Re: Year End Horsepower Adjustments...
 

Boys, when you build a motor for GT you gotta know there are a lot of people out there who are gonna get it hit. Think about the guys that can buy a new motor any time they want to. Especially if it's a Chevy.

Re: Year End Horsepower Adjustments...
 

Charlie Bob, there would be more room for improvement if it wasn't basically a super stock motor already. Couldn't resist.

Re: Year End Horsepower Adjustments...
 

Let's do a little comparison to that 283/220 Chevelle you're talking about and your 281/235/229 Cobra Jet.

Chevelle
283 cubic inches
9.25:1 compression
Rochester 4GC Carburetor
1.72 1.50 valves

Cobra Jet
281 cubic inches
11.0:1 compression
2x 62.5mm throttle body
2x 1.34 1x 1.50 valves

Cubic inches are a wash, compression to the CJ, carb/throttle body to CJ, valve area to CJ (plus lighter intake valves).

Take away the cam lift difference and intake difference because we're talking SS, add in the overhead cam and better heads to start with, and it's looking like that 281 of yours should be making quite a bit more power than that 283 Charley.

I'm not going to say that you don't work hard on your car because you do, it's a lot more of a real stocker than many new cars out there, but I do not believe you have built a true SS motor with all of the tricks and good parts that is necessary for most combinations to run fast.

Re: Year End Horsepower Adjustments...
 

what are you and Worner talking about ??? You guys are not even at the STOCK hp rating for the LT1 .........isn't that kind of cheezy ????

Re: Year End Horsepower Adjustments...
 

An actual stock LT1 makes nowhere the NHRA Stock Eliminator HP rating. There is a LOT of work in those heads that is passing tech. Plus, it is a very efficient car. Light, aero-slick with a lot of natural engine set back. If it was rated at what a factory stock LT1 actually makes they would be even more dangerous.

Re: Year End Horsepower Adjustments...
 

Can anyone shed some light on why the exact same motor, 1966 275HP 327 Chevy, should be rated differently in the three body styles (Nova, Chevelle and Full-size) it was originally available in? I can understand that there might have been a difference from the factory, but are people building these motors differently depending on which vehicle they are putting them in?

Thanks!

Re: Year End Horsepower Adjustments...
 

Maybe the 327's without 4GC's are the red headed step children . Once again the 68 327-250/265 GT combo gets no reduction. . Maybe the idea is to have older cars run SS and only slipery cars run GT.! However, the 68 327/275 stock version is now 265>
anyone got a 68 Chevelle?

Re: Year End Horsepower Adjustments...
 

that was my point Ed........the NHRA Super Stock LT1 horsepower rating is nowhere close to the NHRA STOCK hp rating........what is the problem ??? Super Stock horsepower should be raised to at least match NHRA STOCK rating----does that not make sense ????

Re: Year End Horsepower Adjustments...
 

Rusty Super Stock guys are a lot smarter then Stockers who have the Lt1. If you run more than 1.00 under NHRA will beat you up with the ink pen. Thats why we are at 346 now. :):)

Re: Year End Horsepower Adjustments...
 

I don't see why. Maybe you need to build one to show the rest of us how it should be done.