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It was actually ran today, so we know what it made, but will give you a chance to guess anyway.

This motor is going in my wife's 64 fury vert (if the body shop ever gets done with it). Will have a 727 and 8 3/4 with 3.23's behind it. Meant to be a nice cruiser.



413 block bored to 4.25", 3.75 stroke, 426 ci.
440 source heads worked over a bit by Brian (IMM/OU812).
Flow numbers
Lift Int Exh
.200 150 113
.300 220 145
.400 270 174
.500 292 195
Indy SR 1.5 rockers
Comp XE275HL Cam, .525/.525 lift, 231/237 @ .050, 110 ls, installed 4 degrees advanced
Ross flat tops, zero deck, 9.6:1 cr
Performer RPM manifold.

First, guess what it made with a holley 770 street avenger, vacuum secondaries

Then, what did a holley 950hp do for it?

So what do you think it made for hp and tq?

Rob, you don't get to play.


BTW, Mrs. G-bob's already asking if she can run the car down the strip.

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Well, here it is....

With the 770 carb, it made a best hp 459 at 5500 rpm and 485 tq at 4500 rpm.

With the 950hp, it made 470 hp at 5500 and 505 tq at 4200 rpm.

Here is a video of the last dyno pull.

426 dyno video


Thanks Brian, Mrs G-bob loves it.

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Good to hear Glenn! Thank you!!
I will say that the 950 was actually jetted perfect for this engine, we had average 12.75:1 and it was in the low 13's at top end of the pull.

The 950HP carb was worth 20ft.lbs. of TQ!! Average HP gain with that carb was 15HP from 3000-5700rpm.
Average TQ gain was 20ft.lbs. from 3000-5700 rpm.
It idled down nice at 850rpm, nice chop to the idle and was clean and crisp even with the 770 Avenger carb.
Now it's time to move on to the other project....