67-69 Firebird owners, looking for info.
#1
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Alright guys...I have a 68 Firebird 400 4 speed that I am about to start working on. Non-original motor, is now a TH400 trans but have a Muncie on the way. I know this is an LSX site and I love the LS1 in my 01 WS6 but I want this car to be somewhat original so no T56s or LS1 swaps.
I am wondering what kind of upgrades you have done to your motors weather they be a 400, 455 or whatever pontiac you have in it but am really interested in the 400. I plan on rebuilding the motor, maybe a bit more compression, aluminum heads, performance parts, headers ect. What kind of performance or horsepower have you gotten from them and how is the drivability?
Thanks for the info guys I really appreciate it, im looking forward to FINALLY having an old school muscle car.
I am wondering what kind of upgrades you have done to your motors weather they be a 400, 455 or whatever pontiac you have in it but am really interested in the 400. I plan on rebuilding the motor, maybe a bit more compression, aluminum heads, performance parts, headers ect. What kind of performance or horsepower have you gotten from them and how is the drivability?
Thanks for the info guys I really appreciate it, im looking forward to FINALLY having an old school muscle car.
#2
TECH Enthusiast
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Bro, I love my 400. It's balanced, built, blue-printed, and rev's up real fast. BUT honestly, I wish I had gone with a 455. I have some buddies with 455's and the low-end torque they have is amazing.
#3
TECH Enthusiast
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Hey I didn't have much time last time I posted to get into things. I actually went with cast iron 6x-4 heads, but I was young and broke. I'd go with Alum' heads, probably edelbrocks. Other then that, my 400 has a performer RPM intake, XE 274 cam, and is completely balanced. It needs good gears and a stall to be driveable. And puts out about the same amount of power as an LS1. If I was to do the same build up, and simply used a stroker set-up and built a 455 out of my engine, it would probably produce about 100 more horses. The increase in compression, and displacement, would help a lot.
That's on the list for future upgrades...
That's on the list for future upgrades...
#4
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Thanks for the info!
I am looking into the stroker kits sold that turn the 400 into a 461. Im not looking for a race car or anything, just a stout weekend car to take to shows and on cruises. I want it to be reliable so im not going too wild with it. On the outside it will be all stock but drop spindles, wheels and a rear spoiler. Under the hood i want it to be stock drivetrain and would like ot keep the 400 block, 4 speed muncie, and 12 bolt rear.
Thanks again for your help!
I am looking into the stroker kits sold that turn the 400 into a 461. Im not looking for a race car or anything, just a stout weekend car to take to shows and on cruises. I want it to be reliable so im not going too wild with it. On the outside it will be all stock but drop spindles, wheels and a rear spoiler. Under the hood i want it to be stock drivetrain and would like ot keep the 400 block, 4 speed muncie, and 12 bolt rear.
Thanks again for your help!
#5
12 Second Club
iTrader: (6)
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Go to the Performance Years forum. Lots of old school Pontiac knowledge.
http://forums.performanceyears.com/forums/
Oh, I love my 455's torque, too!!!
http://forums.performanceyears.com/forums/
Oh, I love my 455's torque, too!!!
#7
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Go to the Performance Years forum. Lots of old school Pontiac knowledge.
http://forums.performanceyears.com/forums/
Oh, I love my 455's torque, too!!!
http://forums.performanceyears.com/forums/
Oh, I love my 455's torque, too!!!