Need help with engine build
11-30-2009, 11:43 PM
#1
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Need help with engine build First off i've been doing a lot of research. So far I have decided to go with a FAST 90/90, a tsp228r cam on a 112 asa, and some PRC Stage 2.5 LS6 heads milled down to give me a 11:1 compression ratio. Stock cubes. It will be run through a M6. My goals with the car are 425rwhp and to still get decent gas mileage while cruising, because this is my daily driver. And hopefully be somewhere in the 11's. My questions with this build are the following. 1. What size header should I run, 1 7/8''s or 1 3/4"s? 2. What size pushrod will I have to run with a milled down LS6 head? 3. Will I have to flycut the pistons with the 2.02/1.57 valves? 4. Will I be safe running a 11:1 compression ratio on a street car on 91 octane? The reason I want the higher compression is because it will help with torque as well as gas mileage.
Any help is appreciated!
Any help is appreciated!
12-01-2009, 09:18 AM
#2
Its 112 LSA, not asa...for future reference.
On a stock cube LS1 the 1-3/4" headers are fine.
Whoever you get the heads from should be able to tell you the PR length you need although buying a length checker and checking yourself would be ideal.
From what I remember, the lift on the newer 228R cam is pretty stout (over .600) and it may not clear depending on your cc size and headgasket thickness your going to use.
You can probably squeek by on 91 octane but the timing is going to have to stay lower than normal being that you should really have 93 and with the shitty gas/ethanol blend these days.
Hope this helps
On a stock cube LS1 the 1-3/4" headers are fine.
Whoever you get the heads from should be able to tell you the PR length you need although buying a length checker and checking yourself would be ideal.
From what I remember, the lift on the newer 228R cam is pretty stout (over .600) and it may not clear depending on your cc size and headgasket thickness your going to use.
You can probably squeek by on 91 octane but the timing is going to have to stay lower than normal being that you should really have 93 and with the shitty gas/ethanol blend these days.
Hope this helps
12-01-2009, 02:32 PM
#3
Launching!
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Its 112 LSA, not asa...for future reference.
On a stock cube LS1 the 1-3/4" headers are fine.
Whoever you get the heads from should be able to tell you the PR length you need although buying a length checker and checking yourself would be ideal.
From what I remember, the lift on the newer 228R cam is pretty stout (over .600) and it may not clear depending on your cc size and headgasket thickness your going to use.
You can probably squeek by on 91 octane but the timing is going to have to stay lower than normal being that you should really have 93 and with the shitty gas/ethanol blend these days.
Hope this helps
On a stock cube LS1 the 1-3/4" headers are fine.
Whoever you get the heads from should be able to tell you the PR length you need although buying a length checker and checking yourself would be ideal.
From what I remember, the lift on the newer 228R cam is pretty stout (over .600) and it may not clear depending on your cc size and headgasket thickness your going to use.
You can probably squeek by on 91 octane but the timing is going to have to stay lower than normal being that you should really have 93 and with the shitty gas/ethanol blend these days.
Hope this helps
12-01-2009, 03:35 PM
#5
TSP can give you better info than somebody guessing your clearance for you. TSP can also sink your valves deeper into the heads your planning on buying from them giving you addditional clearance. How much? You'll have to call them or maybe Jason or Jon will respond.
12-03-2009, 09:57 AM
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Questionable about valve clearance, measure. Unsure for any reason about pushrod length, measure. To run elevens you will likely need a good rear end, sticky tires, driveshaft, and rear suspension.
