408Firebird

I have just bought the car and i have all of those parts on my car. So what will it run and what would you say the estimated HP number is?


SBC 408
9.7 compression
Hypertectic Pistons
"997" cast heads opened up to 2.02/1.60


Comp Cams Magnum 286H camshaft
286/286 Duration (advertised)
236/236 Dur. @ .050 Lift
.490/.490 Lift With 1.5:1 Roller Rockers


weiland dual plane intake manifold
hooker super comp 1 3/4 long tube headers
4 inch mufflex exhaust
Holly 770 Street Avenger Carb
3:73 gears

torque arm
sub frame connectors

All through a 5 Speed Trans.

ljnowell

are those heads the 997 casting thats similar to a 993 or an 882? If so, coupled with the magnum cam, I would guess low 13's. at best. Thats assuming smog heads and an old design cam. The single pattern really wont work well with a stock head design. Any more info on the heads.

joeblue83

iTrader: (8)

With some bigger heads and cam, this would probably make it into the low 12's

89formula350b2l

iTrader: (11)

http://www.compcams.com/Technical/Se...umber=08-450-8

according to comp cam that isnt the specs that you said they were

408Firebird

http://www.compcams.com/Technical/Se...umber=12-326-4

you looked up the wrong cam............

-----------------------------------------
what h/c combo would let this car go low 12s?

That is all of the info i have on the heads sorry but thx for the help.

xpndbl3

iTrader: (5)

vortec heads
XE274

will go low 12s with 3500 stall and 3.73 gear and 26" slicks.

408Firebird

Could i get any technical reason of why my heads and cam are not good at all just becuase i want to know more about what i have. Like what makes my cam old tech. and why my heads are so bad.

Thanks again.

igotta355z28

iTrader: (1)

id say you have 750 horse power, or maybe 275 donkey power...o wait i know 1000 goat power. dyno it for christ sake.... o and y waste money on stock heads....when aftermarket betterflowing heads can be had for nearly the same cost....

408Firebird

and why be a **** when i bought the car like this and want to know it is capable of and learn a little about my car..

igotta355z28

iTrader: (1)

casue im a bitter loney man.. lol just messin with ya but seriously man it gets old fast people asking how much hp should i have and what car would win, or how fast should i go,,,,we live in a real world not a theoretical one, just go race it and see...sorry to pick on ya man......not your fault im fed up with the world lol..

408Firebird

i see were you are coming from but it is kinda hard to race in the snow lol.

And if you look at post 7 i am askin why my heads and cam suck so bad lol

sixpackmtrspts

997's are an ok head for mild performance. they came factory on 350's and 400's from 1971-73. the bigger valves will help. a 268 or a 272 comp cam may be a better chocie though.

for a 408 maybe even a 262 would be a better choice, wont have the nasty sound but it wioll have alot more torque.

i have ran a 262 and a 272 in a 406 in my blazer before, pretty much the same parts you have going there except i had some dart torqer heads. the engine made more power with a 262 cmop cam than it did with the 272, but the 272 sounds more radical.