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post #1 of 2 (permalink) Old 12-08-04, 08:21 AM Thread Starter
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Join Date: Apr 2004
Posts: 234
extractor gain?

what should i expect to gain from adding a set of headers?/extractors? to this
aprox combo as follows
wieand x elorator intake...........650 holley or 425 impco
+30 flat tops
514 lift cam lots of duration
mallory dizzy
2v quench heads
roller timing set
roller rockers 1.73
c4 auto
and wich style headers would work best?
i may run this on straight lpg or maybe just straight petrol

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post #2 of 2 (permalink) Old 12-08-04, 02:23 PM
74 XB Fairmont
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Join Date: Sep 2001
Location: Cranbourne, Vic
Posts: 5,113
Re: extractor gain?

I'm assuming it'll be using a vac sec carb or gas. I suggest Tri-Y not that 4-1's would hurt. 1 5/8" primaries is what they'll have until you got 4-1. Power gains depend on other things like head work, exhaust, camshaft, carb etc. Mine picked up 50rwkw when going Tri-Y->4-1's. Short shory is it was really strangled. Still is due to the triple flow mufflers I have.


XB Fairmont (street car) 11.07@123.02mph.
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