Goal = 500 Rear Wheel Hp/ft-pds With Radix.
09-13-2005, 09:53 AM
#1
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Goal = 500 Rear Wheel Hp/ft-pds With Radix.
I'm planning on makeing changes this winter and need to begin acquiring parts.
What will it take engine-wise? I'll be using my Radix on whatever I build.
I'm wondering whether to build a 427 or a 408. I like the bigger cubes but I'm concerned that going 427 may require some really expensive heads in order to feed that big a hole. (By the way... what bore/stroke makes a 427 and 408?)
Is there much difference between the older and newer 6 liter blocks?
Is there a GM Vortech head that would be usable (easy to find and relatively inexpensive) that could be ported to give sufficient flow or will I have to go with expensive aftermarket heads?
I'll be going with long headers (maybe custom made stepped headers if I can get the local genius interested) and Flowmaster 40's...3" all the way.
I'll be backing it up with either an 80 or 85 trans, 410 Strange (or some other really strong rearend) and big axels.
What block, displacement and heads do you recommend? I'll get cam recommendations from the manufactures.
What will it take engine-wise? I'll be using my Radix on whatever I build.
I'm wondering whether to build a 427 or a 408. I like the bigger cubes but I'm concerned that going 427 may require some really expensive heads in order to feed that big a hole. (By the way... what bore/stroke makes a 427 and 408?)
Is there much difference between the older and newer 6 liter blocks?
Is there a GM Vortech head that would be usable (easy to find and relatively inexpensive) that could be ported to give sufficient flow or will I have to go with expensive aftermarket heads?
I'll be going with long headers (maybe custom made stepped headers if I can get the local genius interested) and Flowmaster 40's...3" all the way.
I'll be backing it up with either an 80 or 85 trans, 410 Strange (or some other really strong rearend) and big axels.
What block, displacement and heads do you recommend? I'll get cam recommendations from the manufactures.
09-13-2005, 10:05 AM
#2
Originally Posted by JimS
I'm planning on makeing changes this winter and need to begin acquiring parts.
What will it take engine-wise? I'll be using my Radix on whatever I build.
I'm wondering whether to build a 427 or a 408. I like the bigger cubes but I'm concerned that going 427 may require some really expensive heads in order to feed that big a hole. (By the way... what bore/stroke makes a 427 and 408?)
Is there much difference between the older and newer 6 liter blocks?
Is there a GM Vortech head that would be usable (easy to find and relatively inexpensive) that could be ported to give sufficient flow or will I have to go with expensive aftermarket heads?
I'll be going with long headers (maybe custom made stepped headers if I can get the local genius interested) and Flowmaster 40's...3" all the way.
I'll be backing it up with either an 80 or 85 trans, 410 Strange (or some other really strong rearend) and big axels.
What block, displacement and heads do you recommend? I'll get cam recommendations from the manufactures.
What will it take engine-wise? I'll be using my Radix on whatever I build.
I'm wondering whether to build a 427 or a 408. I like the bigger cubes but I'm concerned that going 427 may require some really expensive heads in order to feed that big a hole. (By the way... what bore/stroke makes a 427 and 408?)
Is there much difference between the older and newer 6 liter blocks?
Is there a GM Vortech head that would be usable (easy to find and relatively inexpensive) that could be ported to give sufficient flow or will I have to go with expensive aftermarket heads?
I'll be going with long headers (maybe custom made stepped headers if I can get the local genius interested) and Flowmaster 40's...3" all the way.
I'll be backing it up with either an 80 or 85 trans, 410 Strange (or some other really strong rearend) and big axels.
What block, displacement and heads do you recommend? I'll get cam recommendations from the manufactures.
whitt1 would be an excellent source of info for you, he has a Radix 402 pumping out 600rwhp.
there was also a guy on SS Silverado board that had a Radix stroker as well.
Hope that gets you started in the right direction. btw, you can do 500/500 with a Radix and a 6.0.
09-13-2005, 11:36 AM
#6
Originally Posted by hellbents10
You can also do about 500rwhp with just a 408 n/a.
check out these NEW HEADS FROM DART they are cheap the 225 should work well and I believe (could be wrong) they flow 320 at .600 without being cnc'd
https://ls1tech.com/forums/showthrea...0&page=1&pp=20
09-13-2005, 01:17 PM
#7
Originally Posted by 02sierraz71_5.3
thats what I was thinking
check out these NEW HEADS FROM DART they are cheap the 225 should work well and I believe (could be wrong) they flow 320 at .600 without being cnc'd
https://ls1tech.com/forums/showthrea...0&page=1&pp=20
check out these NEW HEADS FROM DART they are cheap the 225 should work well and I believe (could be wrong) they flow 320 at .600 without being cnc'd
https://ls1tech.com/forums/showthrea...0&page=1&pp=20
On the DART heads, what great news that is!, hopefully the cost to build these motors will start dropping a bit now
Last edited by moregrip; 09-13-2005 at 01:36 PM.
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09-13-2005, 02:34 PM
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Originally Posted by superls1
If I am not mistaken, the 427 is typically achieved with a 4.125" bore and 4" stroke. The 408 is typically achieved with a 4.030" bore and 4" stroke.
09-13-2005, 03:40 PM
#9
I believe you would have to have it sleeved regardless of which block you start with, Im no expert though Im sure your machinist could sonic test it.
About the radix you should kill that 500 rw number, especialy with a blower on there, I wouldnt expect to see more that 5-8 psi though even with the high boost pulley on that big of an engine.
Its gonna cost alot more for those 19 extra cubes going from 408 to 427. To meet your goal I would save money on machining go with the 408 and put some good heads on it I know patriot and dart have some killer deals now and also LPE has designed some heads that should be in the same price range and flow very well all are capable of 300 cfm at .550 lift
!!! Let the price wars begin, its about time.
my .02
About the radix you should kill that 500 rw number, especialy with a blower on there, I wouldnt expect to see more that 5-8 psi though even with the high boost pulley on that big of an engine.
Its gonna cost alot more for those 19 extra cubes going from 408 to 427. To meet your goal I would save money on machining go with the 408 and put some good heads on it I know patriot and dart have some killer deals now and also LPE has designed some heads that should be in the same price range and flow very well all are capable of 300 cfm at .550 lift
!!! Let the price wars begin, its about time.my .02
09-13-2005, 06:13 PM
#10
Originally Posted by 02sierraz71_5.3
I believe you would have to have it sleeved regardless of which block you start with, Im no expert though Im sure your machinist could sonic test it.
About the radix you should kill that 500 rw number, especialy with a blower on there, I wouldnt expect to see more that 5-8 psi though even with the high boost pulley on that big of an engine.
Its gonna cost alot more for those 19 extra cubes going from 408 to 427. To meet your goal I would save money on machining go with the 408 and put some good heads on it I know patriot and dart have some killer deals now and also LPE has designed some heads that should be in the same price range and flow very well all are capable of 300 cfm at .550 lift!!! Let the price wars begin, its about time.
my .02
About the radix you should kill that 500 rw number, especialy with a blower on there, I wouldnt expect to see more that 5-8 psi though even with the high boost pulley on that big of an engine.
Its gonna cost alot more for those 19 extra cubes going from 408 to 427. To meet your goal I would save money on machining go with the 408 and put some good heads on it I know patriot and dart have some killer deals now and also LPE has designed some heads that should be in the same price range and flow very well all are capable of 300 cfm at .550 lift
!!! Let the price wars begin, its about time.my .02