okay i want to get my compersion up and im going to use a lt1 cam in my 89 formula tbi so wuz wondering how much can i get the heads milled down to raise comperssion on the lil 305.also is that even a possibilty and if so how much do,places usually charge for this.and should i jus find some 305 TPI heads instaed or stick with the tbi 305 heads.

 

Even though I'm a tightwad, I always spend as much as I can on the cylinder heads...this doesn't always mean more money, maybe just shopping around.

Check local engine / race shops / machine shops, alot of times you can find good deals on parts that people never picked up and the shop just wants them gone.

 

Compression isn't the problem on LO3/TBI heads. Swirlports is.

Putting an LT1 cam into an engine with shaved swirlport heads will drive a need for higher octane but will not produce more power.

The first thing to replace on a TBI engine is the exhaust. The 2nd is the heads.

Then you can consider a cam swap.

 

I agree with him. if you want to make your car faster, you have to have a balanced combo. you can only put as much cam through the motor as the rest of the top end can flow. otherwise it would be like splicing in a foot long peice of 4" exhaust between your cat and muffler, while the rest of the system is stock. it ain't gonna work very well....

 

well ive got full exhaust done headers and catback but what should i do with the heads cuz i got the lt1 cam.and im going to put it in.

 

You can run the stock heads without a problem. They are garbage don't get me wrong but they will work. A head swap will make that cam really shine. A cheap solution is a set of 305 TPI heads that can be had for around 100.

 

The heads you want are casting # 081. They're not just TPI heads; they're also on 87-up LG4 and L69 motors. So look in Monte Carlo SSs and base-model (carbed) 87 V8 Camaros and Birds for them too.