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  #16 (permalink)  
Old 10-04-2010, 04:21 PM
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Nobody walks away from a $1700 motor without a good reason.

Like it was not worth it. The owner probably realized the thing was over worked.
Probabily ditched it for a stock/Near stock LS series motor or a BBC.

Toronto area shops are notorious for overcharging and inflating claimed power output.

We call it "Toronto Horsepower" you have to apply a reality correction factor on these motors as soon as they hit the track.. LOL

Toronto area shops get away with charging $569 for $275 worth of rockers cause the customers there, are willing to pay that.

Canadians are accustomed to taking it up the core from retailers in general.
Not just on gear head parts.

Thats why we have cross border shopping for the ones that won't bend over that far.

Cannot tell you if you will need a small base sircle cam or not.

Get a similar cam to the one you plan on using and trial fit it.
Move it 10deg ahead and 10deg back from its correct position. It it clears the rods after this test fit , you are good to go. Its up to you or your engine builder to check the actual cam in the motor before fireing it up.

If you want a nice street strip cam for your motor check the isky Cams online catalog. If you need a small base circle cam add a "SBC" to the end of the part number when ordering or order direct from Isky Cams.
Custom pushrod fitting will be nessessary.

Realize this if even a "small Base circle cam" does not clear the rods you will be tearing it down and clearancing the rods at additional shop labour cost probabily.
if thats not in the budget then.........

Like I said there is a $$$$reason$$$$ why this motor was abandoned.

Find your self (beg, borrow, steal)a race roller cam or a big race flat tappet cam to trial fit for rod clearance before buying this motor.

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Last edited by F-BIRD'88; 10-04-2010 at 04:44 PM.
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  #17 (permalink)  
Old 10-04-2010, 05:46 PM
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Further: This motor with a flat top piston and a 64cc cylinder heads will result in a compression ratio that is way excessive for the "pump gas" fuel used and purpose.

Either use a 72-76cc head on it or change the pistons.

You want something with a -18 to -22 cc dish volume for a 64cc head on this motor for pump gas.
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  #18 (permalink)  
Old 10-04-2010, 08:02 PM
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Ran your 418 cid<<417.62, on virtual dyno. With a small RV cam, good headers with mufflers, decent heads, 10.25/1 cr with 2.02/160 it has nearly 500 ftlbs of torque and early too. It had nearly 400 hp also.

Kind of surprised me for the cam info I used. Standard 406 by comparison(same imput) was 45 ftlbs and about 20 horses short

very streetable and quick
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Old 10-04-2010, 08:22 PM
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If it's 4.155" x 3.800", it's a 412.

Recommend larger headers. 1 5/8" primaries are too small for this size motor in my opinion. Use 1 3/4".
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Old 10-05-2010, 02:55 AM
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My memory has become unreliable

Quote:
Originally Posted by techinspector1
If it's 4.155" x 3.800", it's a 412.

Recommend larger headers. 1 5/8" primaries are too small for this size motor in my opinion. Use 1 3/4".
I used 3.85" for stroke and just selected "big tube" headers, which I assume to be 1 3/4".. I forgot the stroke spec had been revised down.

Odd thing; I also ran it with 3.8 and 3.75 and results in both cases were noticeably down. This software likes the 3.85 stroke. Never experienced a noticeable change in this range before. This program has always been very close too.

I wonder if in reality the extra ..025" reach hits a sweet range. Sounds like n FE if memory serves...
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Old 10-05-2010, 07:55 PM
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I have noticed some irregularities also, in different sims that I run. For instance, the software REEEEAAAALLLLYYY likes a BBC overbored to 4.350" (+0.100") with the stock 4.000" stroke.
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Old 10-05-2010, 08:09 PM
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ci formula

Thanks again Eric.
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Old 10-10-2010, 07:54 AM
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yada yada yada

Good point F-bird the problem here is there is no competition for parts and when you have 3 speed shops for 6 million people they will charge whatever the hell they want my current motor was built with all parts from summit,maybe this one to,although competition products hass some really good products for reasonable money,as was pointed out to meunlesss its a set of arp bolts or a gasket I forgot ,I will spend my cash south of this rip off city.
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