What would be the correct factory installed 4 barrel carburetor for a 68 327 engine?.....Also, what would the cfm rating be?
327 Carburetion
Badbird
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WOW!!.....750 CFM!!.....Alrighty then, thanks:thumbsup:
And fwiw, the old 350hp/327, L-79 engine in the '66 Duece was only a 585 cfm Holley!!
Plus the 302 Z-28 engine ran either an early 3310-1 780 cfm type or a later 3310-2,-,- 750 type vacuum secondary carb fine!!
JohnZ, how far off am I b/c it's been a while on this???
pdq67
Plus the 302 Z-28 engine ran either an early 3310-1 780 cfm type or a later 3310-2,-,- 750 type vacuum secondary carb fine!!
JohnZ, how far off am I b/c it's been a while on this???
pdq67
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7,796 Posts
BadBird, That doesn't mean YOU should run another brand of 750 Carb. The Q-jet has small primary's that give it excellent driveability. The Q-jet is what they call a spreadbore design. The secondaries are larger than a Holley 750 CFM carb. and the primaries are smaller than a 600CFM Holley carb. Most Holley's and edelbrock's etc. are a Square bore which means your primarys and secondarys are the same size.
An old 1850 Holley 600cfm vacuum secondary 4-barrel on their 300-36 true high-rise intake will turn a 327 right on, imho!!
Add headers and a 268 to 272 cam for about 9.75 to 1 CR using flat-tops and 64 cc chambered medium valve heads and either the .015" or .020" thick shim headgaskets and hold on!!
pdq67
Add headers and a 268 to 272 cam for about 9.75 to 1 CR using flat-tops and 64 cc chambered medium valve heads and either the .015" or .020" thick shim headgaskets and hold on!!
pdq67
That sounds excellent man!:thumbsup:.....So if one was running a Holley square bore carb then 600 cfm would be the maximum for streetability and performance??
You can go up to a 750 vacuum secondary holley for good streetability and will diliver more power than a 600, the 600 is slightly restrictive. If you feel you are running too rich or too lean you can swap out jets for a larger or smaller size as needed. I think you would be a little happier with a 9.5 CR to run 87 octane.
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7,729 Posts
'67Z's ran a 3910/3911, and '68-'69's ran the 4053; both are vacuum-secondary 4150's, 780-800CFM, WAY more carb than they needed for street operation, but they were released that way to keep the SCCA happy for Trans-Am.
:beers:
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