402 all aluminum project starting soon, i have some questions come in plz
06-19-2006, 07:10 PM
#1
TECH Fanatic
Thread Starter
iTrader: (70)
Join Date: Oct 2005
Location: Los Angeles, California (818)
Posts: 1,219
Likes: 0
Received 0 Likes
on
0 Posts
402 all aluminum project starting soon, i have some questions come in plz ok guys, i finaly decided on my project now this will be done over time, it will problably take me 2 yrs but it will get done, my plan is an aluminum ls1 402, im buying a block in good condtition with the 4'' bore already and main caps, when i get it im gonna take it so it can be cleaned, and ready for machining, all of the cylinder walls are in good shape, soon im gonna get a 4'' eagle crank, not sure on pistons thought thats why im posting here i need some help on what pistons to get here are my questions plz help
1. how much do you thnk i will have to maching the cylinder walls so it can be ready to assemble?
2. what size heads as in cc do i need to get the same compression as my stock ls1 or around near the same, cause i want to be running on pump 91 octane here in cali, i guess you have to tell me size of piston to? what piston and head to achieve this?
3. is it a good ideal to cryo treat the main caps?
4. i have to stay emissions legal here in cali, can i do this and what if i keep my cats, or will i have to get mild heads and cam?
thnx for help
1. how much do you thnk i will have to maching the cylinder walls so it can be ready to assemble?
2. what size heads as in cc do i need to get the same compression as my stock ls1 or around near the same, cause i want to be running on pump 91 octane here in cali, i guess you have to tell me size of piston to? what piston and head to achieve this?
3. is it a good ideal to cryo treat the main caps?
4. i have to stay emissions legal here in cali, can i do this and what if i keep my cats, or will i have to get mild heads and cam?
thnx for help
Last edited by themack56; 06-19-2006 at 07:21 PM.
06-20-2006, 10:18 AM
#5
TECH Resident
iTrader: (3)
Join Date: Nov 2002
Location: Pewee Valley,Ky
Posts: 824
Likes: 0
Received 0 Likes
on
0 Posts
ok guys, i finaly decided on my project now this will be done over time, it will problably take me 2 yrs but it will get done, my plan is an aluminum ls1 402, im buying a block in good condtition with the 4'' bore already and main caps, when i get it im gonna take it so it can be cleaned, and ready for machining, all of the cylinder walls are in good shape, soon im gonna get a 4'' eagle crank, not sure on pistons thought thats why im posting here i need some help on what pistons to get here are my questions plz help
1. how much do you thnk i will have to maching the cylinder walls so it can be ready to assemble?
they will only need to be touch honed.
2. what size heads as in cc do i need to get the same compression as my stock ls1 or around near the same, cause i want to be running on pump 91 octane here in cali, i guess you have to tell me size of piston to? what piston and head to achieve this?
4" stroke, 4" bore, -13.7cc piston, 68cc heads will give you about 10:1
3. is it a good ideal to cryo treat the main caps?
probably overkill, depends on your goals
4. i have to stay emissions legal here in cali, can i do this and what if i keep my cats, or will i have to get mild heads and cam?
thnx for help
it can be done, but some of the cali guys will be able to answer this one better, here in KY we don't deal with emissions
1. how much do you thnk i will have to maching the cylinder walls so it can be ready to assemble?
they will only need to be touch honed.
2. what size heads as in cc do i need to get the same compression as my stock ls1 or around near the same, cause i want to be running on pump 91 octane here in cali, i guess you have to tell me size of piston to? what piston and head to achieve this?
4" stroke, 4" bore, -13.7cc piston, 68cc heads will give you about 10:1
3. is it a good ideal to cryo treat the main caps?
probably overkill, depends on your goals
4. i have to stay emissions legal here in cali, can i do this and what if i keep my cats, or will i have to get mild heads and cam?
thnx for help
it can be done, but some of the cali guys will be able to answer this one better, here in KY we don't deal with emissions
06-20-2006, 07:14 PM
#7
TECH Resident
Join Date: Jan 2006
Location: harrisburg, pa
Posts: 991
Likes: 0
Received 0 Likes
on
0 Posts
have you thought about a callies crank? ive heard a lot of stories about any header other than shorties failing in cali.. You should post in the regional section to find out about that..
Trending Topics
06-20-2006, 07:27 PM
#8
TECH Fanatic
Thread Starter
iTrader: (70)
Join Date: Oct 2005
Location: Los Angeles, California (818)
Posts: 1,219
Likes: 0
Received 0 Likes
on
0 Posts
yea i thought about that to, that i should put my stock manifolds or shorty headers, ill go with shorty headers cause anything is better than stock
06-20-2006, 07:42 PM
#9
TECH Resident
iTrader: (3)
Join Date: Nov 2002
Location: Pewee Valley,Ky
Posts: 824
Likes: 0
Received 0 Likes
on
0 Posts
no reason to use any crank other than the Eagle for your goals. callies and lunati are very nice cranks no question, but for N/A applications the Eagle is fine, hell we have one is a 700+rwhp turbo car.
06-20-2006, 07:44 PM
#10
This is my writeup of when I did mine. Read it. I made all of the mistakes for you. Follow the links to the associated posts also as I continued in different areas of the boards based on the different problems.
https://ls1tech.com/forums/generation-iv-internal-engine/433240-started-install-my-ls2-402-slp-w-pics.html
Correct me if I am wrong but a 402 can't be made from a stock Aluminum LS1 block. You will either need to use an Iron 6.0 block which gets you to 408 (bored .030 over I think) or an LS2 block. If you decide to go aluminum LS2 then you will need to get some stuff that wont swap over. I think that everything swaps right into the iron 408 block though. Not sure as I went the other (LS2) route.
Someone can correct me if I am wrong on this part also but I am pretty sure that I am write on this one and a search will lead you to some more detailed explanation.
Unless you are a machinist or have a machine shop at your beck and call, you are better off (money, time and aggravation) buying an assembled short block from one of the sponsors. I think that I did the math and found that even providing the block (free) does not work out to a savings. Not to mention all of the potential finger pointing that could happen if you use one guy to machine and another to assemble.
Just my $.02
https://ls1tech.com/forums/generation-iv-internal-engine/433240-started-install-my-ls2-402-slp-w-pics.html
Correct me if I am wrong but a 402 can't be made from a stock Aluminum LS1 block. You will either need to use an Iron 6.0 block which gets you to 408 (bored .030 over I think) or an LS2 block. If you decide to go aluminum LS2 then you will need to get some stuff that wont swap over. I think that everything swaps right into the iron 408 block though. Not sure as I went the other (LS2) route.
Someone can correct me if I am wrong on this part also but I am pretty sure that I am write on this one and a search will lead you to some more detailed explanation.
Unless you are a machinist or have a machine shop at your beck and call, you are better off (money, time and aggravation) buying an assembled short block from one of the sponsors. I think that I did the math and found that even providing the block (free) does not work out to a savings. Not to mention all of the potential finger pointing that could happen if you use one guy to machine and another to assemble.
Just my $.02
06-20-2006, 07:51 PM
#11
TECH Fanatic
Thread Starter
iTrader: (70)
Join Date: Oct 2005
Location: Los Angeles, California (818)
Posts: 1,219
Likes: 0
Received 0 Likes
on
0 Posts
my block cost me is costin me 340, and all it needs is a quick hone, the 4'' bore is there already and sleeved, all i have to do is a quick hone, so whats a 4'' bore with 4.000 crank, i think thats a 402, or what is it?
06-20-2006, 07:57 PM
#12
TECH Fanatic
Thread Starter
iTrader: (70)
Join Date: Oct 2005
Location: Los Angeles, California (818)
Posts: 1,219
Likes: 0
Received 0 Likes
on
0 Posts
i just did the math, and it comes out to 402 6.59 liter block, if i use -13.7 pistons and 68 cc heads ill get 11.0789:1, which will run on pump has
06-20-2006, 09:31 PM
#15
TECH Apprentice
iTrader: (10)
Join Date: Jun 2005
Location: QUEENS
Posts: 340
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by SSilverSSurfer
i heard to stay away from lunati cranks, might want to try somehting else if thats true
06-20-2006, 11:48 PM
#16
Staging Lane
iTrader: (1)
Join Date: Oct 2004
Location: Palm Beach Gardens, FL
Posts: 59
Likes: 0
Received 0 Likes
on
0 Posts
There's no way your calculation is correct with ports that size and 14 cc dished pistons. Also, you didn't specify your head gasket thickness which is required to make the determination. I suspect you'll be right around 10:1 or less unless you mill or get flattop pistons.
http://www.alantripp.com/VE Calculat...igy Lookup.xls
http://www.alantripp.com/VE Calculat...igy Lookup.xls
