CRG Discussion Forum
Camaro Research Group Discussion => Decoding/Numbers => Topic started by: hotz on August 27, 2011, 07:05:46 PM
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hey guys,
Can anyone tell me what the difference is between the 3919840 heads and the 3964291 heads.??. I have heard that the 840's produced more power and are a more desirable number. Is that because the 291 was produced in late 69 and doesn't fit may 69 cars? I have found that the 840's are a bit more $$$. Will the 291 heads make the same power as the 840's? thanks for all of your help.
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The heads are the same :) except 291 had 1.88 exhaust valve and a tapered plug seat and the 840 had 1.72 exhaust and a flat plug seat.