853 vs 799 heads
853 vs 799 heads I'm building a single turbo ls1 with a stock bottom end. I will be running an aftermarket boost oriented cam (undecided at this point). I'm looking for roughly 550rwhp. I have 853 heads on the engine. I can get 799 heads for a good price. Which would be better with boost on stock pistons? Neither will be ported, but will have aftermarket springs. I'll also be running the stock ls1 intake as well.
I'm building a single turbo ls1 with a stock bottom end. I will be running an aftermarket boost oriented cam (undecided at this point). I'm looking for roughly 550rwhp. I have 853 heads on the engine. I can get 799 heads for a good price. Which would be better with boost on stock pistons? Neither will be ported, but will have aftermarket springs. I'll also be running the stock ls1 intake as well.
Will there be a significant difference going from the 853 to 317 head? This is a budget build so If I can reach my 550 HP goal with the 853 heads, I will stick to them. I remember reading that the 853 head has a thin point at the head gasket due to the design.. has anyone ever had an issue with that with boost before?
One more question.. say if I decided to spend money and pick up 317 heads, would the money be better spend porting the heads I have now?
One more question.. say if I decided to spend money and pick up 317 heads, would the money be better spend porting the heads I have now?
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Joined: Mar 2014
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From: Ohio
Its going to cost you a lot more than the price of a pair of 317s to get your 853s ported to perform like them (unless you know someone willing to do a decent port job for the price of beer).
317s are more pump gas friendly and flow better than the 853s. On top of the port work, you'd need chamber work as well.
317s are more pump gas friendly and flow better than the 853s. On top of the port work, you'd need chamber work as well.
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I was actually thinking about running E85. There is a station pretty close to my house right off base. Is there any reason that I should stick with 93 over the e85?
Will drivability suffer? Is it much harder to get a tune with e85? Thanks for the responses guys! It sounds like I may just run the heads I have now. Im still doing more research on my setup as it will still be a few months before its ready to run. I still have to build my t56 as well.
Will drivability suffer? Is it much harder to get a tune with e85? Thanks for the responses guys! It sounds like I may just run the heads I have now. Im still doing more research on my setup as it will still be a few months before its ready to run. I still have to build my t56 as well.
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Verdad Gallardo With the research ive been doing, it seems like I should be running a 5.3 or maybe a 6.0 with boost. Is there any reason that I should ditch the ls1 and go to the iron block? Most of my research has pretty much said to run the 5.3 for these reasons:
1.Most responses on the 5.3: Its cheap. Run it till it pops and get another for $300.
My take: They are not cheap where I live.. 5.3's are going for $1K used. 6.0's are $1300+.
2. They will take more boost and are stronger in stock form.
This goes back to the fact they are not cheap where I live. If I just upgrade the rods and possibly a set of forged pistons with ARP fasteners throughout, is there any reason I cant make the same power with the less weight of the aluminum block?
Thanks for the help guys, I like to ask a lot of questions Lol.
1.Most responses on the 5.3: Its cheap. Run it till it pops and get another for $300.
My take: They are not cheap where I live.. 5.3's are going for $1K used. 6.0's are $1300+.
2. They will take more boost and are stronger in stock form.
This goes back to the fact they are not cheap where I live. If I just upgrade the rods and possibly a set of forged pistons with ARP fasteners throughout, is there any reason I cant make the same power with the less weight of the aluminum block?
Thanks for the help guys, I like to ask a lot of questions Lol.
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From: Colorado Springs, Co/ Central, Ca
Should make and hold over 550 HP completely stock. A nice little cam and valve springs would help and the cam will make the power at lower boost. 317 heads do flow A lot better and would prob still make more power even with the drop in CR.
Read my build thread in my sig. No reason to switch to an stock bottom end iron block for anything less than 750whp.
For your power levels, buy a set of good valvesprings and throw the turbo on it. Leave the heads alone and spend the money on head studs.
For your power levels, buy a set of good valvesprings and throw the turbo on it. Leave the heads alone and spend the money on head studs.
