what is the cc's of the small oval port heads? I though they were 110, but I have a book that says there 118. The book I have is Big Block chevy marine performance. HPBooks by Dennis Moore. I have seen on line were there suppose to have 110 cc's. somebody wrong??

Thanks
Dan

They are mostly all 119 from what Ive measured. Tell us what the casting number is and we can look it up.

In Gen 4 stuff they were both size. The peanut port heads are all 118CC. The Gen V & VI ovals are 110CC, the peanut ( Round) port are 118.

Go get a Chevy High Performance catalog from GM . You will see what I mean from peanut port to oval port. Peanut ports are used in passenger vehilces. Oval port are truck engines

L29 Vortecs are 100cc's, just measured them!

Opps, Im old, my reply was refering to Mark 4 oval ports, peanuts, 781's 049's. I know there are lots of others with smaller chambers that were older closed or semi closed chamber heads. The newer gen 5 and 5 vortecs are smaller as Andy stated. Really need the casting number to be sure.

Edelbrock makes a large oval port aluminum with 110cc.
There are old closed chambered heads out there that are 105-110cc.
Most heads used on Gen IV and Gen V marine engines have 118cc.
Gen VI magnum engines have 118.
Gen VI L-29 454s have the heart shaped Vortecs and measure around 100cc...
I have an extra set of Vortec heads if someone would like them...

I don't have the casting number's, I did at one time and had the heads off. They looked like open chamber heads. the year of the engine is 1987.

They are likely peanut port heads then. 119 cc.

Looks like I can just bolt my 781 and 049 heads on then. All the ports cc out at 118 to 120. I was thinking about useing a steel gasket to get the quench down and increase compression ratio a bit. Looks like about 5 cc's Sound good?

have you tried http:// www. mortec.com