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Max stroke in an iron Hemi Megablock #3177528
09/23/23 05:13 PM
09/23/23 05:13 PM
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Minnesota
Hemi_Joel Offline OP
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Hi, I have an early iron Hemi mega block with standard cam/crank distance, and a nice Velasco billet 4.5 crank with 2.375" rod journals. The crank has 1" lightening holes thru the rod journals, offset towards the outside so the wall thickness is .325 on the outside and 1.050" thick on the inside. I want to grind the journals down to 2.200". If i regrind and maintain the same stroke, the minimum wall thickness on the rod journals with be reduced to .238". Is that thick enuff? I could add .170 to the stroke by offset grinding, and maintain the existing minimum wall thickness. Is there anything wrong with going 4.670 stroke? Will steel rods clear the cam lobes OK at that stroke?

Thanks, Joel


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: Hemi_Joel] #3177552
09/23/23 07:12 PM
09/23/23 07:12 PM
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nielsville, minn.
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quickd100 Offline
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Is that the block I sold you Joel? With a 2 2 pin I had no trouble going to 4.75" I had real close clearance with 4 cam lobes, .060. Other than that I still think 4-7/8" would clear. The raised cam block is good for 5".

Re: Max stroke in an iron Hemi Megablock [Re: quickd100] #3177556
09/23/23 07:27 PM
09/23/23 07:27 PM
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Minnesota
Hemi_Joel Offline OP
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Dave, thanks for the info, that helps. This is a different block. The one I got from you got hurt, then I unfortunately the crooked machine shop I sent it to for repairs stole it from me.


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: Hemi_Joel] #3177569
09/23/23 07:51 PM
09/23/23 07:51 PM
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nielsville, minn.
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quickd100 Offline
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Sorry to hear that Joel. Darn blocks have gotten crazy expensive too.

Re: Max stroke in an iron Hemi Megablock [Re: quickd100] #3178057
09/25/23 12:49 PM
09/25/23 12:49 PM
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JERICOGTX Offline
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Sell it, and buy an aluminum block...


69 GTX 68 Road Runner
Re: Max stroke in an iron Hemi Megablock [Re: JERICOGTX] #3178068
09/25/23 01:03 PM
09/25/23 01:03 PM
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central il.
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second 70 Offline
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Originally Posted by JERICOGTX
Sell it, and buy an aluminum block...


And today another episode of of Jeff trying to pry open Joel's wallet. Jeff I think he's on a budget due to all the steak dinners he's going to owe you. lol

Re: Max stroke in an iron Hemi Megablock [Re: second 70] #3178071
09/25/23 01:07 PM
09/25/23 01:07 PM
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JERICOGTX Offline
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Originally Posted by second 70
Originally Posted by JERICOGTX
Sell it, and buy an aluminum block...


And today another episode of of Jeff trying to pry open Joel's wallet. Jeff I think he's on a budget due to all the steak dinners he's going to owe you. lol


Well my truck is down after this last weekend, so it looks like my race season is done... No steak dinner from Joel this year...


69 GTX 68 Road Runner
Re: Max stroke in an iron Hemi Megablock [Re: JERICOGTX] #3178074
09/25/23 01:09 PM
09/25/23 01:09 PM
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Minnesota
Hemi_Joel Offline OP
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Originally Posted by JERICOGTX
Originally Posted by second 70
Originally Posted by JERICOGTX
Sell it, and buy an aluminum block...


And today another episode of of Jeff trying to pry open Joel's wallet. Jeff I think he's on a budget due to all the steak dinners he's going to owe you. lol


Well my truck is down after this last weekend, so it looks like my race season is done... No steak dinner from Joel this year...



No excuses. Get it fixed or borrow My truck or Mike's truck. I already put Texas Roadhouse gift cards on my Christmas wish list from my kids.


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: JERICOGTX] #3178077
09/25/23 01:12 PM
09/25/23 01:12 PM
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Posts: 7,503
Minnesota
Hemi_Joel Offline OP
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Originally Posted by JERICOGTX
Sell it, and buy an aluminum block...


An inquiry has been made into the aluminum block weight ,price, availability. It's kind of hard not to use block that I have sitting here, all machined and ready to go. But then I need heed the advice I have given to others: just because you have something on hand doesn't mean you should use it. You can always sell it and use the funds to get something more suitable for the project.
Edit: the problem with that is I can never bring myself to sell Hemi stuff. So I wouldn't have the funds from selling the iron block, I'd be out the full cost of the aluminum block if I go that route.

Last edited by Hemi_Joel; 09/25/23 01:47 PM.

[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: Hemi_Joel] #3178099
09/25/23 01:54 PM
09/25/23 01:54 PM
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JERICOGTX Offline
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Originally Posted by Hemi_Joel
Originally Posted by JERICOGTX
Sell it, and buy an aluminum block...


An inquiry has been made into the aluminum block weight ,price, availability. It's kind of hard not to use block that I have sitting here, all machined and ready to go. But then I need heed the advice I have given to others: just because you have something on hand doesn't mean you should use it. You can always sell it and use the funds to get something more suitable for the project.
Edit: the problem with that is I can never bring myself to sell Hemi stuff. So I wouldn't have the funds from selling the iron block, I'd be out the full cost of the aluminum block if I go that route.


You've always been weight conscience with the Coupe before, why stop now? You'll always wish you dropped that 150lbs.


69 GTX 68 Road Runner
Re: Max stroke in an iron Hemi Megablock [Re: quickd100] #3178155
09/25/23 05:11 PM
09/25/23 05:11 PM
Joined: May 2004
Posts: 12,434
Taxes & Virus's R-US, NY
Dragula Offline
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Originally Posted by quickd100
Is that the block I sold you Joel? With a 2 2 pin I had no trouble going to 4.75" I had real close clearance with 4 cam lobes, .060. Other than that I still think 4-7/8" would clear. The raised cam block is good for 5".


Ditto....I have two of them...4.75 is it with steal rods for sure.


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Max stroke in an iron Hemi Megablock [Re: JERICOGTX] #3178163
09/25/23 05:51 PM
09/25/23 05:51 PM
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Plymouth, MI
Blusmbl Offline
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Originally Posted by JERICOGTX
You've always been weight conscience with the Coupe before, why stop now? You'll always wish you dropped that 150lbs.


x2. You're building it to race in a specific class at Drag Week, right? It really seems hard to turn that weight reduction down.


'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
Re: Max stroke in an iron Hemi Megablock [Re: Blusmbl] #3178203
09/25/23 07:13 PM
09/25/23 07:13 PM
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NY
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I have a mega block, 4.75 with aluminum rods, GRP

Re: Max stroke in an iron Hemi Megablock [Re: B1duster] #3178262
09/26/23 05:50 AM
09/26/23 05:50 AM
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nielsville, minn.
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quickd100 Offline
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Well Joel I know you're a frugal Scandinavian and I know how to get the weight down on the hotrod. Most people won't do this though, go on a diet, it won't get you all the way there but it's a start. Also start looking for ounces, rifle drill bolts, lighten everything up.

Re: Max stroke in an iron Hemi Megablock [Re: B1duster] #3178270
09/26/23 08:19 AM
09/26/23 08:19 AM
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Taxes & Virus's R-US, NY
Dragula Offline
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Originally Posted by B1duster
I have a mega block, 4.75 with aluminum rods, GRP


Is it raised cam?


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Max stroke in an iron Hemi Megablock [Re: Dragula] #3178288
09/26/23 10:03 AM
09/26/23 10:03 AM
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B1duster Offline
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Not a raised cam block

Re: Max stroke in an iron Hemi Megablock [Re: quickd100] #3178299
09/26/23 10:48 AM
09/26/23 10:48 AM
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Posts: 7,503
Minnesota
Hemi_Joel Offline OP
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Originally Posted by quickd100
Well Joel I know you're a frugal Scandinavian and I know how to get the weight down on the hotrod. Most people won't do this though, go on a diet, it won't get you all the way there but it's a start. Also start looking for ounces, rifle drill bolts, lighten everything up.


Haha Dave I have been dieting for about the last 2 years. I got down 35 lb from my max, but it's hard to maintain. About 15 of it has crept back. So there is potential there.


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: Hemi_Joel] #3178300
09/26/23 10:55 AM
09/26/23 10:55 AM
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Originally Posted by Hemi_Joel
Originally Posted by quickd100
Well Joel I know you're a frugal Scandinavian and I know how to get the weight down on the hotrod. Most people won't do this though, go on a diet, it won't get you all the way there but it's a start. Also start looking for ounces, rifle drill bolts, lighten everything up.


Haha Dave I have been dieting for about the last 2 years. I got down 35 lb from my max, but it's hard to maintain. About 15 of it has crept back. So there is potential there.


Only 15??? rolleyes


69 GTX 68 Road Runner
Re: Max stroke in an iron Hemi Megablock [Re: JERICOGTX] #3178325
09/26/23 11:51 AM
09/26/23 11:51 AM
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Minnesota
Hemi_Joel Offline OP
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Originally Posted by JERICOGTX


Only 15??? rolleyes


Haha, fatso! You'da hit 8's if you'da hit the gym like me. laugh2


[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
Re: Max stroke in an iron Hemi Megablock [Re: Hemi_Joel] #3178340
09/26/23 12:26 PM
09/26/23 12:26 PM
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Originally Posted by Hemi_Joel
Originally Posted by JERICOGTX


Only 15??? rolleyes


Haha, fatso! You'da hit 8's if you'da hit the gym like me. laugh2


You hit the gym??? One would never know.


69 GTX 68 Road Runner






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