troutkilla

How goes it fellaz,I'm gonna build a 427ci.stroker using a World Castings Motown block as a starting point.I need some input on some emissions legal heads that will flow good and pass the sniffer.....thanks 87 WS6 T56 T/A

Russ-So Cal

Trickflow 23* heads are carb legal. If you have an unlimited budget, AFR makes emissions legal heads that outflow anything.

camaroguy99

I'm not to clear on Wa. smog laws but in cali you can only but the same engine in that came with a car of the same year. so a 427 in a thirdgen wouldn't fly. Just giving you a heads up do you don't get in trouble once it's in.

To answer your question, I've heard the trick flows are an excellent head for SBC but haven't heard anything on BBC. If you do go with them then you have to get the R series heads. they don't make a 23* for BBC. World products heads BBC heads are very good for the money you might want to check those out also.

Kevin91Z

iTrader: (1)

He's making a 427 small block, not a big block.

There are tons of smog legal heads, like AFR and Trick Flow.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
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-=ICON Motorsports=-

camaroguy99

427 small block my ***

[This message has been edited by camaroguy99 (edited August 13, 2001).]

jcb999

the same issue still applies. This thing will not pass emission. neither on paper bc of the incorrect motor nor anytype of sniffer test. A motor that size will not put out anywhere near the same NOX and CO numbers a 350 would (even with a stock cam)

Do like RB does, put your stock motor back in for the test and then go back home and change it out to the perf one.

[This message has been edited by jcb999 (edited August 13, 2001).]

Russ-So Cal

Actually, it might be able to pass if it is done right. Externally, the engine looks the same, and the only difference from the outside is in the lifter valley which would require the intake to be removed to even see it. Guys get 383 stroker motors to pass in Cali all the time. A good set of smog legal heads, and careful tuning will take care of it.

jcb999

the displacement of a 350 and 383 are not that far off from a sniffer standpoint. You could get the sniffer to think a 383 is smaller. 10percent additional displacement insignificant. 22+percent is not. you will have to have it extremely lean, and hot. It will not pass NOX limits like that.

mcconahay37

iTrader: (3)

He said he's using the World Castings Motown small block. This is a redesigned SBC that can be made a 427, and the reason it can't go bigger is because there aren't any pistons available to do it.

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82 Camaro:
350
Erson cam, ported heads,Comp Cams 1.6:1 rocker arms
Edelbrock Performer RPM intake, Holley 600
Crane Hi-6 ignition, Accel supercoil
TH350 tranny with 2500 stall.
Eibach Pro Kit
SLP 1 3/4" headers

camaroguy99

Ok, sorry I didn't realize there was a "427 small block". I guess I have to read up on these things beofre I open my big mouth. Would a regular SBC head fit on that block? I would think the bore would have to be larger and therefore a larger combustion chamber in the heads. Once again this is me thinking out loud so feal free to set me strait, again.