Since my engine broke, I had to remove the valves to check for bent valves. I got to inspect the heads.
I had filled the exhaust crossovers with aluminium. I used a Hi-temp adhesive/putty to fine tune the exhaust bowls, because my aluminium shrunk slightly after the pour. This stuff was easy to work with, and it is holding up so far. I bought a 4 oz tube, and I used about half of it do do both heads. I forget what I paid for it, I think it was about $26.00, but I am not sure.
Also if I remember correctly, I plugged "RESBOND 907" into a search engine, and it located a company in NC, which sells if by the tube.
WWW.COTRONICS.COM (712) 646-7996
Good luck and happy racing...
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1969 Firebird, Tx3-455/468 machined by CVMS
E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid
850DP on E-85 by Eric Niefert/T2 1" plastic spacer
T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400
1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine)
https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be
1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine)