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Author Topic:   305 heads
AC156
Dirt Full Roller

Total posts: 46
posted September 16, 2001 04:45 PM
I am in the process of building a 350 sbc to run in my hobby car next year. The engine is a '91 model. It is basically stock. What do you all think about running 305 heads? I know that they will raise the compression. We have to run a 500cfm 2 barrel carb and exhaust manifolds. I turn about 6200-6400 rpm.

Also, what would be a good cam. Cams have to pull 18 inches of vac at 700rpm. Track is a dry slick banked 3/8 mile.

jammin
Dirt Administrator

Total posts: 3324
posted September 16, 2001 08:04 PM UIN: 16262997
We run some 305 heads on some of our IMCA motors..they work fine. If your gonna turn them up, you have to do some port work, but in your RPM range, you should do fine. Sometimes on the heavier cars, you need a little more air flow to turn a few rpms more to make them work effectively. I dont know your rules, but the cam and heads have to work together, if your on a cam rule, then the work on the heads isnt going to make as much of a difference.

jammin

AC156
Dirt Full Roller

Total posts: 46
posted September 18, 2001 05:58 PM
Would I be better off to run the 350 heads that are on the motor?

BK19
Dirt Maniac

Total posts: 101
posted September 18, 2001 06:35 PM UIN: 40696038
what heads are on the motor?

AC156
Dirt Full Roller

Total posts: 46
posted September 18, 2001 08:09 PM
Stock heads are on the motor now. The heads that came on the engine from the factory.

Pit Bull
Dirt Full Roller

Total posts: 43
posted September 18, 2001 10:54 PM
We ran 305 heads on a budget bomber motor last season with good results. It had a 500 cfm 2 barrel and cast iron exhaust manifolds. We did some port work on the heads, and stuffed 1.94 and 1.6 valves in them with the z28 springs. The cam we used was a speedway hydrauic cam, .480 and .494 lift, 228 and 234 duration and 106 separation. This is an excellent dry slick motor; but i dont know what it will pull for vacuum...

Hope this helps...

ryan
Dirt Roller

Total posts: 21
posted September 19, 2001 12:11 AM
What are the casting numbers??? I don't have my book with me but someone should know of a website to look up your numbers.

jammin
Dirt Administrator

Total posts: 3324
posted September 19, 2001 06:02 AM UIN: 16262997
Use the search on the forum, you will find all that information right here...

jammin

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