Input on planned motor build
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Joined: May 2018
Posts: 80
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From: Omaha, NE
Car: 86 Trans Am
Engine: Carb'd LM7
Transmission: TH400
Axle/Gears: Stock 2.73
Input on planned motor build
I need input from the SBC gurus out there.
Goal is an 11 second streetable Trans Am N/A. I plan on shooting NOS down whatever I build, but would like to accomplish that level on motor alone.
Lets say the car weighs 3500lbs with me and tank of gas in it. Using this tool tells me I'll need to put 400 hp down to the wheels.
Assuming a 20% driveline loss, that's 480 at the crank.
I'd like to keep this in a reasonable budget, so spinning the block above 6500 regularly is probably out of the question. Which means I need a torque monster.
Right now I'm leaning towards stroking out a junkyard vortec block. Would like to keep the car Carb'd and remove all the computer bits, switching over to HEI
Haven't decided on a Cam, thinking these heads with this rotating assembly. Got a good price on a Holley 770 Street Avenger. Pretty much set on putting in Hooker 2210s, not set on rest of the exhaust but leaning towards a custom full dual setup.
Cam would most likely be a roller stick. I'd happily buy some comp magnums with a 1.6 ratio to bump lift, but it doesn't look like I'll gain much by going past .600 with my current head choice. Reading old Vizard books makes me think I should keep overlap low and aim for a tight LSA. His advice is well regarded, but it is a 20 year old book.
Am I on the right track here? I know I'm aiming high, but is my goal do-able for a first time engine builder?
Goal is an 11 second streetable Trans Am N/A. I plan on shooting NOS down whatever I build, but would like to accomplish that level on motor alone.
Lets say the car weighs 3500lbs with me and tank of gas in it. Using this tool tells me I'll need to put 400 hp down to the wheels.
Assuming a 20% driveline loss, that's 480 at the crank.
I'd like to keep this in a reasonable budget, so spinning the block above 6500 regularly is probably out of the question. Which means I need a torque monster.
Right now I'm leaning towards stroking out a junkyard vortec block. Would like to keep the car Carb'd and remove all the computer bits, switching over to HEI
Haven't decided on a Cam, thinking these heads with this rotating assembly. Got a good price on a Holley 770 Street Avenger. Pretty much set on putting in Hooker 2210s, not set on rest of the exhaust but leaning towards a custom full dual setup.
Cam would most likely be a roller stick. I'd happily buy some comp magnums with a 1.6 ratio to bump lift, but it doesn't look like I'll gain much by going past .600 with my current head choice. Reading old Vizard books makes me think I should keep overlap low and aim for a tight LSA. His advice is well regarded, but it is a 20 year old book.
Am I on the right track here? I know I'm aiming high, but is my goal do-able for a first time engine builder?
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