Large inch NA build
03-20-2023 | 09:02 PM
#51
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From: St. Pete Beach, FL
I like where this thread has gone! Keep it coming fellas....I'm not currently building engines trying to meet these goals just mainly opened it up for discussion...
Should we clear up some of the acronyms for us stupid people? CH CD etc?
Is the general consensus that you can't get tq and hp up areound 700 with a GM 502 mag block then? In a 540 or 548 configuration? I read through everything and it seems like the hp is "easy" but tq will suffer...did I read that right?
Thanks for all the replies! Turning into a very informative and fun thread I think!
Should we clear up some of the acronyms for us stupid people? CH CD etc?
Is the general consensus that you can't get tq and hp up areound 700 with a GM 502 mag block then? In a 540 or 548 configuration? I read through everything and it seems like the hp is "easy" but tq will suffer...did I read that right?
Thanks for all the replies! Turning into a very informative and fun thread I think!
03-20-2023 | 09:22 PM
#52
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Joined: Mar 2020
Posts: 372
Likes: 182
From: East Tennesseee
Dan,
We’re not actually building an engine. Just dreaming. And collecting info for the engine I WANNA build someday.
The tread started as NA, and I know *I* can’t use a blower on a 565 in my current boat. The 565 is probably all the hull would really want. I can’t speak for anyone else, but I’m asking about NA.
I have no idea about CR. I’m the student here.
Thanks. Brad.
(937)545-8991
We’re not actually building an engine. Just dreaming. And collecting info for the engine I WANNA build someday.
The tread started as NA, and I know *I* can’t use a blower on a 565 in my current boat. The 565 is probably all the hull would really want. I can’t speak for anyone else, but I’m asking about NA.
I have no idea about CR. I’m the student here.
Thanks. Brad.
(937)545-8991
03-21-2023 | 05:28 AM
#53
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Joined: Jul 2017
Posts: 1,740
Likes: 298
From: Sodus MI
Only limit I was initially thinking was using a gm 502 short deck block...if you ran a good iron head on 93 premium what kind of compression ratio could you run? If you punched out to the 540/548 area could you run 10:1? 11:1? and will that remedy some of the torque issues? Just spitballing to get some good updated info out on the boards. I searched the subject before posting this thread and couldn't find much recent info pertaining to the subject other than a few engine build threads.
03-21-2023 | 07:23 AM
#55
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Joined: Mar 2011
Posts: 943
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From: So. Burl. VT.
I have dart short deck blocks, so we went to 565 cu in. 9.3 cr. When we rebuilt the engines for the poker run we updated to RFD's new heads. The only other changes were dry sump oil systems and going from 1 7/8 exhaust to 2 1/8 in.
so by the old rule we should of lost some of our low end torque. If you compare the two dyno sheets you will see we picked up almost 100 lb ft. I can't stress enough this new cylinder head tech is amazing.
so by the old rule we should of lost some of our low end torque. If you compare the two dyno sheets you will see we picked up almost 100 lb ft. I can't stress enough this new cylinder head tech is amazing.
Last edited by KWright; 03-21-2023 at 08:26 AM.
03-21-2023 | 07:46 AM
#58
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From: Dawsonville, GA
03-21-2023 | 08:09 AM
#59
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From: Cape Coral FL
New 548 builds, AK Racing heads - Page 3 - Offshoreonly.com
These were done on stock Gen 6 502 blocks. 699hp, 642tq
These were done on stock Gen 6 502 blocks. 699hp, 642tq
03-21-2023 | 08:36 AM
#60
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Posts: 943
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From: So. Burl. VT.
