l98
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Joined: Nov 2004
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Car: 1986 Camaro
Engine: zz4 350 w/mods
Transmission: 700-R4 W/Shift kit
Originally posted by pasky
Ditch the TPI
.
No seriously, just gasket match them.
Ditch the TPI
.No seriously, just gasket match them.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Iguess you need to be more specific.
The areas that typically need work are the bowls under the valve seats, and exhaust ports. If you do the "normal" do-it-yourself porting job, it will help them quite a bit. Shaving won't help unless they need a "clean-up" for flatness sake.
I had a buddy who sent his ZZ3 heads (same thing as ZZ4) off to North Carolina for CNC porting, then to California along with the Bigmouth base, runners, and plenum for extrude honing. That's probably a bit of overkill, but that's what he did.
The areas that typically need work are the bowls under the valve seats, and exhaust ports. If you do the "normal" do-it-yourself porting job, it will help them quite a bit. Shaving won't help unless they need a "clean-up" for flatness sake.
I had a buddy who sent his ZZ3 heads (same thing as ZZ4) off to North Carolina for CNC porting, then to California along with the Bigmouth base, runners, and plenum for extrude honing. That's probably a bit of overkill, but that's what he did.
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Joined: Nov 2004
Posts: 122
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Car: 1986 Camaro
Engine: zz4 350 w/mods
Transmission: 700-R4 W/Shift kit
Originally posted by five7kid
Iguess you need to be more specific.
The areas that typically need work are the bowls under the valve seats, and exhaust ports. If you do the "normal" do-it-yourself porting job, it will help them quite a bit. Shaving won't help unless they need a "clean-up" for flatness sake.
I had a buddy who sent his ZZ3 heads (same thing as ZZ4) off to North Carolina for CNC porting, then to California along with the Bigmouth base, runners, and plenum for extrude honing. That's probably a bit of overkill, but that's what he did.
Iguess you need to be more specific.
The areas that typically need work are the bowls under the valve seats, and exhaust ports. If you do the "normal" do-it-yourself porting job, it will help them quite a bit. Shaving won't help unless they need a "clean-up" for flatness sake.
I had a buddy who sent his ZZ3 heads (same thing as ZZ4) off to North Carolina for CNC porting, then to California along with the Bigmouth base, runners, and plenum for extrude honing. That's probably a bit of overkill, but that's what he did.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The advantage is they flow a lot better than they did before. I don't recall hearing flow bench data, however.
The problem is by the time you do that, you'll have spent as much as you would on out-of-the-box aftermarket heads that flow just as well, and have more performance potential in them.
The problem is by the time you do that, you'll have spent as much as you would on out-of-the-box aftermarket heads that flow just as well, and have more performance potential in them.
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