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Assuming that my 80,000 mile car still had 330hp and 340tq at the crank. Then factoring in a %15 drivetrain loss.
I'm up 5hp and 15tq over stock
The real difference i feel is the torque comes in much sooner over stock.
Assuming that my 80,000 mile car still had 330hp and 340tq at the crank. Then factoring in a %15 drivetrain loss.
I'm up 5hp and 15tq over stock
The real difference i feel is the torque comes in much sooner over stock.
The 15% number is not right, IMO....IF your car is a stick. 10% is much more realistic for stick shift cars.
For reference, my LT1 stick is BOX stock, other than a K&N the PO put in it. At ~155,000 miles, that car did 278/312. Stock manifolds, exhaust, mufflers, everything. Stock.
Knowing that the car was rated 300 horse, flywheel from the factory, ^that's^ less than 10% drivetrain loss.
Last edited by Tom400CFI; Jun 12, 2023 at 09:34 PM.
The 15% number is not right, IMO....IF your car is a stick. 10% is much more realistic for stick shift cars.
For reference, my LT1 stick is BOX stock, other than a K&N the PO put in it. At ~155,000 miles, that car did 278/312. Stock manifolds, exhaust, mufflers, everything. Stock.
Knowing that the car was rated 300 horse, flywheel from the factory, ^that's^ less than 10% drivetrain loss.
I'll get it scanned for codes, I have had a check engine light on and figured it was from the lack of rear O2 sensors before the tune. Now I'm curious, ill also be running a compression test on it.
Called around a few shops and got a very basic quote to get all the machine work done to the block. If turning it into a 383 and getting the heads checked and p&p its going to run me about $1600.
I found this kit in an older thread about 383s and its on sale soooo..... Around 4k if I do all the assembly myself. Not as bad as I figured
IME back in the 1980s, working on cars from the 1960s and 1970s headers, exhaust and a tune was the easiest and cheapest horsepower available, beating heads, cams and intakes by a wide margin for a lot less $$$.
IME 50hp is a lot to expect from just headers, but I would say 25 is probably a sure thing.
Then you had to just have deal with the headers leaking every 6 weeks ..... which is why I personally never put headers on a car any more.
