aorund 4600 to the c4 with a custom built 5600 stall Coan convertor, I picked up 3 tenths in the 1/8 and right around half a second in the qrtr with the same motor.

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