The car is a 85 Trans am. Right now the car is way down on power. I have bad valve seals and the car smokes all the time. I think I have a bad compression which is why it might be down on power. anyway, I want to get 250 or more rear wheel HP. If I just add headers and port the stock heads can I achieve this? I want the car to run mid 14's or less. Or should I just buy new heads for the 305? If so what kind?

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85 305tpi Trans am
flowmaster exaust
K&N air filter, 4:11 rear gears

 

here's what I'd do.
1)spray the motor and see how long it takes till it gives
2) scrap the 305 and build a 350
3) refer to #'s 1 and 2

seriously, find a 350 ( for about $105 around here) and build that, in the long run you'll like that way more than the 305, and besides it cost the same to build!

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Brandon
"ScreaminDeamin 360"
350 60 over, TRW forged 9.83:1 pistons,Hooker Comp headers, crane cam 216/228 .484/.512, crane 1.6 RR's, ported plenum, home made ram air, 24lb SVO injectors, crane AFPR, all going through 3 inch mandrel pipe and a flowmaster.
New project-89 IROC-Jamex Springs...and thats just about it till summer!
Soon- 6 speed, Pro 5.0 shifter and 4.10's
http://users.argolink.net/bvana

http://ScreaminDeamin.cz28.com

 

laughing gas is fun but i'd rather be blown fix your seals and superchaarge it shove a **** loadd of air down that 305's throat to waake it up

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87 trans am 350 aluminums heads,lt4 hot cam,slp runners,headers,y-pipe,hi flo cat,air foil,ported plenum,t-5 tranny w/centerforce clutch and a 3.27 9bolt,ads strip chip,relocated iat sensor,hollowed maf

14.10@97mph w/2.01 60'

 

Mid 14's? You are not asking for much. My 305 does that, and I didn't have to do that much. I did convert my LG4 to tuned port, but you really can't consider that, because it brings me up the the LB9 playing field, which you may already have. Granted, it made a HUGE difference, but if you already have the LB9, then you were one step aheah, and you might even have a bigger camshaft.

Headers is what put me from a 15.0 to a 14.5. It make a HUGE SOTP difference. I reccomend them to anybody. I also put 3.73 gears in and that helped to. check out the sig.

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If you live in Southeastern US, check us out!
South East Thirdgen

GM Master Tech
ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
3.73 Posi
4wheel Disc Brakes

'97 Bonneville SSE

 

The worse thing you can do is follow the herd. How many guys are out there who take a motor that's on the ragged edge from normal high mileage and throw go faster parts at it? That's a really good way to find the weakest link. Start from the bottom up, literally. If your motor passes a compression check, move to the next component. Cam and heads (which should always be changed in a matched set.) For a 305, which is what I am working on now, I am going with the World Products Torquer 305. It has 58cc combustion chambers and larger valves than stock. It alone is good for an average of +45~+50 hp (latest Camaro Perfomers from Super Chevy.) I haven't decided on a cam yet that should work really well with the Torquer 305. Once the inside of the motor is breathing, go for the headers and siamesed runners. Another problem with bolt ons, is they usually add horsepower by sacrificing torque. But again, first start at the basics and build up. It's more expensive, it takes longer, but it will result in a motor that won't brake on you when you need it most.

Aloha,
Hawaii 5.0
88 Trans Am WS6
305 TPI

 

*exh sys.
*cam
*budget heads(as in used L98aluminum, then port them)
*as many freebies that you can do!!!

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87GTA ,10.5:1,4-bolt 355,afr 190's, super ram ,stock poerted base,58mmTB,24 lb FMS inj. ed wright chip, .510/230 (nr) 1&5/8 hooker shorty's, flow master single 3", 2800 ameri-torque non lk-up, 3.73. best to date with stk 48mm tb and lack of traction in 1st gear netted me a 12.9 @110mph /91 TA daily driver LB9 A4 2.73,

 

All I did was put a comp cams 265 deh, raise my compression to 10:1 and put a flowmaster on it I ran a 14.3 last weekend oh yeah and a corvette servo.