Ratio rockers and calculated valve lift gains ?

[87BlazeLS]

I see, Kind of confusing. In other words the numbers mean this depending on that.
Well. I think I'm going to save some bucks toward an aluminum head purchase.
And sell off the stockers. Even at $200 to $250 for the pair subtracted from the price new
on the Aluminum heads which I've found some nice ones for right around $850 pair price
That would net me about a $600 to $650 upgrade cost...
Well worth the wait. Lighter engine, more power, Easier to work with....

I do not know what My pistons look like on top. All I can say is it was a GM performance crate 350
330 hp. Gen1 block. 4 Bolt main, cast crank and con rods. I assume the pistons are flattop.
I can dig up some specs and see for sure though.

 

[87BlazeLS]

According to the site where I purchased the motor the engine cyl's have 72cc and dished aluminum pistons.
Cam profile is just under 0.480" on both intake and exhaust. 114 degree center line.

 

[565bbchevy]

let's say if you have 9:1 compression now with a 72 cc head then with no other changes going with a 64 cc head I would estimate around 9.7 to 9.8 comp. and going even smaller with a 58 cc head with put you at around 10.5 or so.
It would depend on the actual compression you have now but I would think a 64 cc would more than suite your needs and still be plenty safe for pump gas while using a performance head gasket versus a factory steel shim to raise compression.
And yes I know all the numbers can be confusing.

 

[87BlazeLS]

Cool info thanks. I'll search for 64cc volume heads. and yes pump gas friendly for sure.
Not ready for anything close to big time like you yet.... 🙂

 

[565bbchevy]

Not ready for anything close to big time like you yet.... 🙂

My first few engine builds and swaps were SBC 350's along with playing with a couple Pontiac engines.
I got a really good deal on my first BBC 454 from the guy I rebuilt it for after he blew the rearend in his Nova and I have had BBC's ever since.

 

[87BlazeLS]

I never got used to seeing the header tube wrapped around the steering shaft as being a good thing.
I have been a mazda Miata owner. and had a chance to see a 93 miata (very similar to mine) With
a 350 corvette motor in it. From the outside it looked stock. But open the hood and man oh man.
It was a work of art. A/C and all. 6 speed, Narrowed ford 9". and this guy was in his mid 60's.
when we left the show he took it up the I 4 ramp headed west and was not letting up on it.
That thing sounded bad azz. and was a sizzler.
I took mine to several shows and no judges were even remotely interested in it. I put countless
hours into the car. At the last show, I told my wife "I should just get a Chevy" And within 1 year
purchased the monte carlo bone stock and not running. Within just 9 months we were at the same show
we had the miata in and took first place, Then next year a second place.
The car is better than that now. Just got to get the paint done. The motor mods are on the plate
so to speak....