650hp N/a On Pump Gas ???
650hp N/a On Pump Gas ??? I'm looking to up the power in my current motor that is in my 69 Camaro that is in my sig. The engine dyno showed 527hp at the crank but with my calculations it shows that I am making 470hp to the wheels to go 11.4@119 in a 3600lb car. So I'm thinking that I'm making a little more than 527hp at the crank. Here is what I have: a stock 6.0 bottom end with ARP 2000 rod bolt installed. Pistons are out of the hole.015 and with a .060 head gasket and 65cc ported 243 heads; I'm coming up with 10.77 to 1. I am running stock rockers with Comp cam 234/238 598/605 lift with 115+4 lobe seperation and CTSV race lifters. My ported 243's flow 330's at 650 lift on the intake. All this is breathing through a ProSystems carb.
My question is- What would you change in this combo to have a 650HP motor on 93 octane pump gas?
I was thinking about milling the heads and intalling a GM MLS heads gasket with a .051 thickness to bump up my compression to 12 to 1.
Is 12 to 1 to high for 93 octane on a steel block with a aluminum heads?
Do I need a more agressive cam ?
I am looking for a very streetable combo. I drove my current setup for 75-90 minute trips a ton of times with 3.73's and a turbo400. It ran like a Cadilac and returned a decent 18mpg. Should I just leave everything alone and be happy with my current combo? Or do I let the winter season gremlins get to my hunger for more power?
What are your suggestions?
My question is- What would you change in this combo to have a 650HP motor on 93 octane pump gas?
I was thinking about milling the heads and intalling a GM MLS heads gasket with a .051 thickness to bump up my compression to 12 to 1.
Is 12 to 1 to high for 93 octane on a steel block with a aluminum heads?
Do I need a more agressive cam ?
I am looking for a very streetable combo. I drove my current setup for 75-90 minute trips a ton of times with 3.73's and a turbo400. It ran like a Cadilac and returned a decent 18mpg. Should I just leave everything alone and be happy with my current combo? Or do I let the winter season gremlins get to my hunger for more power?
What are your suggestions?
TECH Resident
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whats the actual octane reading out of 93 fuel-
i dont know if the comp is to high or do-able-but a lot of this will be down to how efficent the head chamber is-
depends what u find agressive-
but with me not having that much cam know how-u would need to be a in lower region of lsa-
i dont know if the comp is to high or do-able-but a lot of this will be down to how efficent the head chamber is-
depends what u find agressive-
but with me not having that much cam know how-u would need to be a in lower region of lsa-
Last edited by njc.corp; Oct 25, 2008 at 09:51 PM.
If you have 527 at the crank and are running a turbo 400. You don't have anywhere near 470 at the wheels. If you had a 6 speed you'd be around 440 to the wheels. With the T400 you are in the 410-420 range if that. That would be about right for your mph. I don't think it is possible to reach your goals with a stock bottom end on pump gas. You will be looking at a decent size stroker motor with some good heads to get there.
If you have 527 at the crank and are running a turbo 400. You don't have anywhere near 470 at the wheels. If you had a 6 speed you'd be around 440 to the wheels. With the T400 you are in the 410-420 range if that. That would be about right for your mph. I don't think it is possible to reach your goals with a stock bottom end on pump gas. You will be looking at a decent size stroker motor with some good heads to get there.
So then what do you think is the max hp that I can make with stock bottom end and 93 octane?
Weve made 450+ thru Th400 on our Mustang dyno with 6.0L engines on pump gas, but at best Id bet thats 600 tops at the engine, doubtful that much. 450 on this dyno traps about 130 for example
Your not going to make 650 actual flywheel hp with 370 cubes without alot fo $$$$ THats a car that traps 135-140 mph
Weve made 450+ thru Th400 on our Mustang dyno with 6.0L engines on pump gas, but at best Id bet thats 600 tops at the engine, doubtful that much. 450 on this dyno traps about 130 for example
Weve made 450+ thru Th400 on our Mustang dyno with 6.0L engines on pump gas, but at best Id bet thats 600 tops at the engine, doubtful that much. 450 on this dyno traps about 130 for example
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TECH Resident
Joined: Jun 2007
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dont look to hard in the peak lift numbers-u got to look more down low as thats the moving of the car area-(for argument sake)
dont buy or base cyclinder head performance on just flow/cfm numbers-
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what and why does it matter what the head flows as long as its going to move the air in and out quick-not lift numbers-
dont look to hard in the peak lift numbers-u got to look more down low as thats the moving of the car area-(for argument sake)
dont buy or base cyclinder head performance on just flow/cfm numbers-
dont look to hard in the peak lift numbers-u got to look more down low as thats the moving of the car area-(for argument sake)
dont buy or base cyclinder head performance on just flow/cfm numbers-
around 4500 if you flash it. I was launching the car on the transbrake at 3600-3800. But there is also a diffrence between your 427 and my 364. So I do not want to go with a cam that is going to be undriveable.
L92 heads do flow good #'s out of the box but there isn't a good flowing aluminum carb intake out there yet that can keep up with them.
Yeah that's for sure. About the best you can do there is get the GMPP carb intake and have it port matched and opened up. If someone did come out with a good one I'd be all over it myself and rig it up for fuel injection.
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yes speak to a head/intake/cam guy-start at the top where the entry point is-
someone like richard at WCCH and brian at TEA will tell u what or what not to do- or if it is going to get u their-(That is if u dont have a baseline understanding yet)
thats what i did-its looking to be alright for me-but it aint a apple to apple thing-
Thanks
someone like richard at WCCH and brian at TEA will tell u what or what not to do- or if it is going to get u their-(That is if u dont have a baseline understanding yet)
thats what i did-its looking to be alright for me-but it aint a apple to apple thing-
Thanks
We have a carb style intake for the heads we have on Ashleys car. That top end might do well for you, 11.9:1 compression, 230 cc head on AshWS6 car https://ls1tech.com/forums/drag-racing-results/749327-all-time-fastest-na-ls-any-c-i.html We dont do much carb stuff really, alot of it can be in getting the carb to provide a good mixture across the board rpm and cyl-cyl wise
Last edited by GrannySShifting; Oct 27, 2008 at 09:40 AM.
