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Re: Big Block or Gen III Hemi?
[Re: cagebob1]
#954182
03/22/11 11:31 AM
03/22/11 11:31 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
That's the type of feedback I was looking for. I've always been a N/A big block guy, but I think it's time to embrace the new technology
I boosted a very mild 440 w/ an old SN-2000 Paxton and dropped my et by a full second and picked up 10mph on only 6psi of boost. It had zero effects on drivabilty (is that a word) and probably would have done better w/ less gear (3.73 vs. the 3.91's) If the motor in this goes south it will get 8.8:1 pistons and 8-10lbs of boost. It was like having a 100-150 shoot ALL the time.
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Re: Big Block or Gen III Hemi?
[Re: Mr.Yuck]
#954183
03/22/11 06:21 PM
03/22/11 06:21 PM
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Joined: Dec 2006
Posts: 240
Shingle Springs Ca
haddixj
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 240
Shingle Springs Ca
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if your doing a Rx7 why not put an LS based motor in it? its been done and a proven combo. Not to say the gen III isnt good but if your starting from square 1 go with the LS, people making that HP easy on stock blocks and some cranks. FWIW I have a 70 duster tube chassis car and my new motor is a 582 BBC dart block BMF heads I am at 10K OTD dynoed. I priced out the mopar stuff B1 heads are like 7k a short block is 7k just adds up and wont be as much HP for the dollar. All that said a gen II hemi would be the most eye catching.
ohh and what year is the RX7? If its 93+ check out hinson cars they make all the stuff to put the LS in without tube chassis
70 duster 25.1E,73 barracuda, 70 gran coupe, 71 cuda
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Re: Big Block or Gen III Hemi?
[Re: haddixj]
#954187
03/22/11 09:16 PM
03/22/11 09:16 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
if your doing a Rx7 why not put an LS based motor in it? its been done and a proven combo. Not to say the gen III isnt good but if your starting from square 1 go with the LS, people making that HP easy on stock blocks and some cranks. FWIW I have a 70 duster tube chassis car and my new motor is a 582 BBC dart block BMF heads I am at 10K OTD dynoed. I priced out the mopar stuff B1 heads are like 7k a short block is 7k just adds up and wont be as much HP for the dollar. All that said a gen II hemi would be the most eye catching.
ohh and what year is the RX7? If its 93+ check out hinson cars they make all the stuff to put the LS in without tube chassis
might as well hang a chevy II shell on it and call it a day.
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Re: Big Block or Gen III Hemi?
[Re: cagebob1]
#954188
03/23/11 07:44 AM
03/23/11 07:44 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Chryco - Isn't a Gen II Hemi really expensive?
not really any more expensive than a wedge once you start talking aftermarket blocks/cranks/heads...rocker gear is about the only thing more expensive at that point because you're buying 2x the components
for a light small car like the RX7, I think I'd be inclined to a genIII hemi...
Last edited by patrick; 03/23/11 07:47 AM.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Big Block or Gen III Hemi?
[Re: haddixj]
#954189
03/23/11 09:06 AM
03/23/11 09:06 AM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
if your doing a Rx7 why not put an LS based motor in it? its been done and a proven combo. Not to say the gen III isnt good but if your starting from square 1 go with the LS, people making that HP easy on stock blocks and some cranks. FWIW I have a 70 duster tube chassis car and my new motor is a 582 BBC dart block BMF heads I am at 10K OTD dynoed. I priced out the mopar stuff B1 heads are like 7k a short block is 7k just adds up and wont be as much HP for the dollar. All that said a gen II hemi would be the most eye catching.
ohh and what year is the RX7? If its 93+ check out hinson cars they make all the stuff to put the LS in without tube chassis
THe power he is looking to make even the Ls guys don't run that much power through a stock block. Must from what i seen you the LQ truck block "cast iron" but then upgrade"the smart ones" to the LSX Block around the 600HP mark. I know the stock "ported" G3 Hemi heads were able to make 700HP from N/A and the new 6.4L heads are even better still however the block is another question as i am not sure how much they can handle but Mopar does have a ALum race block for the 3rd G hemi
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Re: Big Block or Gen III Hemi?
[Re: Racer426]
#954192
04/04/11 12:01 AM
04/04/11 12:01 AM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
Posts: 833
MN
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I vote for the Gen III Hemi. While freshening up our Gen II Hemi in the 64 Lightweight we decided to weigh it. The old iron headed girl weighed in at 720 lbs. When we pulled the Gen III Hemi out of our 09 Challenger Drag Pak and weighed it. She came in at a whooping 460 lbs! And the all aluminum Gen III Hemi race blocks are reported to weigh 90 lbs lighter. 370 lbs for an engine that we can make almost as much or more hp/tq as the Gen II Hemi fat girl. If the old race Hemi ever decides to give up the ghost, a Gen III Hemi will take its place.
Last edited by hemidup; 04/04/11 12:02 AM.
Jerry Williams.
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