How Much HP gains?
This is a discussion on How Much HP gains? within the Internal Engine forums, part of the LSx Technical Help Section category; How much could I expect to gain from a good port and polish job on a set of lt4 aluminum ...
02-11-2006, 03:29 PM #1
How Much HP gains?
How much could I expect to gain from a good port and polish job on a set of lt4 aluminum heads. Is 60hp reasonable? How much does port and polish usually cost ...and for the money should I buy AFR heads?
02-11-2006, 03:35 PM #2
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Oh hell no...mebbe 15-20....tops...
02-12-2006, 01:31 PM #3
The only way you could get that kind of increase from the stock LT4 heads, would be if they were the last restriction you removed from an otherwise optimized setup.
Presumably you are a 383ci LT1 right now, what other mods do you have? What has been done to your current heads? Are you running a cam?
If you have headers and supporting exhaust, decent size cam and high flowing intake, you might get 30 hp from swapping the heads, maybe more with good porting.
Keep in mind an engine is a system of devices that comprise an air pump. One single component, short another pump forcing air through it, can increase power output by 20%. You'll need a host of supporting mods for the best results.Hammer - hammertime.us
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02-12-2006, 07:50 PM #4
My current set-up is 383 stroker with lt-4 manifold and heads. It has comp cam 224/230 cam and engine is 10/5/1 compression. other mods consume of full slp LM exhaust, slp shorty headers, ram air intake with k&n filter, 58mm throttle body on ported intake, high flow cat, 160 degree therm, 4.10 gears, PCM tune. With these mods and say the best port and polish job you could get on a set of lt-4 heads what kinda gains can i get? Is it worth paying 2 grand for the port job and install? or should I buy AFR heads?
02-12-2006, 08:23 PM #5Originally Posted by 95TA383
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