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Discussion Starter #1 (Edited)
A friend and I are looking at building an engine from spare parts. We are looking at a Gen 6 standard 502 block that is currently a 565. The bore is 4.535 and the stroke is 4.375. We don't know the condition of the block yet but we were wondering if it needs to be bored out what would be the next bore level (4.56)? This is not a Bowtie block. I have also read some old forum posts and some say you can't and some say can go all the way out to a 4.6 bore. I am sure either way we will have to get it sonic checked.
 

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A friend and I are looking at building an engine from spare parts. We are looking at a Gen 6 standard 502 block that is currently a 565. The bore is 4.535 and the stroke is 4.375. We don't know the condition of the block yet but we were wondering if it needs to be bored out what would be the next bore level (4.56)? This is not a Bowtie block. I have also read some old forum posts and some say you can't and some say can go all the way out to a 4.6 bore. I am sure either way we will have to get it sonic checked.
I would feel better just honing a few thousandths and having pistons made if that's possible. .060" over is supposed to be max on those blocks. Racetec will make up the pistons without breaking the bank, but make sure that rings are available in the size you are looking at. Make sure if they did any clearance work for the existing crank that it's not a hack job.
 

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I would feel better just honing a few thousandths and having pistons made if that's possible. .060" over is supposed to be max on those blocks. Racetec will make up the pistons without breaking the bank, but make sure that rings are available in the size you are looking at. Make sure if they did any clearance work for the existing crank that it's not a hack job.
Depending how "junk yard" this build will be, you could do as Barry said and hone it a thou or two and either have pistons made, or if the other pistons are in decent shape have Line2Line coat the skirts and reuse them. depending on what you are expecting for power and longevity might be my determining factor. But if the skirts and ring lands look good and they have not been munched I might reuse the pistons. It is just a thought anyway to kick around some other ideas. Also depending on the application a short fill of the block might not be a terrible thing. Also, depending on the cost of custom pistons vs off the shelf, you may find and off the shelf piston and have Line2line coat it still for less than the custom pistons. I have not ordered customs in a while so I don't know current cost these days. I am sure Barry would have a much better idea than I.

Anyway, just more idea. I love low budget builds!

Paul
 

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Discussion Starter #4
Well I missed a couple good deals on blocks and rotating assemblies. So I will have to wait a while. In the meantime what do you guys think about these heads with this intake and carbs. The heads are Canfield and have 350cc intake runners, 119cc chambers with a 24.5 intake valve angle. I would think these heads would work good on a 540 engine or bigger. I am wondering if this Edelbrock Tunnel Ram (7075) with these Holley 750's (6109) would work with these heads on say a 540 or worst case scenario 496?

1042267


1042268


1042269


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1042272


I found the old Canfield website via the Wayback Machine so here are the flow numbers:

1042265


1042266


1042276


1042277
 

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They should work just fine. The heads will want porting to be a good match to what ever cubic inches you end up going with. If I remember correctly Scott liked porting those casting.

Paul
 

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Discussion Starter #7
They should work just fine. The heads will want porting to be a good match to what ever cubic inches you end up going with. If I remember correctly Scott liked porting those casting.

Paul
If I remember right Scott used the 310 cc version of the heads a lot but I am not sure if he ever built an NA engine with the 350 cc version of the heads.
 

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350cc is a good size for 565 and up N/A. Make sure you get a custom ground cam to match. The tunnel ram you have will work for a mild build.
Nice parts for a throw together.
 
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