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Forum: Hot Heads Tech Talk

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on: Thu 01 of Jan, 1970 [00:00 UTC] reads:

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ron37
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Hemi Valve Cover Spacers
on: Tue 11 of Jan, 2022 [21:24 UTC] score: 0.00
I am dealing with a couple 1957 D500 engines. I have the regular valve covers with the rocker arm humps for adjustable rockers. I also have chrome 1953 and 54 style Red Ram and 1956 and 57 Super Red Ram valve cover sets . Some of these are chrome. Do you know of anyone selling valve cover spacers to use these non hump type covers on adjustable rocker engines? If I can't find any then I'll have to press humps in some and get them chromed or try to make some spacers. I have been told that if I try to press humps in my already chrome ones, it will crack the chrome. I also have some Desoto engines that I'm converting to adjustable rockers, so I'll need some for them also. On sparkplug tubes, I'll just lengthen them. Any help is appreciated.

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MRW1994
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331 Hemi Coolant in Oil
on: Fri 31 of Dec, 2021 [17:10 UTC] score: 0.00
I've just completed building my 1955 331 hemi and have been running it to break in the solid lifter cam. It's only been run for a combined time of maybe twenty minutes due to having to shut it down to reseal the bottom four bolts on the exhaust manifolds that started seeping coolant once it started getting hot. After running it yesterday for about ten minutes and it getting to operating temperature I shut it down again after noticing steam and a good bit of water vapor coming out of the breather. I checked the oil and found that at least a couple of quarts of coolant made it to the crankcase. I was wondering where I should start looking first for the leak. The head gaskets are brand new Fel-Pro. Could I have installed them upside down and caused this? Also the block was in pretty rough shape from years of sitting outside. The machine shop sleeved one cylinder and also drilled and tapped a hole in the bottom of the block where there was some pitting coming through from the water jacket. It's a 3/8 pipe plug about 1/8" from a cylinder. Aside from the leak the engine runs great. No white smoke and no misses. If there's anything else I should look for I'd appreciate some guidance. Hope everyone has a happy New Year. Thanks!

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Tomtom
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Help on serial numbers
on: Fri 24 of Dec, 2021 [00:34 UTC] score: 0.00
Need help I just ran across 2 early Hemi motors going keep the best one and pass the other one on to some one . The first motor numbers are D551-3867 and the second one is L8D6-18799 any help is appreciated becuase this is my first Hemi motors and know very little about the 1950's Hemi


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Tomtom
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Re: Help on serial numbers
on: Sat 25 of Dec, 2021 [02:27 UTC] score: 0.00
> Need help I just ran across 2 early Hemi motors going keep the best one and pass the other one on to some one . The first motor numbers are D551-3867 and the second one is L8D6-18799 any help is appreciated becuase this is my first Hemi motors and know very little about the 1950's Hemi
>

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ron37
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Re: Help on serial numbers
on: Fri 24 of Dec, 2021 [01:53 UTC] score: 0.00
Okay after numerous tries, I finally got on line to you. Your L8D6 is a 1958 315 cubic inch hemi. The L = 1958, 8 = 8 cylinder, D = conventional and 600 = 600 series truck. The 18799 is the serial number of the engine.
The D551 is a 270 cubic inch from a 1955 Dodge Coronet and Royal models. It was a poly engine, but if it has hemi heads, then someone put hemi heads on it. Hope this helps.

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Will68
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REAR ENGINE MOUNTINGS ON 331 EXTENDED BELL ENGINE
on: Thu 09 of Sep, 2021 [19:35 UTC] score: 0.00
Can anyone tell me please how the rear of an extended block Chrysler 331 was mounted in a chassis ? I am mounting this engine in a "special" (1953 date) and cannot see any lugs or any other way of mounting the rear of the engine - other than making up some sort of fabrication. The front of the engine has the normal 331 lugs to put mountings on but there is nothing at the back. Were these engines only mounted at the back of the gearbox ? If so I would have thought that it would put a huge strain on the gearbox/engine flange due to the weight involved.
I have searched the web but can only find pictures of the front not the back. !
Any help much appreciated.
Thank you.

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Webmaster2
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Re: REAR ENGINE MOUNTINGS ON 331 EXTENDED BELL ENGINE
on: Thu 23 of Sep, 2021 [10:20 UTC] score: 0.00
The rear motor mount is on the tail shaft.

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ron37
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315 Hemi Pistons
on: Tue 31 of Aug, 2021 [16:26 UTC] score: 0.00
Weird thing happened. A guy got a 315 hemi that was from a running car years ago. He has finally got around to that project. He disassembled the engine and realized the pistons had offset valve notches, which means they were for a poly engine. How is it possible for a hemi to run these without the valves hitting the pistons? He said the engine was a car, not a truck.

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30redram
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Re: 315 Hemi Pistons
on: Tue 07 of Sep, 2021 [03:54 UTC] score: 0.00
> Back in 1963 my Dad took a 241 hemi and bored it out .125 and installed used 259 poly pistons from a 55 Plymouth. We did not have any interference problems; however, we were using a stock cam.

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garyw
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no oil to lifters
on: Sat 31 of Jul, 2021 [21:56 UTC] score: 0.00
tore down my 54 331 hemi put a new distribor in, oil pan head gaskets, manifold gaskets timing cover gaskets. started my engine up and i have 60 lbs pressure on the gauge but it seems like there is no oil on the lifters and no oil on the heads with the valve covers off. it was running fine till i reworked it the cam looked great lifters looked fine no scares or burnt marks I need some help. !!!!!!!!!!!!!!

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George
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Re: no oil to lifters
on: Sat 14 of Aug, 2021 [16:29 UTC] score: 0.00
The hemis don't have huge oil up there compared to modern engines. So it may be oiling. Oil goes up a hole in the block/head/rocker stand. Next to the end stand, 1st one in from the end. Don't remember if head gasket is drilled to have the hole in right place if you put it on upside down.

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garyw
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Re: no oil to lifters
on: Sat 31 of Jul, 2021 [21:57 UTC] score: 0.00
> tore down my 54 331 hemi put a new distribor in, oil pan head gaskets, manifold gaskets timing cover gaskets. started my engine up and i have 60 lbs pressure on the gauge but it seems like there is no oil on the lifters and no oil on the heads with the valve covers off. it was running fine till i reworked it the cam looked great lifters looked fine no scares or burnt marks I need some help. !!!!!!!!!!!!!!

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ron37
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270 hemi pistons
on: Mon 03 of May, 2021 [19:38 UTC] score: 0.00
I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

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George
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Re: 270 hemi pistons
on: Sat 14 of Aug, 2021 [16:38 UTC] score: 0.00
depending on year the 270 was advertised @ 7.6 or 8:1, the 315 is advertised @ 8:1. Advertised is sometimes optimistic, especially on the low decks. Keep in mind the 315 is 8:1 with a longer stroke. You'd need to get down to serious measuring and calculating with the formulas to figure it out

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30redram
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Re: 270 hemi pistons
on: Wed 26 of May, 2021 [05:00 UTC] score: 0.00
> I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

After checking with my 1959 MOTORS manual, it appears the 270 and 315 have different wrist pin diameters. The 270 is .8592 and the 315 is .9216. Unless the small end of the rods can be re-sized to the 315 wrist pin diameter, it does not appear the 315 pistons can be used with stock 270 rods.

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30redram
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Re: 270 hemi pistons
on: Wed 19 of May, 2021 [04:06 UTC] score: 0.00
> I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

I have no hands-on experience with the 315, but I'll offer an idea on some checking you might consider. Take one of the 270 pistons and one of the 315 pistons, remove the wrist pin from one, slide the other piston's wrist pin half way out, then slide the first piston onto the second's wrist pin. Look at the piston tops and see if the 315 top is higher then the 270. If they are the same, there will be no change in the compression ratio. If the 315 is higher, there will be an increase in compression ratio. If it is higher, and you carefully measure the difference with a depth micrometer, plus use some careful math calculations, you can calculate the increase.

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392PT50
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Head stud torque for aluminum heads
on: Sat 24 of Apr, 2021 [17:08 UTC] score: 0.00
Can anyone tell me the torque spec for Hot Heads aluminum heads with aluminum stands?

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Webmaster
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Re: Head stud torque for aluminum heads
on: Mon 26 of Apr, 2021 [19:21 UTC] score: 0.00
> Can anyone tell me the torque spec for Hot Heads aluminum heads with aluminum stands?
I use 100 ft.lb., have fun, Bob

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murbas
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331 hemi with backfiring problems
on: Sun 28 of Mar, 2021 [04:13 UTC] score: 0.00
i have a 331 hemi bored .040 over with 9 to 1 compression ratio, cam is an isky .485 lift 232 duration, 108 degree seperation, with dual holley 450cfm 4bbl's . headers are fenderwell exit with 3" collectors and baffles. car has a street/strip turbo 400 with a 3000 stall converter and 4.11 posi rear with 30" tall tires. i get backfiring occurring on ocasion under hard acceleration. can any help me with this problem ?

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Webmaster
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Re: 331 hemi with backfiring problems
on: Wed 07 of Apr, 2021 [17:42 UTC] score: 0.00
Murbas: Sounds like you're running too fat. According to the calculations I use, your 338 at 6,000 rpm will wants 587 cfm. Try a smaller carb and see if that fixes it. Have fun, Bob






> i have a 331 hemi bored .040 over with 9 to 1 compression ratio, cam is an isky .485 lift 232 duration, 108 degree seperation, with dual holley 450cfm 4bbl's . headers are fenderwell exit with 3" collectors and baffles. car has a street/strip turbo 400 with a 3000 stall converter and 4.11 posi rear with 30" tall tires. i get backfiring occurring on ocasion under hard acceleration. can any help me with this problem ?


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