Hi All I'll be filling up the hot exhaust crossovers on a set of 430's. Just curious on which brand of fill you guys use. Anybody have any bad experiences doing this at homeo No: thank Marc
I've heard of guys melting down an old set of pistons to fill the exhaust crossovers. Block Filler....as in Hard Blok....don't think you can use stuff like that.
I drilled the cross-overs larger on a set of heads and pressed steel rod in the holes. The ends of the rods were cut to match the end of the drill bit. I then blended the part of the rod that stuck into the port to the walls. I've never heard of using block fill before.
I believe JW drills and taps those holes for an NPT plug. I've seen that done on other applications too. I saw a set of Olds 455 heads that had old forged pistons melted into both the crossover passageways and the floors of the exhuast ports. By the time the guy was done, they resembled what the Edelbrock heads look like(stock Olds heads are awful on the exh. side - especially the floor where the header flange is). After ALOT of porting - they looked great!:TU:
Thanks for all the reply's guys. I guess I was misinformed about using block filler. I really got to buy Steven Dove's book. I like GSXMEN's idea about tapping the holes and using threaded plugs:TU: . Where would I be without this site AMEN!:beer
Hi Guys, Tapping those holes for threaded plugs addresses the heat to the intake situation but it doesn't do squat for the problem of the center exhaust ports being down on flow compared to the outer ports. Look into the exhaust bowls and you'll see what I mean. When you fill these all the way you can then bowl port to re-contour to get the flow they shoud have compared to the outers.:Brow: JMHO here..... :TU:
Get piece of mild steel same diameter of factory drilled holes measure depth of hole and cut piece 3/4's of an inch shorter to allow room for JB weld on intake side of plug carefully drift a peice of mild steel all the way into the bowl untill it bottoms out on the lip of the hole,stake plug on intake side and fill with JB weld,blend other side into bowl.works great.Chris
Has anybody ever had these holes welded shut at the exhaust bowl? Is there enough room to do so? I've seen guys weld a cracked block and heads with a stainless rod that worked well. Can this be done?o No:
JB Weld! I am almost afraid to tell you how I did it, but the advice came from the machinist doing my block. I used tin foil to temporarily block the holes and hold the JB Weld. I used at least 3 packages of the stuff and filled in until I was almost flush with the intake flange on the head. That was over 10 years ago. No problems! (well, except for cold idle)
I drilled the existing holes out (they weren't round or true) and interfered lengths of ally bar into the hole - dressed the intake face flush and ground the bar protruding into the exhaust passage back until I got a nice flowing shape which blended into the exhaust passage. Seems to work fine. Unlike my choke mechanism... Dave
Hmmm....JB weld sbbuick That's sounds like a hell of a good idea. I was thinking about doing the frost plug thing but I don't trust the thin plugs to the extreme heat produced from the chambers. Any specific type of JB weld I should use?? 10 years and no problems....I'll give it a try:TU: thanks Marc
Sorry for the late reply. I used the older "slow" JB Weld, not the quick weld. Should be available at most auto parts stores. Mix it up and slop it in there! I really like the fact that the intake is so much cooler, and so does my engine, it shows appreciation by giving me more Power to Whoop Butt!
