I am playing around on my desktop dyno and was wondering if anyone knew the airflow specs on a set of stock Vortec 454 heads?
If not, the specs for large oval-port heads should be close.
THANKS!

POOR AT BEST!

Hey DonMan,

Are you going to put bigger valves in those heads?

Post some numbers if you don't mind.

Those aren't correct, those #'s indicate they flow worse than stock peanut ports. I'm betting those are the #'s for SMALL block vortec heads.... those would be much more like what a decent small block head would flow.

Madmax is right, the numbers are likely for small block heads.

The link is good sutphen30, lots of good info, no L-29 heads though.

Donman, you may want to try numbers in between the GM 049 and the WP Merlins.

Are you running numbers for the ZZ502 cam ???

I need to buy that desktop dyno...

I`m not sure what valves I`m going to run right now, hence the desktop dyno.....
My 454 went kablooey so I`m considering building a 496 shortblock, possibly a 540....
I know these heads aren`t that great, but I already have them and really can`t afford better heads right now. Just hoping to get a little good from them.

Yes, I`ve heard these heads are better than 049`s but not as good as anything aftermarket.

So, OK give me flow numbers for 049 and Merlins.

Actually I`m running the numbers using the Crane 168741.
.610/.632 236*/244* 112 LSA

Initially, I`ve seen 537 HP @ 5000
496cid
dual plane
800 cfm

Hey DonMan,

Sorry to hear you 454 went boom

sutphen30 posted a link to the flow numbers from high performance chevy.

Would you mind running the numbers for the ZZ502 cam in a 454?