How did the early hemis survive the HP?

Belvedere II · 05-11-2015, 01:24 PM

The 354s and 392s apparently had 2-bolt main caps, so how did their cranks survive the power produced via blowers and fuels of the 60's? Were they machined for 4-bolt caps, girdles, or something else?

ozymaxwedge · 05-12-2015, 01:47 AM

I would say that back in the day the early blown nitro 392 hemi's were all around the 700-1200 hp mark ?? So they survived but lots let go as well just like a stock block 440 at 1000 hp is today, it will hang together for this ????? long.

FWIW,
I have a cast crank 440 that has well over 150 nitrous passes on it, it has 2 sleeves, 7 trw pistons, 1 manley piston that I shaped myself, ran a best of 9.69 and will not die, I think its a crossed fingers thing

James L Miller · 05-18-2015, 11:27 PM

I don't know the HP, but this is one of my favorite photos of drag racing. I think they said this was on hydrazine, not sure but that would make sense.

FED 387 · 05-19-2015, 12:04 AM

some racers used 4 bolt mains many variations here some were splayed while others were not--- some used a combination of 4 bolt mains & a stud girdle--- others used just a stud girdle lots of variations in the design of the girdles---- lots of variations of mains/girdles etc to get them to live---FED 387

Charlie A · 05-19-2015, 01:01 PM

Quote:

Originally Posted by James L Miller

I don't know the HP, but this is one of my favorite photos of drag racing. I think they said this was on hydrazine, not sure but that would make sense.

One of the best blown engine pics ever.
Have to wonder what he was "really" thinking as he is looking down at his lower body! lol

Charlie A · 05-19-2015, 01:04 PM

Best exploded transmission picture:

05-11-2015, 01:24 PM	#1
Belvedere II Junior Member Join Date: Dec 2010 Posts: 6 Likes: 0 Liked 0 Times in 0 Posts	How did the early hemis survive the HP? The 354s and 392s apparently had 2-bolt main caps, so how did their cranks survive the power produced via blowers and fuels of the 60's? Were they machined for 4-bolt caps, girdles, or something else?

05-12-2015, 01:47 AM	#2
ozymaxwedge Junior Member Join Date: Apr 2013 Posts: 9 Likes: 0 Liked 0 Times in 0 Posts	Re: How did the early hemis survive the HP? I would say that back in the day the early blown nitro 392 hemi's were all around the 700-1200 hp mark ?? So they survived but lots let go as well just like a stock block 440 at 1000 hp is today, it will hang together for this ????? long. FWIW, I have a cast crank 440 that has well over 150 nitrous passes on it, it has 2 sleeves, 7 trw pistons, 1 manley piston that I shaped myself, ran a best of 9.69 and will not die, I think its a crossed fingers thing

05-18-2015, 11:27 PM	#3
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	Re: How did the early hemis survive the HP? I don't know the HP, but this is one of my favorite photos of drag racing. I think they said this was on hydrazine, not sure but that would make sense. Attached Thumbnails __________________ Mopar 2 Ya!

05-19-2015, 12:04 AM	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,419 Likes: 528 Liked 332 Times in 180 Posts	Re: How did the early hemis survive the HP? some racers used 4 bolt mains many variations here some were splayed while others were not--- some used a combination of 4 bolt mains & a stud girdle--- others used just a stud girdle lots of variations in the design of the girdles---- lots of variations of mains/girdles etc to get them to live---FED 387

05-19-2015, 01:04 PM	#6
Charlie A VIP Member Join Date: Sep 2010 Location: Mississippi Gulf Coast Posts: 2,483 Likes: 68 Liked 87 Times in 63 Posts	Re: How did the early hemis survive the HP? Best exploded transmission picture: