Good high performance crate engine for KOH rig? - Ford Bronco Forum
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post #1 of 8 (permalink) Old 03-12-2017, 11:12 PM Thread Starter
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Good high performance crate engine for KOH rig?

So after going to the KOH race to watch a couple times and thinking "why the hell am I watching instead of racing?" I ordered a pre-fab "Race spec" chassis, a couple front rockwells, and a set of fairly decent 47s.

Needless to say this project hasn't been moving nearly as fast as I'd like.. it's been about 2 years in the works and I've got the axles worked over a bit and the 4-link front and rear suspension is basically done (except coilovers, which I still need)

I was thinking of building an old 454 with a few upgrades, but as much as i like doing a terrible job of building performance engines, I'm thinking this time I should possibly go for a professionally built one that actually makes the horsepower I really want.

Budget is $5-10k for the engine, depending how much additional horsepower the dollars after $5k cost me.. if it's substantial gains i'll spend the additional money, but if it costs me twice as much for only 10 or 15% more horsepower, of course that doesn't make sense.

So the question is, does anybody have any recommended engine builders, or have recommendation for a "production" performance engine available from a manufacturer? I'd like to be in the 700HP/TQ rage, but of course it all comes down to budget. I was thinking chevy big block as the most bang for the buck, but I'm open to any make.
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-Ryan

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post #2 of 8 (permalink) Old 03-13-2017, 05:55 AM
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8.1 LS would be another good option I think.
There are a few Big Block Ford guys that could get you close to that and be in your budget. But in a KOH rig I would pick what ever I am most familiar with as knowing it inside and out will go a lot further then max power in the kind of race, I think. I also think you could find a wrecked something and be close to the power your wanting and on budget. For example Friend just got a totaled GT mustang for 3k, with 50k miles on its drivetrain which most will end up in a hotrod.


The Street Queen: '92 Eddie Bauer- C6 Swap, Roller 357W 400hp/400ft-lbs, SCT Tuned, 4" Lift, 4.10's,
Go Fastish Build: '78 Custom- 4" Deaver Lift, Mild 460, Full Cage, 4.10's
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post #3 of 8 (permalink) Old 03-13-2017, 10:21 AM
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Find an old Lincoln navigator with the 4v 5.4 engine. The 4 cam mod motors make a ton of power, and are now pretty cheap. My 03 mach1 with the 4.6 4 cam is a rocket on rails. 281 cubes pumping out 325 horses in stock form with exhaust. They are all aluminum too so it'll save tons of weight over a BBC, and can be run with a carb if you so choose. I've seen twin turbo dohc 4.6's over on the registry making in excess of 1000 HP.

94 Bronco XLT. Beefy 351, 6" , 37's, 4.88: burnt
85 Bronco custom, 4" 37's, locked 4.56, 300 i6 4 bbl, np435/208
96 f350 XL, rclb, 351, c6, BW4407 xfer
78 f150 Ranger, 351m, t18, np205, rusty
90 f150, 95 f250, 96 f350 psd: stolen, sold, and burnt, respectively.
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post #4 of 8 (permalink) Old 03-13-2017, 12:14 PM
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I agree with that engine choice also. Would sound very unique too.
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The Street Queen: '92 Eddie Bauer- C6 Swap, Roller 357W 400hp/400ft-lbs, SCT Tuned, 4" Lift, 4.10's,
Go Fastish Build: '78 Custom- 4" Deaver Lift, Mild 460, Full Cage, 4.10's
Build Thread http://www.fullsizebronco.com/forum/...8-project.html
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post #5 of 8 (permalink) Old 03-13-2017, 02:07 PM Thread Starter
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A coyote 5.0 from a wrecked mustang is definitely on the list of good engine options if I can stumble across one.

Looks like I may have a line on a 5.3L LS engine as well. I understand they make "about 400hp" with a good tune... so far that's probably at the top of my list given that I can get it at a good price, but before i pull the trigger I'd still be interested in what my options are to get into the 600+hp range with a "turn key" style crate engine.

I'll definitely go EFI no matter which route I go, but I can always run one of those throttle body injection kits in place of a carb if i go with an "old school" style engine.

-Ryan

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post #6 of 8 (permalink) Old 03-13-2017, 04:55 PM
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Any crate engine over 500hp is gonna be maxing out your budget, if not surpassing it. The reason i suggeted the mod motor is that they are now plentiful and cheap. My mustang I referenced earlier gets 23 mpg and has a 6800 rpm redline. It has terrific power and throttle response from 3000 up to red line. It will not make a clean jump off the line on street tires and pushes that little stang to 60mph in 5 seconds and 100 in about 11 seconds, if you can keep the tires planted. I shift out of third at 107 mph, and it still pulls at 145 mph. This is in stock form, with a cat-back exhaust as the only mod.
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94 Bronco XLT. Beefy 351, 6" , 37's, 4.88: burnt
85 Bronco custom, 4" 37's, locked 4.56, 300 i6 4 bbl, np435/208
96 f350 XL, rclb, 351, c6, BW4407 xfer
78 f150 Ranger, 351m, t18, np205, rusty
90 f150, 95 f250, 96 f350 psd: stolen, sold, and burnt, respectively.
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post #7 of 8 (permalink) Old 03-14-2017, 12:28 PM Thread Starter
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What is the bell housing bolt pattern on a mod motor? I know they are good performers.

-Ryan

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post #8 of 8 (permalink) Old 03-23-2017, 12:01 AM
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Ok. I have your answer here sir. A destroked ls3 with a 4.8 crankshaft, 6.300 rods, cnc ported ls3 heads, ls3 intake and ls1 throttle body. I have all the math written down on my desk at the office for the different compression ratios. Was going to run 9.5:1 and turbo it in my 240sx but life happens and I sold the car. You can run 8k rpm with the 24x wheel and tunable ls1 computer . You use the stock computer and you pay gm about $150 for access code. Then it's basically a full tunable standalone. Easily in the 600hp range and around 5k to build.
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