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 Post Posted: Wed Dec 03, 2008 2:23 pm 
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Joined: Mon Oct 29, 2007 7:07 pm
Posts: 1422
Location: Florida
The difference is the heads are purpose built RFD's from bare castings for a large CI, not cup takeoffs, the plan was to keep valvetrain speed down for reliability. Over 440 CFM, big ports. Plus the torque from the long arm will help, my 427 picked up at least 2 tenths over a 406 with the same 23˚ stuff. And the 100 lb savings with the aluminum block will also help. Time will tell...


Last edited by jmarkaudio on Fri Dec 26, 2008 3:25 pm, edited 1 time in total.

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 Post Posted: Wed Dec 03, 2008 5:28 pm 
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Joined: Sun Nov 30, 2008 8:23 am
Posts: 81
Location: Camanche IA
Scott Smith wrote:
Good luck with that Mark. I just dont feel that big arm is an advantage without a big bore to go with it.

Just like the 434s I always outrun with a 406.

I think a 421 or a 422 is a sweet combo for a SB2.2. Plus I already went through the combo learning curves. :D


What do you consider to be a better bore with a 4" stroke?


I like the way you think, or your comment about beating the 434's but I think it is the whole over all package. I have surprised a few people when I tell them it is just a LT1.  ;-)

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 Post subject:
 Post Posted: Wed Dec 03, 2008 11:22 pm 
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Joined: Sun Nov 11, 2007 10:33 am
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Location: Montgomery, Alabama
Quote:
What do you consider to be a better bore with a 4" stroke?


Not enough room in a small block. Plus the piston speed gets a little fast over 3.875 degrading ring seal.


Quote:
I like the way you think, or your comment about beating the 434's but I think it is the whole over all package.


Same heads same weight car and gear the 406 was faster using several different cars and combos.


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 Post subject: Re: 23° VS SB2.2
 Post Posted: Sat Nov 05, 2011 3:23 pm 
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Joined: Fri Nov 04, 2011 11:48 am
Posts: 17
New to this site,and putting together an aluminum Donovan 427" with SB2 topend.Just starting to order the parts have the SB2 topend on it's way,once here will order Donovan block.Will need info on getting right pushrods.Plan to run solid roller cam with offset lifters.Plan to run Callies Magnum crank,Oliver rods,pistons not sure. Hoping for suggestions
Mike Ross


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