coppercutlass

So got the car out with the new engine. Ported J heads , Rpm intake, 750 carb , Engle solid lifter cam 560 ish lift 245 ish duration I wanna say. 10.25 to 1 compression, speed pro pistons , nothing fancy. First pass with mufflers ran an 11.82 @110 . Uncorked the exhaust changed the timing set the shift point to kill and it ran an 11.58 @ 113. This combo has more in it.

https://youtu.be/hZT2QXF0eOE

joe_padavano

Nice. I've always said that if you plan to port iron heads, the J heads have more material for you to work with. The "sleeper" value also adds point in my book.

olds 307 and 403

Always good to have multiple engines built, especially when you flog them as hard as you do. The ported J heads on a hot 350 is an interesting combo.

deadeyejedi

How much did you have to shave off the j heads ? And what cc ‘s did you end up at ? I wish I knew how to do porting .

coppercutlass

Heads where 67 CC's I ended up with these heads so I don't actually know how much was milled but when. I cc 'd then 67 was the number

deadeyejedi

thanks 👍

OLDSter Ralph

They were probably milled .050-.060" minimum. Those heads from the factory had 77 to 80 cc's.

Fun71

I have measured BBO heads at 84 ccs.

OLDSter Ralph

And in that case it would take atleast .075-.085" to get down to 67 CC's.

oldsmoboogie

Nice work!

coppercutlass

Thanks. This combo exceeded my expectations already but clearly has more in it comparing time slips. Gotta figure out that 60 ft time.

TimMC

very nice. Good to see life in the SBO.