Re: Poly / Hemi Build
[Re: Mike P]
#3025848
03/20/22 08:34 PM
03/20/22 08:34 PM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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The heads aren’t back yet but I got the front cover and pan on this week and I got the balancer taken care of. There are a few options for bolt-on balancers available for the early HEMI. The “stock replacement” balancer that Hot Heads sells is not currently available. These were off the shelf 318/340 balancers for the internally balanced small blocks. They had a new keyway cut for the larger key the HEMI crankshaft uses and are indexed so the timing marks lined up with the timing pointer on the Hot Heads timing cover. Even if they had been available it was still cheaper to have the machine shop cut the new keyway in the balancer I bought. MB by M Patterson, on Flickr I decided to build my own accessory brackets for this engine. Nothing against the aluminum brackets that Hot Heads sells but they are a little gaudy for how I want this engine to look. Saving a few bucks is always a plus too so this is pretty much a win win. For the Power Steering Pump I just duplicated the brackets I had previously made for the 57 Plymouth. It’s basically a slightly modified SB Chevy Saginaw bracket and a couple of braces to hold the pump solid. HP1 by M Patterson, on Flickr HP3 by M Patterson, on Flickr PSI by M Patterson, on Flickr The alternator bracket is pretty easy to do. On my pervious 2 HEMIs I modified a 69-82 SB Chevy Truck/Corvette bracket. SBPS by M Patterson, on Flickr I actually have a spare bracket I’d previously modified laying around. I’d also picked up a different bracket for a 69-71 Chevy truck with AC a while back and decided to modified that one too (which entailed nothing more than elongating the mounting holes and grinding a small clearance notch). I’m not sure which one I’ll be using yet, the 69-71 bracket moves the alternator out and up a bit which may be helpful with the 6 pack air cleaner. AB by M Patterson, on Flickr I got some of the pieces for the AC compressor bracket rough cut but can’t really do much with that until I get the heads and water crossover are on the engine. So back to staring at the short block and waiting on parts. LOL
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: earlymopar]
#3025951
03/21/22 09:05 AM
03/21/22 09:05 AM
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Joined: Aug 2007
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Mike P
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Good catch. You're correct the PS pump is stationary. I failed to mention the belt for the PS pump also drives the water pump and alternator. The alternator will be the tensioner for that belt. Here's the same setup on my 57 Plymouth. HP4 by M Patterson, on Flickr
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: earlymopar]
#3026215
03/21/22 10:31 PM
03/21/22 10:31 PM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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Something I forgot to post is that as the HEMI and Poly blocks are the same, the information I posted about the oil pans, windage trays, timing cover, water pump conversion, balancer,and pulleys apply whether it's a 301/331/354 HEMI or Poly engine.
Also as far as the brackets I'm building (or the ones Hot Heads sells) they should also interchange between Poly and HEMI motors. The power steering pump bracket mounts to the timing cover and the alternator bracket uses the water crossover bolts to retain it. The AC bracket that I'm building will use 2 manifold bolts and the water crossover bolts on the passenger side.
Even the intake manifold interchanges between the 2 engines.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: Mike P]
#3027834
03/26/22 06:45 PM
03/26/22 06:45 PM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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Aaahhhh…..what could have been. LOL WCB 1 by M Patterson, on Flickr I got the flywheel and bellhousing on this week so I could move the short-block over to the run stand for final assembly. Still waiting on the heads so I figured I’d go ahead and throw the Poly heads on and finish up the brackets. I couldn’t resist digging out the old Tri-Power just to see how it would have looked. Spent entirely too much time staring at it LOL. I finally took the Tri-Power off and installed the Hot Heads intake and went ahead and built the AC Compressor brackets. I duplicated the PAW AC bracket I’m using on the 57 Plymouth. The design is pretty simple, just a bit of work getting everything lined up with the bolt holes before welding it together. I had enough material left over I ended up making 2 sets (just in case I ever do come across a buildable Spitfire). I only did one set of spacers as they are unique to whatever manifold I use. AC B by M Patterson, on Flickr So that pretty much wraps up the accessories. The more I study the Poly the more impressed I am with what Chrysler did. They designed a completely new head but with the exception of the pistons everything in the short-block is the same between the Poly and HEMI. They incorporated design features that allowed all external parts (with the exception of the exhaust manifolds) to interchange between the HEMI and POLY. Basically pretty much anything you can bolt to a HEMI will also fit a Poly. ACB by M Patterson, on Flickr .
Last edited by Mike P; 03/27/22 07:22 PM.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: moparx]
#3030366
04/03/22 06:59 PM
04/03/22 06:59 PM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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The heads got done last week. TNH by M Patterson, on Flickr As I posted earlier one was pretty badly pitted from sitting in a car trunk for at least 40 years. It took milling .040 off to clean it up. It’s actually not as much as it sounds though as when the factory put it together they used a steel shim head gasket with a compressed thickness of .024. The FelPro head gaskets I’m using are between .041 and .047 (depending on which reference you believe) so from a compression standpoint it’s effectively only about a .020 cut. The rest was pretty straight forward. New stainless valves, stock 1 ¾” exhaust and we stepped up the intake to 2” (from the stock 1 15/16”). They also got new springs, keepers and locks. The only thing that was really added are the lower spark plug tube seals. I’m running the same heads on the 331 in the 37 Dodge truck and any time you pull a plug it ends up coating the tip in oil (makes it awful hard to take a plug reading) and then it smokes like a train when you start it because of all the oil in the cylinders. It’s funny the 354 in the Plymouth doesn’t seem to have that problem. Anyway the heads are on, pushrods adjusted and the oil system primed. With any luck I may here it run sometime this week. .
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: Mike P]
#3032340
04/10/22 01:47 PM
04/10/22 01:47 PM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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Well it’s alive……Really wasn’t planning on it taking 3 ½ years but life happens. CVC by M Patterson, on Flickr I still want to build a Poly at some point and I might have a line on a 57 354 Spitfire but I’ll have to wait and see what pans out. I’d sent out a pair of stock valve cover and 6 pack air cleaner lid to be powder coated and even got my granddaughter to paint the lettering on the valve covers. They’re not perfect but I figure getting my teenage Granddaughter to even come out to the shop and not having her off her phone is still a win. For now though I decided to use the finned aluminum valve covers that I’d had on the 57 Plymouth. SVC by M Patterson, on Flickr Overall I’m happy having another HEMI. Last week was filled with the little aggravations that can sometimes plague a project. It wasn’t so much the engine itself, which went together nicely. A lot of it was things associated with the run stand. Seems like when I moved it to the back shed a few years ago I didn’t figure I’d ever have another engine on it so I had ended up stripping almost all the wiring for the Chrysler Electronic ignition off of it. The fuel pump had gone bad along with the radiator cap (that didn’t show up till the engine got to 190 degrees when I was doing the cam break-in). That was all in addition to some minor carburetor issues. Over all the cam break-in went well in spite of everything. I did have a couple of timing cover bolts that leaked coolant, naturally one was behind the water pump that I couldn’t get to without pulling the pump but it wasn’t horribly painful…..just aggravating. I’ts a little more cam than I normally select for a street engine but I do like the way it sounds. https://youtu.be/sg3Ns4OV3w0I still have some dialing in to do, and also a brace to build for the air cleaner, but I’m pretty happy with how it turned out. .
Last edited by Mike P; 04/10/22 01:51 PM.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: Mike P]
#3049941
06/12/22 02:31 PM
06/12/22 02:31 PM
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Joined: Aug 2003
Posts: 43,129 Bend,OR USA
Cab_Burge
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How are you liking the weight of those early hemi heads? I cut my teeth on making HP on a 1955 New Yorker 331 hemi motor in a 1933 Ford Pickup that had the cab chopped and channel with a very short hand made sheet metal bed That truck broke a lot of parts (mainly the early ford enclosed drive train ) and whup on a lot of "modern muscle cars" back in the md 1960 As far as filling the spark plug holes in the heads you need to run it long enough for oil to splash in them to fill them, those Milidon sela may help some but the early heads where cast in those heads and the Mildon plug seals need a smooth surface for the O rings to seal up well against, not a real course cast surface Looking good, I hope it runs as well as it looks
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Poly / Hemi Build
[Re: Cab_Burge]
#3050107
06/13/22 09:23 AM
06/13/22 09:23 AM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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“…..How are you liking the weight of those early hemi heads?......” Just hoping I’m never in a situation where I ever have to pull one or both heads off “in car”. Of course some of the OE cast iron intakes also weigh within a few pounds of the heads so it's a pretty good workout…..I suspect that’s a job I would farm out to my Grandson LOL. “…..As far as filling the spark plug holes in the heads you need to run it long enough for oil to splash in them to fill them, those Milidon sela may help some but the early heads where cast in those heads and the Mildon plug seals need a smooth surface for the O rings to seal up well against, not a real course cast surface…..” Yup your right, and the lower tube seals only have an O ring on the inside and there is no provisions on the seals for an O ring on the outside The tube seals I used are just a bit larger than the factory plug wells and require the top of the plug well to be slightly milled for them to fit (a which also provides a smooth finish). Just to be sure when we installed the seals we used a bit a Green Locktite sealer. tube seals by M Patterson, on Flickr I’m currently catching up on some other jobs around here but when I get a little time there are a couple things I want to address on the HEMI. I do have a slight oil leak from the valley pan and with the intake on I can’t get to the bolts. Pulling the intake off is in the cards anyway. After I got the engine together I read that the Holley Sniper system I’m thinking about installing has some issues when used with a dual plane intake with a plenum divider. The band-aid is a 1” open spacer and the cures are either finding a single plane intake or partially milling the divider. So when I do get around to addressing oil leak the intake will get a bit of work.
Last edited by Mike P; 06/13/22 09:37 AM.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: Poly / Hemi Build
[Re: Mike P]
#3052239
06/21/22 07:58 PM
06/21/22 07:58 PM
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Joined: Aug 2003
Posts: 43,129 Bend,OR USA
Cab_Burge
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How about buying and using a stock 2x4 singl e plane intake with dual throttle bodies? I did that for a local customer on a KB aluminum 426 Street Hemi with stage V heads and his single plane in line dual four-barrel intake, that work very well
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Poly / Hemi Build
[Re: Cab_Burge]
#3052315
06/22/22 06:21 AM
06/22/22 06:21 AM
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Joined: Aug 2007
Posts: 1,510 AZ
Mike P
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“….. How about buying and using a stock 2x4 single plane intake with dual throttle bodies? …..”
I looked at that type of setup briefly. This will be my first foray into standalone aftermarket injection so I’m leaning towards something simple and well supported……and I admit cost is also a factor.
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1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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