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400/512 combo #298712 04/25/09 12:53 AM 04/25/09 12:53 AM
Joined: Feb 2004 Posts: 964 Nanaimo, B.C. GwaiiEagle OP Mannix
GwaiiEagle OP Mannix Joined: Feb 2004 Posts: 964 Nanaimo, B.C.	I am having the block sonic checked and magnafluxed and then off to the machine shop. I was hoping to save some bux by using as much off the old blocks I have on the new. What exactly should I consider reusing? Can something like main caps be reused or must they be new? The oiling sytem for example? Distr. gear? The second question is what is the most the compression can be if the gas is 91 here? I mean if I dialed the timing back for the street and used the 94 you get off island. How much compression can I use with aluminum heads and less timing?

Re: 400/512 combo [Re: GwaiiEagle] #298713 04/25/09 02:03 AM 04/25/09 02:03 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Can something like main caps be reused? The oiling sytem for example? Distr. gear? The second question is what is the most the compression can be if the gas is 91 here? How much compression can I use with aluminum heads and less timing? Mainly street driven? Main caps yes intermediate shaft I'd replace. Get a new Melling std vol oil pump. Keep 3/8 pickup if the screen cleans up though they are cheap, baffle the pan. #1 You must get .035"-.040" quench which requires CAREFUL measuring as the piston rocks at TDC & clay is not accurate enough & that clearance is a small window. If quench you can run a CR in the 10's easily w alum heads & probably somewhere in the lower 10's w iron heads live every 24 hour block of time like it's your last day on earth

Re: 400/512 combo [Re: RapidRobert] #298714 04/25/09 10:55 AM 04/25/09 10:55 AM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	I dont like the 4.15 or larger crank in the B wedge if it's a street engine. The pistons are very short. As a result, as things wear, they will rock a lot. I would not recommend a quench tighter than .040 on them, and the rings (including the all important oil set) will not be as good for nearly as long. So the biggest I'd go is 3.915 stroke. JMO. Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Re: 400/512 combo [Re: moper] #298715 04/25/09 11:02 AM 04/25/09 11:02 AM
Joined: Feb 2004 Posts: 964 Nanaimo, B.C. GwaiiEagle OP Mannix
GwaiiEagle OP Mannix Joined: Feb 2004 Posts: 964 Nanaimo, B.C.	The 470ish stroke would be fine by me since it suits the Edelbrocks heads better. I have not bought the kit yet. Anybody else have a vote on this?

Re: 400/512 combo [Re: GwaiiEagle] #298716 04/25/09 11:31 AM 04/25/09 11:31 AM
Joined: Oct 2005 Posts: 4,941 WI Dcuda69 master
Dcuda69 master Joined: Oct 2005 Posts: 4,941 WI	I did a 470/400 for my a-body. Eagle 3.900 crank,Manley H-beams,Diamond pistons(small dish that mirrors the 84cc Eddy chamber)10.2:1,small Comp solid street roller. It runs easily on 93(has run on 89,oops). Great combo for a street car! Idles at 850 rpm(12" vac.)good low end and spins easily to 6k.

Re: 400/512 combo [Re: moper] #298717 04/25/09 11:32 AM 04/25/09 11:32 AM
Joined: Aug 2003 Posts: 8,716 Baltimore/Denver 64Post master
64Post master Joined: Aug 2003 Posts: 8,716 Baltimore/Denver	Quote: I dont like the 4.15 or larger crank in the B wedge if it's a street engine. The pistons are very short. As a result, as things wear, they will rock a lot. I would not recommend a quench tighter than .040 on them, and the rings (including the all important oil set) will not be as good for nearly as long. So the biggest I'd go is 3.915 stroke. JMO. If you want longevity out of this motor the 470 is the way to go. It's one of those combos that work out really well on paper and in practice. Last edited by 64Post; 04/25/09 11:33 AM.

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