Re: 318 head flow
[Re: skrews]
#2608965
01/19/19 01:44 PM
01/19/19 01:44 PM
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Joined: Jan 2003
Posts: 14,473 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,473
So. Burlington, Vt.
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I haven’t messed with any of those in over 25 years.
From what I recall a stock head was around 160-165cfm, and one with cleaned up ports, valve job, back cut OE valves got you close to 180.
On the 2bbl oval track motors I was building at the time, the rules were any stock la head, 1.88/1.50 valves, no porting.
On those builds, 596 heads with 1.50 ex valves made about 40hp more than 302 heads that had 1.88 intake valves installed.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 318 head flow
[Re: skrews]
#2609768
01/21/19 09:36 AM
01/21/19 09:36 AM
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Joined: Apr 2008
Posts: 117 Aus
hysteric
member
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member
Joined: Apr 2008
Posts: 117
Aus
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What kind of flow numbers have you seen from untouched 318 castings? Particularly 675 castings. What flow bench and test depression did you use? Started in on a set of 675 heads with no intent to flow them when done. Now the wheels are turning and I'm kind of curious as I'm actually putting some effort in them, and didn't do a before test. 1.94/1.6 valves, gasket matched to 340/360 port size, bowl work, short side rework, removing most of the guide boss. Shooting for 210 cfm range with high velocity. My 302's with a 1.9 11/32 valve flow 240+, I would imagine that the 675's would do the same.
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