suggested compression
#1
suggested compression
Im looking into buying a ls or vortech block and building it with forged internals. Im wanting to build the motor to around 550 hp with running high compression and a big cam and a fast intake like so http://www.summitracing.com/parts/FST-146302/. What compression do you guys think I should run?
#2
Cubes you plan on?
Car/truck its going in? Setup?
Intended usage? Track, strip, street, bragging?
What cam range?
Cam size and usage are going to be the biggest factors, but the others play a part in it as well.
EDIT: fuel available is a big part of street, or street/strip
Car/truck its going in? Setup?
Intended usage? Track, strip, street, bragging?
What cam range?
Cam size and usage are going to be the biggest factors, but the others play a part in it as well.
EDIT: fuel available is a big part of street, or street/strip
#3
I think im going for a ls1 and it will problly be going in my 85 trans am but not sure yet. I will be using it for street/strip/and bragging haha. and problly over 600 lift on the cam.
#4
What fuel you have available, and want to use.
A 5.7 with around 230 duration cam will want close to 11:1, provided 93 is around, although more comp OR less octane can be done with a really good tune. Depending on heads/pistons this shouldn't be too difficult to do. With a stroked 5.7 it is quite easy to do.
A 5.7 with around 230 duration cam will want close to 11:1, provided 93 is around, although more comp OR less octane can be done with a really good tune. Depending on heads/pistons this shouldn't be too difficult to do. With a stroked 5.7 it is quite easy to do.
#6
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with stock cubes just use a stock crank. good rods and pistons and you will be golden. depending on heads,somethink in the low 23x intake range, mid to high 23x on exhaust should be a good size all around performer, maybe have it on a 112 +2 or so. that is just something i threw out there for you, no cam expert but somewhere around that will be pretty close to what the pros will suggest.
as for compression, 11:5 should be easily attainable without issues with the right head gasket and head cc.
as for compression, 11:5 should be easily attainable without issues with the right head gasket and head cc.
Last edited by slow trap; 07-27-2010 at 11:21 AM.
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#10
Should be fairly attainable in that case. I do not have the capabilities to spec cams, but for that high rating, I would think a 240 range with 11.5:1-12.0:1 compression with heads that match should get you your goal of 550 to the tire.
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the vortech heads will only fit sbc type motors. you will need an ls specific type head. something like the afr 205,afr 225 small bore or tfs 215 would be a great head for you if you can afford something like that.
#15
MINIMUM 4.000" stroke, 4.030" pistons to give you a 408. Then you would need well massaged L92/LS3 heads with lightweight LS3 valves, OR AFR 245s OR Trickflow 235s, 1 7/8" - 2" LT quality headers, FAST 102 & TB, no MAF, and a cam in the 242/250 0.625/0.625 115 LSA range depending upon head selection. Compression ratio should be minimum 11.5:1 if not closer to 12:1 to attain your goal. This is my guess list to get a 408 close to 600 rwhp
#20
just bouncing around some ideas haha still looking for a ls1 block and was looking into this https://ls1tech.com/forums/parts-cla...-assembly.html