I just thinking, what is a realistic HP number that a NA can achieve with the mods that Jr.Day or anyone else has come across.

Now Im not talikng wild mods, but something to get the car into Series Two */C range (doable?)

Im assuming Cam, rockers, springs?? anything else??


SO what kind of numbers are expected and what parts are required to achieve them??

Jr. Day eh?

mmm...well it depends a lot on how much you wanna spend. I rapped some #'* into the Dyno2003 sim software and came up with:

'63 cam, ported heads, rockers, 10.1:1 CR, smaltube headers and muffler:
258hp@5500rpm 278#@4000rpm

Same but 8.5:1 CR, no headers:
211hp@5500rpm 240#@4000rpm

Not sure of its accuracy but I got renewed confidence yesterday when Horsepower Tv used the exact same program while they were building an engine and it came up within like 3hp of actual dyno results. Of course it is their job to sell the stuff though. In anycase I wouldn't live by it, but it should get you in the ballpark.

ok well im just saying that if you do a simple cam, rockers, and springs if needed what kinda of gains are you looking at

If you ported and milled the heads and LIM, i think that you would be able to take more advantage of a cam and or rockers.
Aren't the series one heads not so good in terms of flow? (someone correct me if i'm way off base)
and that compression ratio isn't helping you.
And if you got a metal UIM you could port match it to a series 1 L67 TB (maybe?)

If this is what you get, i'd say low 15s. My car has 262hp @5000-5500 and 337ftlbs @2800. I hope to run high 14'*.

His SLE is probably lighter too and if he puts a 3.33 diff in there that a few tenths right there.

Good point. I didn't see the 3.33. Scratch that low 15s. Try high to mid 14s with the 3.33 dif. A L27 runnin mid 14 without forced induction, thats awsome. I atta tell my dad that. He wishes he had my power.

so we are saying that with cam, and rockers,springs, maybe a L67 TB with the 3.33 gears

we could be looking at mid 14'*

I hope to be faster than him!! lol Cam rockers and manifold should get you relitivly close to * II */C'd. Remember that you should already have the gearing advantage over them *i think*