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Old 10-04-2010, 09:02 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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  #17 (permalink)  
Old 10-04-2010, 09:22 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, 03:55 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, 08:55 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, 09:09 PM
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ci formula

Thanks again Eric.
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Old 10-10-2010, 08:54 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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