Results 1 to 3 of 3
03-17-2014, 03:46 PM #1
- Join Date
- Apr 2012
- Bancroft IA
thinking 305 heads on my 350.....
Just wondering if anybody has done this recently? I have a 90's TBI 350 with bad head gasket looking to swap for 305 heads for more power. Aside from the mileage difference any other pros and cons to this?
03-17-2014, 04:57 PM #2
You will get a compression gain, but your going to lose flow. All in all, IMO you would be p!ss!ng in the wind...Chuckie!!!
03-17-2014, 05:55 PM #3
That's been a performance upgrade suggestion for a long time. Apparently, the 305 heads increase compression, which increases power output. How much difference it makes, I don't know.
I do know, there was two different 305 heads, one has a smaller combustion chamber volume. It's not much, maybe 6 to 8 cc, but I do know one works very well and the other can cause problems (sorry, I don't remember which one is the best one). The casting numbers will help to identify them, look under the valve covers.Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
Tags for this Thread