049 Bbc Heads
#21
Registered
Thread Starter
Join Date: Aug 2006
Location: Colonial Beach VA
Posts: 629
Likes: 0
Received 0 Likes
on
0 Posts
i'm loving all the info i'm getting here , keep it coming
for this year i'm not touching the bottem end , just the heads and intake and exhaust , exhaust is gonna be 496 mag ho , heads will be the 049 gm heads , not sure if i'm gonna up the valve size or not , intake is up in the air (watching ebay) , and for at least the spring test and tune i'm gonna keep the stock carb , but may spring for a holley marine at some point this summer
for this year i'm not touching the bottem end , just the heads and intake and exhaust , exhaust is gonna be 496 mag ho , heads will be the 049 gm heads , not sure if i'm gonna up the valve size or not , intake is up in the air (watching ebay) , and for at least the spring test and tune i'm gonna keep the stock carb , but may spring for a holley marine at some point this summer
#22
[QUOTE=jeff1000man;2420309]. Keep in mind also that the 049 is not a 188cc chamber head. It is closer to a 115. A lot of guys think that it is the same chamber as the 088 square and it isn't.
Most guys I talk to recomend staying away from ANY vavle seat instalations. This is asking for trouble. When that constant high rpms causes that seat to come out and get lodged between the valve and the head, it wil hand grenade the whole engine.
QUOTE]
Every one I have is 119-121 cc. And I measure them. If they are less, they have likely been cut. Dont run them without seats, the valves will pound there way in unless you can find some 60's vintage leaded gas. Properly installed seats will be just fine.
Most guys I talk to recomend staying away from ANY vavle seat instalations. This is asking for trouble. When that constant high rpms causes that seat to come out and get lodged between the valve and the head, it wil hand grenade the whole engine.
QUOTE]
Every one I have is 119-121 cc. And I measure them. If they are less, they have likely been cut. Dont run them without seats, the valves will pound there way in unless you can find some 60's vintage leaded gas. Properly installed seats will be just fine.
#24
Registered
Platinum Member
As far as the seats. It takes quite a few hours to wear those valves out. hundreds. It only takes about 10 minutes and a little detonation from some bad gas to loose a valve seat.
I havn't had any problems leaving them alone (YET).
Save your money and run them one season and save your money for a really good set of AFR's for next year when you build the whole engine. The way the price is coming down on them, they will be 2k a set next year.
Good luck
Last edited by jeff1000man; 01-25-2008 at 02:01 PM.
#26
Registered
Join Date: Jun 2004
Location: Wichita, KS
Posts: 476
Likes: 0
Received 0 Likes
on
0 Posts
If you are working on the engine while it is in the boat, the 496 heaters are 100 times easier to install due to their much lighter weight.
Last edited by ECeptor; 01-25-2008 at 07:36 PM.
#27
Registered
Join Date: Jun 2004
Location: Wichita, KS
Posts: 476
Likes: 0
Received 0 Likes
on
0 Posts
That's my long range plan also. Actually it is to sell my current engine outright and build up a 502 around AFR 305 heads.
BTW, Jeggs has AFR305's for $2k right now!
#28
Registered
Join Date: Jun 2004
Location: Wichita, KS
Posts: 476
Likes: 0
Received 0 Likes
on
0 Posts
1.7 is standard for BBC. Buy a good rocker like the Crane Gold and you can use them for your next engine. You need to have you machine shop set them up for around 90-100 lbs closed pressure for flat tapet hydraulic. I always use a Manley or a Comp depending on what I am looking for.
Depending on your current exhaust set up, You will need a notched valve cover to clear the manifold or the header. You will have to go with bigger valve cover to clear the new rockers and studs. Those heads use the 7/16 stud. Get the longer stud so your set screws are not buried so far down into the nut and you will have more threads ffrom the nut holding onto the stud.
Depending on your current exhaust set up, You will need a notched valve cover to clear the manifold or the header. You will have to go with bigger valve cover to clear the new rockers and studs. Those heads use the 7/16 stud. Get the longer stud so your set screws are not buried so far down into the nut and you will have more threads ffrom the nut holding onto the stud.
Any reason not to go with 1.8 ratio rockers if upgrading? That would give him a little bit more rpm's and therefore power, right?
The 330's cam is 214/218° @ 0.050" & 0.460/0.480" lift. Using the 1.8 rockers would make it "act" like a 227/231° @ 0.050" & 0.487/0.508" lift, right?
#29
Registered
Join Date: Jun 2004
Location: Wichita, KS
Posts: 476
Likes: 0
Received 0 Likes
on
0 Posts
One last thought - everything I've read show's the Edelbrock Perfomer RPM and RPM AirGap to be the best intakes for engines like this one. Can anyone produce data or an article stating otherwise?
#30
Registered
Platinum Member
Any reason not to go with 1.8 ratio rockers if upgrading? That would give him a little bit more rpm's and therefore power, right?
.\
The 330's cam is 214/218° @ 0.050" & 0.460/0.480" lift. Using the 1.8 rockers would make it "act" like a 227/231° @ 0.050" & 0.487/0.508" lift, right?
.\
The 330's cam is 214/218° @ 0.050" & 0.460/0.480" lift. Using the 1.8 rockers would make it "act" like a 227/231° @ 0.050" & 0.487/0.508" lift, right?
As for your AFR set up, You will be better off ordering you heads from builder/ supplier because the upgrades that you will need to do to those stock heads or longevity will outweight what the cost will be from us.
Example - Inconnel valves, re doing the springs to match the cam, and hard annodizing the head to figt corosion.