521 Pump Gas build "Honey Bunny"

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Post  jones on March 14th 2015, 11:14 pm

I have to thank Lem Evans, Phillip Oakley and Jet Boat Bob for building this engine for me. I called Lem and told him I want a pump gas engine for my four wheel drive truck that uses a solid roller camshaft and won't tear it's self to pieces driving to events on the weekends. I also added I'd like to have enough power to act a fool when I want too and have a exhaust note that would send chills thru women and small children.


This is a brief run down, I'm sure I have something wrong and will update as I get more information.
Parts by Lem Evans, Ford
Corner store pump gas
10:1 compression ratio
D9 Block
Ford Racing, 521 nodular iron rotating assembly
Ford Racing, Ported, Super Cobra Jet. Oakley Motorsports
Ford Racing, M-6250-521 camshaft
Ford Racing, solid roller lifters
Double roller timing chain
Standard flow oil pump
Trend push rods
Crower SS rocker arms
Jomar stud girdle
Used Ported Ford Motorsports Intake Manifold
Jomar Power cone spacer
Quick fuel Black Diamond 4700 1050 2 circuit carburetor Oakley Motorsports
Edelbrock Water pump
MSD small cap distributor
Rear sump oil pan

SCJ Flow numbers Phillip Oakley ported
.200/I154/E103
.300/I234/E141
.400/I313/E175
.450/I346/E
.500/I371E203
.550/I382/E215
.600/I386/E228
.650/I372/E236
.700/I370/E243
.750/I373/E247
.800/I373/E248

Assembled & dyno'd by Jet Boat Bob

521 Pump Gas build "Honey Bunny" 3442889C-02C2-43B6-B9DB-FC875F9CC52A_zpsfmqwchtu


521 Pump Gas build "Honey Bunny" 4C3E7F71-B00B-4454-A6D8-5729A996D239_zpst2gy5ucb


Last edited by jones on March 22nd 2015, 5:04 pm; edited 6 times in total

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Post  windsor on March 14th 2015, 11:26 pm

521 Pump Gas build "Honey Bunny" Z6f7vzq3iP6Mw
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Post  jones on March 14th 2015, 11:29 pm

Bob told me over the phone that he didn't mess with any of the correction factors. I'm not sure what that means as I see on the dyno sheet there is some type of correction going on. He just mentioned that a lot of folks add some type of correction that bring the numbers up.

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Post  jones on March 14th 2015, 11:51 pm

What I find interesting is how similar my build is too Lem's other 521 pump gas build. The other engine was ran on a different dyno and I don't know what else could have been different. They look like twins on paper but mine has solid roller and victor intake. Maybe someone else could inform me.

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Post  Gregaust on March 15th 2015, 3:31 am

Nice results , looks like all your orders were filled Smile

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Post  dfree383 on March 15th 2015, 10:36 am


The correction factors are to correct for weather and elevation (
barometer and temp changes) and also type of test standards like SAE.
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Post  Lem Evans on March 15th 2015, 11:24 am

jones wrote:What I find interesting is how similar my build is too Lem's other 521 pump gas build. The other engine was ran on a different dyno and I don't know what else could have been different. They look like twins on paper but mine has solid roller and victor intake. Maybe someone else could inform me.

Not twins at all.

The SFT engine had a Probe piston with a smaller dish than the FRPP piston = more compression.

The FRPP kit comes with a standard tension oil ring set. The SFT engine had a low tension oil ring package = less friction.

The SFT cam had a lot more exh. duration than the FRPP roller = i.m.o. helped the engine peak higher rpm.

Your engine was dynoed with 2-1/4 headers, the SFT was ran with D. Freelander's 2" headers. It remains to be seen which set was better...I'll let others debate that.

The SFT engine had a o.t.b. mafia intake and the FRPP engine had a ported Victor. Again, I'll let others debate the difference.

Of coarse different day different dyno is always a factor. Neither engines correction factors were jacket with, so I'm comfortable that the difference would be only a handful of hp.    

The other engine was not "my project" although I did sell most of the componets in the engine.

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Post  cheatham on March 15th 2015, 6:11 pm

Nice build Jones!
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Post  butterbean on March 16th 2015, 11:07 am

very nice numbers!! congratulations Jones
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Post  jones on March 16th 2015, 1:44 pm

600ftlbs and over from 3700-5800rpm looks like it should have plenty of power to turn some tires over!

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Post  460bronco on March 17th 2015, 11:34 am

Can't wait to see the truck! If you ever want to try it on the dirt drag, I have a set of cut tires you can throw on it to see what it's got! Muddy Joe's is coming up soon. You should try to make a race!
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Post  jones on March 17th 2015, 12:33 pm

460bronco wrote:Can't wait to see the truck!  If you ever want to try it on the dirt drag, I have a set of cut tires you can throw on it to see what it's got!  Muddy Joe's is coming up soon.  You should try to make a race!

I will probably do that, just don't know how long it will take to get the truck together. I've been bleeding Project funds all this time.

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Post  the Coug on March 18th 2015, 8:21 am

Lack of funds or ADD will take over
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Post  jones on March 18th 2015, 8:48 am

the Coug wrote:Lack of funds or ADD will take over

I hope the IS Sledge Hammer plate kit will hold me off on engine mods for a while. As far as funds go, I won't be able to paint the truck or run the Dash-Pak gauge cluster.

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Post  bruno on March 18th 2015, 9:14 am

jones wrote:
the Coug wrote:Lack of funds or ADD will take over

I hope the IS Sledge Hammer plate kit will hold me off on engine mods for a while. As far as funds go, I won't be able to paint the truck or run the Dash-Pak gauge cluster.

That I-S plate is no joke !!!! Twisted Evil
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Post  jones on March 18th 2015, 9:47 am

bruno wrote:
jones wrote:
the Coug wrote:Lack of funds or ADD will take over

I hope the IS Sledge Hammer plate kit will hold me off on engine mods for a while. As far as funds go, I won't be able to paint the truck or run the Dash-Pak gauge cluster.

That I-S plate is no joke !!!!  Twisted Evil

I have sent Lenny a copy of my dyno results for him to price me a torque converter. He has all ready mentioned that he wished I used a Turbo 400 as those converters are built heavier duty. Him saying that kind of messed with me being that I have over $2,500 in a fully built c6.

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Post  460bronco on March 18th 2015, 10:44 am

Get w/ frank on who builds his converters. Chad and I both have PTC units that have been working nicely.
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Post  jones on March 18th 2015, 11:21 am

I just got off the phone with Lenny. He really doesn't believe his normal 10" converters will hold, he is calling his vendors to see if he can get a billet unit and back in-touch with me.

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Post  jones on March 22nd 2015, 5:05 pm

I updated the parts list to give credit where it's due. I really appreciate everyone that made this possible!

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