Also BBC 840 head flow data

[nofear57]

I have a stock 1969 427BBC. The heads are stock Hi-Perf GM1T,#3919840,square port,2.19int and 1.72ex,closed chamber,106.8 combustion chamber.
They have never been ported and I want to keep them that way.Does anyone know what they would flow from the factory,int and ext??Have you seen any tests done on them? I can't find any info. on these heads either.

[russ67chevelle]

ive heard perhaps the best stock iron bbc heads made for racing is the 990 head then the 840...not sure but id say you have a head worth keeping for a good street strip head good luk

[nofear57]

Ya I will be keeping these,I have them on my Blown Pro Street 57' thats in Show Off. But I'm very curious what they flow.

[henny]

Hello
There are quite a few BBC heads on here

http://users.erols.com/srweiss/tablehdc.htm#BBChevy