I'm wanting to look into porting and polishing my heads and also doing a valve job. However, I've never done this and am kind of a slow learner at some of this stuff. So I was thinking of swapping the heads out so I can still drive the car while doing this. My questions are what are some decent budget heads out there? From searching the boards Worlds S/R Tourqers or aluminum vette L98s seem to be the top choices. What specs am I looking for exactly? I've seen various numbers thrown around but not sure what all of them mean. What size cc combustion chamber am I looking for? and lastly, what are good valve sizes? Thanks again guys!

 

What engine are you running, a 305?

If you're running a 305 those are bout your only respectable choicces

With the 305 having a small bore the valve size becomes an issue because of how close the valve can be to the cylinder wall. If its a 350 your choices are unlimited but i personally am a fan of the aluminum L98's, as recently brought up in another post that people often overlook is the S/R torquers are "STOCK REPLACEMENT" dont expect much from them..

If you have access to the L98's go for them.

As far as porting, have fun, it takes a looooooooong time and can get annoying quick

Aluminum is 99999999x easier/funner to port, cast is just a beeeyatch

 

Would cast iron l98 heads bolt up?

 

Whoa you're from salem

yay, more people from oregon, we're scarce

 

Yup oregon is pretty nice to me Been getting some GREAT T-top weather lately too! What part of the west are you from? And just in case I get lazy, about what could I expect to pay a machine shop to do a valve job and some porting/polishing?

 

Porting/polishing can cost upward of $300

valve job.. depends on the place


I'm in southern oregon, good buddy lives up in salem.

 

Yeah the Heads will bolt up, But the 64cc COmbustion chamber compared to the 305's 58cc Chamber will Kill your compression. Not a good idea.

the Aluminum L98 heads have a 58Cc Chamber, wich will retain compression.

However, The general Rule with aluminum heads is you need 1 point more compression to make comperable power to Cast heads with identical flow charactoristics,

Aluminum also can Tolerate approximate 1 more point compression than Cast With similar conditions before detonation, So it kinda works out.

Either way, Just bolting the L98 heads on, cast or ally, is not exactly ideal.

 

What would be ideal then? :hail: