New found power! hitting up the track tonight - Vintage Mustang Forums

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post #1 of 14 (permalink) Old 05-27-2016, 09:36 AM Thread Starter
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New found power! hitting up the track tonight

To make a long story short I bought a ford racing 427w years ago for my 68 fastback. Car laid down 407rwhp and 412rwtq. She was all done making power around 5600rpm. Which I didn't like. I talked to a bullet racing cams about a new cam and they told me the cam looks great but the valve springs in the motor are ****. So I swapped them out and went back to the dyno and she laid down 430rwhp @6700. Very happy! The car feels so much better too reving. I will be hitting up the track this weekend to test it out. Anyone that has this crate motor should swap springs.

1968 fastback, 427w, 409rwhp 412rwtq, 11.67@116. 1988 LX 5.0, fastest street car in Montana.

Last edited by 1wldpny; 05-27-2016 at 09:39 AM.
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post #2 of 14 (permalink) Old 06-02-2016, 01:06 PM
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Well?

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post #3 of 14 (permalink) Old 06-02-2016, 02:36 PM
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Accurate valve control is very important. I would guess many members here would be better off with lighter weight spring retainers as well. That's a huge difference you got there!

'67 coupe, 390-S, 4spd.
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post #4 of 14 (permalink) Old 06-03-2016, 07:10 AM
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What are the times! Gah! I miss the track.
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post #5 of 14 (permalink) Old 06-03-2016, 08:53 AM
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+1 on valve control. Actually more important on that side of the rocker to have less weight versus the pushrod side.

On my most recent build (460CI 351W stroker) I went with titanium retainers on top pf PAC race springs. Can't say exactly what it did for improvements since I did a number of things, including a swap to an aggressive solid roller, but the overall changes improved the peak HP from 550hp@5600 and redline of 6000rpms to 670hp@6800 and a redline of 7200
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post #6 of 14 (permalink) Old 06-03-2016, 09:05 AM
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Ti retainers have been on my wish list for way too long now!

'67 coupe, 390-S, 4spd.
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post #7 of 14 (permalink) Old 06-03-2016, 09:18 AM
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post #8 of 14 (permalink) Old 06-03-2016, 12:32 PM
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I've got titanium retainers too......or I did. Not sure what I have left as far as parts that survived. Lol
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post #9 of 14 (permalink) Old 06-03-2016, 12:55 PM
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I purchased my COMP Cams Magnum Hydraulic Cam and Lifter Kit with rockers and springs so long ago (mid 80's?) that I can no longer find the specs on the retainers. Its also possible I have 2 kits, Cam kit with lifters and spring & rocker kit. I know I purchased everything from Summit to to work together with my cast heads. Had to have screw in studs installed. The setup has never been run and I have since changed out the rotating assembly from stock to stroker.

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post #10 of 14 (permalink) Old 06-06-2016, 01:10 PM Thread Starter
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She ran 11.502@118.9. Pretty happy with that! it's still spinning out of the hole too. Gained almost 3mph from my last best.

1968 fastback, 427w, 409rwhp 412rwtq, 11.67@116. 1988 LX 5.0, fastest street car in Montana.
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post #11 of 14 (permalink) Old 06-06-2016, 01:25 PM
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Nice little improvement for sure.


68 J code sprint, 408W
11.47@123.35mph in street trim.
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post #12 of 14 (permalink) Old 06-06-2016, 02:04 PM Thread Starter
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Thanks! Here is a slow mo vid of my launch. Seems to hook and then spin?
https://youtu.be/u0syk1PPdbM

1968 fastback, 427w, 409rwhp 412rwtq, 11.67@116. 1988 LX 5.0, fastest street car in Montana.
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post #13 of 14 (permalink) Old 06-06-2016, 09:56 PM
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Went with beehive springs with titainium retainers much lighter than the dual spings and steel retainer. Went from 6400 RPM valve float to 7800 so far with no float. Picked up a lot more spring pressue too.
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post #14 of 14 (permalink) Old 02-21-2017, 07:57 PM
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Quote:
Originally Posted by 1wldpny View Post
Thanks! Here is a slow mo vid of my launch. Seems to hook and then spin?
https://youtu.be/u0syk1PPdbM
https://youtu.be/mGZ8ST5G7_4
Heres my launch with a 331 and stock T5 with 3.89 8 inch rear , looks like I have a little clutch slippage , still a 1.64 60 ft at 7.4 92 mph
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