I was wondering if you actually looked at the heads or if you're trying to use some other method to determine which heads are on the motor. If they're 991's they're not much, if any better than your swirl ports.
Carbureted heads and intake on a TBI 350
- Thread starter Stevea100m
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Stevea100m
OBS Enthusiast
I will be getting the casting number after work but if these heads are about the same I may see about getting an L31 and swapping that in with a TBI intake on it.
Stevea100m
OBS Enthusiast
okay i got a better look at the casting number and the full casting number is 3986339 Then below that is A21 77 with a large raised T shape
Stevea100m
OBS Enthusiast
That is what i noticed after i ran the numbers myself. They suposedly had work done to them so im going to measure the valves and see what they come out to. These came off of 355 that a buddy of mine sent out to be built but the more i tear into this thing the more I'mnoticing is its stock
Similar threads
