Thread: 1955 Chrysler 331 Hemi build for '34 Plymouth Coupe

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Very nice work and awesome tools. I like your garage to. Very nice! Also, if you're getting snow there, that means we'll probably be in deep freeze and buried.

Intake ports are cleaned up for the most part, and I have 4 exhaust ports done. Not porting for power, just cleaning up the bowls, and smoothing out any bumps. I work slow because my damn hand goes numb from a pinched nerve I guess. It's okay though, it is not like it needs to be running by Monday... I will be getting some intake and exhaust gaskets to port match, then I can put them together.

Happy Memorial Day to all...

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Happy happy joy joy. Thank each and everyone of you from the heart. Edward.

Finished the last 4 exhaust bowls, and port matched the intake. They were really close, and only had to round a few corners. That last thing I did was cc the heads, and they were pretty close to what I calculated with calculus and measurements.

Just my ignorance showing but you bored the block .060 over before you had pistons in hand? Has piston making gotten so advanced that now every ones' .060 over pistons are exactly .060 over. Just wondering. Beautiful work BTW.


Jack.

Originally Posted by Jack F

Just my ignorance showing but you bored the block .060 over before you had pistons in hand? Has piston making gotten so advanced that now every ones' .060 over pistons are exactly .060 over. Just wondering. Beautiful work BTW.


Jack.

Without boring it first, you don't know what size pistons to get. You normally bore the hole 0.005" shy of the finished size, and hone the last 5 out to achieve your clearance. When I say I bore it for 0.060" pistons, I mean I bored it to 0.055", and will hone the last 0.005" when I have the pistons. Piston technology and materials have gotten much better, and they are more consistent. And, before you say there are different clearances between cast and forged pistons, the piston has the intended clearance built into it. Ideally, you could bore to the numerical bore oversize, and it should be proper, but the best way is to hone to the actual pistons.

Same in my shop--------Like I had a early 30 Hudson (or something similar) and it was necessary to get to a finished size before having Egge make pistons--------

Many times on used, relic, numbers matching restores-----will use CK 10 to get a nice complete pattern with the course stones(diamond) , measure to find biggest hole, order pistons (limited availability) and then put back in hone for finish size.

Thanks guys for the clarification.

Jack.

Been a while, but I decked the heads to match the chamber volume. The small head started out at 105cc, and after cutting 0.014" to clean it up, it went to 102.8cc. So, at approximately 0.0064"/cc, I started to whack away at the 112cc head. The math said to cut 0.056", but I was a little leery with that. I stopped at 0.045", and it spec'd out to 103.5cc, close enough for me. I am not too happy about the mismatch though. The difference was in the seat inserts lower in the head, creating a larger volume. I might have to find another matched set (from the same motor), and start over. Even though I can cut the intake side of the heads, it is not going to be easy due to the mismatched amounts removed from the heads.

Ya know what I like best about you 69Bee, is your proper presentation of numerical values, such as 0.025", 1.700", 0.060". There is no question about what you are saying. Thank you.

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Originally Posted by techinspector1

Ya know what I like best about you 69Bee, is your proper presentation of numerical values, such as 0.025", 1.700", 0.060". There is no question about what you are saying. Thank you.

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Thank you Tech, that is just the Electronics Engineer in me.

Ok, so a new update on the progress. I have decided to go extreme on this, so Hemi Hot Heads aluminum heads are in order. I would already have them, but I am building a shop at home, so money has been diverted to that project. I have gotten the rods and pistons though, so just need to sent it off for balancing and then get assembling the lower end.

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I asked Dave to let me road test his aluminum heads on the Hemi in the 37 when they come in.......he said NO (didn't even spend any time mulling it over)



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Nice to see you posting again and although it's probably bothering you the hemi isn't getting done, that building will be sweet! Hotheads aluminum heads, I'm definitely jealous. Someday mine will have them with a blower on top of them just because.

Ok, I decided to move the Hemi project ahead a bit. I honed the block and lifter bores, washed it, and started some assy. I need to get the rotating assy sent out to get balanced, I just keep forgetting to call for it to be picked up. Talk about service, huh...