what does everyone think about 350 heads on a 305 pros cons?

 

Depends on the heads. Flow would have to outweigh the loss in compression.

 

Depends on heads, pistons, cam and material. What are your ideas?

 

go with l98 heads from a camaro (64cc combustion chamber) with lt1 cam and maybe 1.6rr.... Most tell me the heads wouldnt be worth it.

not trying to hijack his thread just throwing an idea out to be debated until he brings up his ideas

Shawn

 

the problem is with 64cc chambers, you compresion ratio takes a pretty seroious hit. the other thing to be concerened with is the valve sizing/spacing. most 350 performance heads have large valves hat will not clear the tiny bore of the 305.

l98 heads have basicly the same port design as the 416 305 castings do, only real diffrence is CC size. the 416's also respond VERY well to porting.

 

cant you go with a very thin head gasket like the felpro 1094 with .015" ? i dont think the loss in compression would drop so much.

nebu.

 

factory used .015" shim gaskets.

with everything the same, the diffrence of 6cc on a 305 would drop you from 9.3:1 to about 8.65:1

 

hm, do you know how much loss in hp that would be?

btw, does someone know the piston down bore @ tdc from a 91' 305?

 

Do you just want the bore and stroke of the 305? The bore is 3.74 and the stroke is 3.48.

 

The Dyno2000 Software needs the Piston down bore to calculate the compression ratio.

 

you could also try 081 305 TPI centerbolt heads. With some porting they should flow pretty good. Also, you could always have 350 heads milled to retain some compression

 

I'd vote for the milling if you really want 350 heads on the 305.

9.3 to 8.65 is quite a drop. Anyone know if the 350 heads flow that much better than the 305's?

-chuck

 

the 350s do have the bigger 1.94" intake valves as opposed to the 1.84" valves of the 305 heads.

 

valve changes are not a big deal, the port casting between the 416's and the l98's is the same. if you ned the head that much, you will likely have to have your intake manifold done also. keep that in mind.

 

The stock compression ratio for your car is 9.3:1. There are many factors in determining the correct compression ratio when you change parts.

 

It is this value, which i need to complete the calculation. i hope dd2k is accurate

 

the heads i picked up are 14102193 heard they are from 350 tbi swivel port heads i do plan on doing small port work to the intake and exhaust would it be possible for me to get the heads milled so much that my compression would go up to say 9.5 1 and does anyone know the specs on these heads compared to the stock heads?

 

i think it is .030" deck height (probably varies from the factory a little" but don't we also have dished pistons?

 

It is not worth it. You can get a set of 305 TPI heads for $100 and will match the cost of all the machine work you are going to have to do on those swirl port heads.

 

what is the cc rating intake port sizes?

 

How much lift will the 416 heads support?
I have an LT1 cam, and the 416's I'm getting ready to start protiing, just curious if I could go with more lift.
Thanks Scoty

 

dont mean to jack your post but i need heads for my car and ive got 300 bucks to do it.anyone know.its the 305 tbi i got and i got a LT1 cam waiting so if the heads had the springs and 3angle valve job that would be great.

 

.480 max but a little machine work and you can go past .5XX with ease.

Read the heads section on the sticky.

https://www.thirdgen.org/techbb2/sho...hreadid=227281