4" stroke 6" rod in a 400 block?
10-14-2004, 10:53 AM
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Car: '85 Camaro
Engine: LG4 305
Transmission: T-5
4" stroke 6" rod in a 400 block?
I've heard it can be done, but I haven't heard what is required to do it.
What kind of machine work to the block is required?
Is this one of those situations where you have to go with a different cam diameter?
Can you do it with H-beams?
Can you do it with a static compression of 8.5:1 or lower (wanna go Supercharged)?
Thanks,
Jason
What kind of machine work to the block is required?
Is this one of those situations where you have to go with a different cam diameter?
Can you do it with H-beams?
Can you do it with a static compression of 8.5:1 or lower (wanna go Supercharged)?
Thanks,
Jason
10-14-2004, 11:20 AM
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
It will require pistons with a 1" compression height. Good luck with that. It will be almost impossible to do and won't last a week on the street.
10-14-2004, 11:29 AM
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Car: '85 Camaro
Engine: LG4 305
Transmission: T-5
What should be changed in this setup?
The objective was to reduce the side thrust loads (?) and increase the stroke. If I have to give up one or the other (or lower levels of both) what would be recommended?
Thanks,
Jason
The objective was to reduce the side thrust loads (?) and increase the stroke. If I have to give up one or the other (or lower levels of both) what would be recommended?
Thanks,
Jason
10-14-2004, 11:46 AM
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Use a shorter rod, about the max you can go is 5.85" rod. Even that is pushing it. If you really want to build a 6" rod 4" stroke engine you need a tall deck block. They are .300" taller.
10-14-2004, 12:19 PM
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Car: '85 IROC
Engine: LB9
Transmission: 700 R4
There's one that's .5" taller too.
Those tall deck blocks also have the pan rails spread apart for additional clearance there, and the cam is raised up for clearance.
All SBC builders should aspire to have one.
http://www.dartheads.com/csbiron.htm
Those tall deck blocks also have the pan rails spread apart for additional clearance there, and the cam is raised up for clearance.
All SBC builders should aspire to have one.
http://www.dartheads.com/csbiron.htm
10-14-2004, 06:18 PM
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Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
it still comes down to return vs overhead
I would not try it with a factory block. Dart highdeck.
The tall deck dart 454 smallblock hotrod did (dec 2003) made 584ft/lbs at 4100 and 536hp at 5700 with the comp XE294 hydroller. Be prepared to spend close to 2K on a good head.
These are some good deals
http://cgi.ebay.com/ebaymotors/ws/eB...927960164&rd=1
http://cgi.ebay.com/ebaymotors/ws/eB...927960143&rd=1
The tall deck dart 454 smallblock hotrod did (dec 2003) made 584ft/lbs at 4100 and 536hp at 5700 with the comp XE294 hydroller. Be prepared to spend close to 2K on a good head.
These are some good deals
http://cgi.ebay.com/ebaymotors/ws/eB...927960164&rd=1
http://cgi.ebay.com/ebaymotors/ws/eB...927960143&rd=1
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