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Old 01-22-2011, 04:34 AM
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454 weiand 177

What if I used the weiand 177? I could zero deck and use flat tops and my 820s (with bigger valves), that would give me around a 8.5:1 CR. I have read somewhere that the coolest design is a dished piston.. If I ran a supercharger I could drop the CR way down and add boost couldn't I? Would I use a special cam for forced induction? What would that do for power? I have done a little bit of reading but its hard to find people using the smaller ones..

It appears as if this is a good mild supercharger..


Otherwise considering scrapping the 820s (would like to use em though) and purchasing some AFR 265 CNC. Was gonna use a XR288HR cam and 9.7:1 CR. Problem seems to be finding a piston, not sure if they're open or closed chamber heads. The sealed power speed pro -13.80cc dome (.095") are listed for open chambers in jegs..

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Old 01-22-2011, 07:35 AM
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Use a Speedpro TRW L2377 flat top and ported open chamber oval port heads. (781-049 castings) Use a cam with a dual pattern and wider 112+LSA.
Check out Crane Cams. They have many off the shelf blower friendly grinds.
Comp can custom grind a similar blower friendly grind as well.
You are not limited to what is in the catalog. Give 'em a call.
Solid street rollers are best for blown BBC's.
850++cfm carb

Low cr is king.
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Old 01-22-2011, 06:04 PM
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So the flat tops would be better? I had considered using the D shaped cup pistons because I read somewhere they helped with quench or detonation or something.. Not a good idea? Woulda been 8.2:1 with d cupped ones or 8.5:1 for flat tops.

I was noticing they used 112-116 lsa cams. So Hyd Roller be not such a good idea for a blower street use? I'm looking for torque everywhere and good power for the street. Don't wanna go over 6000 RPM.

I found some reading material online from weiand and read most of it so far. From what I understand a 12:1 "effective" CR is ideal for 92 octane. So then a 11:1ish for 90? Thats 4 - 5 psi boost with a 8.5:1 CR (2:1 underdrive).

I planned on doing some minor porting to my 820s (open chambers). Just gonna smooth a few ridges and a bowl blend. They just have such an odd size chamber that its too small for a dome piston and too big for a flat top (my opinion). So now I'm wondering about getting a little "pocket blower" so it will fit under my hood (77 stepside C10).
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Old 01-22-2011, 06:14 PM
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You could use more information on the basics of supercharging, I highly recommend reading Street Supercharging by Pat Gahnal. That would put you on the road to a decision and give you some real insight into supercharging.

Also, use the search function here, supercharging has been beaten to death, there's a wealth of information on this board.
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Old 01-22-2011, 06:52 PM
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Your 820's will get the job done with a flat top L2377 piston.
I would not bother with a retrofit hyd roller for this one.
A good hyd will get it done.
Crane H278-2 #133801
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