ENFORCER24

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

formula31

[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.

formula31

Now I have a question, 496 exhausts work on a 454? I thought they were a different animal.

jeff1000man

I know the 525 is a different animal. I don't know about the 496. All my 496's are stroked 454 carbed.

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

kennyo

I lost a seat and fragged a brand new engine. I'm with Jeff on this one.

ECeptor

They do work just fine...have 2 season's on my "hybrid" with no problems. You will have to be creative with the plumbing, but with a trip or two to the hardware store for elbows and t's it's an easy set up.

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.

ECeptor

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!

ECeptor

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?

ECeptor

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?

jeff1000man

It adds unnecesary stress to the valve train. Also he will have to buy another set next year when he builds his new engine. I would got the more conservative route and use a bigger camshaft when the time is 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.