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Racing For those that take thier Caddy's to the track

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Old 09-29-2006, 02:24 PM   #1
mcversch
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Default stock heads

what level of horsepower can a race ported set of 76cc heads support on a naturally aspirated engine. i'm just curious what kind of numbers you guys are getting before switching to aftermarket heads. i think i heard some one here has close to 850 horses with the iron heads. I don't want to run NOS.
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Old 09-29-2006, 03:34 PM   #2
STDog
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What aftermarket heads would you switch to?

I though the Bulldogs were out of production and no other supplier has stepped up yet. I understamd somome is working one a new head, but it's not ready yet.

As to ported heads with larger valves, I've seen 310cfm for a "standard" porting job. Maybe 325, 350 with lot;s of work?

How much power can you make you that flow, if you have the intake to supply air and fuel and turn it at 6000 RPM?
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Old 09-29-2006, 05:53 PM   #3
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yeah i was refering to a set of used bulldogs. ok so you can get them to breath up to 310 or so cfm. that's a more precise answer than i was looking for haha. Thank you very much

as for new aftermarket heads, i was thinking of getting an old set of bulldogs then making my own casting of them. I hear they weren't cast very well.
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Old 09-29-2006, 06:31 PM   #4
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ok, in theory with around 310-320 cfm those heads should support around 650 - 660 horsepower at the flywheel. This is obviously just theory though, there are so many factors, like friction, balancing, component weight, etc. this assumes you've got everything else to go with the heads too $$$, and i'm sure you can make more than that.

are the piston pin locations off centre from the middle of the piston? if so, has anyone installed them backwards to get more power?

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Old 10-01-2006, 08:20 AM   #5
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I believe the pins are centered in the Caddy motors. There is no "arrow" on new pistons to tell you how to orient them...so the pins centered.
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Old 10-01-2006, 08:29 AM   #6
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oh ok, they are centered eh. thank you very much for the info.
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Old 10-11-2006, 08:44 AM   #7
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mcversch....
I was looking at some info earlier, and I think I misspoke on the piston pin offset. The stock caddy pins are offset .060" in the piston.

So flipping them around might theoretically give you a tad bit of free power. Theoretically.

Sorry for the confusion.
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Old 10-11-2006, 12:45 PM   #8
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cool, they are offset eh.

my 302 ford pistons are offset 0.060" as well. by putting them in backwards the 302 gained around 25 hp. It just reduces the rod angle, so the engine acts more like a stroker. the engine runs a little louder though (probably wear out faster too) you notice it on cold starts. i wouldn't do it to a daily driver, but for any type of racing (especially when rules say you need stock parts) it is great. I had a good advantage in stock car racing. some chevy guys do it too.

Thanks for the info.
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