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318 head flow #2608835
01/19/19 12:35 AM
01/19/19 12:35 AM
Joined: Jul 2012
Posts: 424
Washington
skrews Offline OP
mopar
skrews  Offline OP
mopar

Joined: Jul 2012
Posts: 424
Washington
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.

Re: 318 head flow [Re: skrews] #2608965
01/19/19 01:44 PM
01/19/19 01:44 PM
Joined: Jan 2003
Posts: 14,473
So. Burlington, Vt.
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fast68plymouth Offline
I Live Here
fast68plymouth  Offline
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So. Burlington, Vt.
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
Re: 318 head flow [Re: skrews] #2609075
01/19/19 06:28 PM
01/19/19 06:28 PM
Joined: Nov 2006
Posts: 1,454
oklahoma
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forphorty Offline
pro stock
forphorty  Offline
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oklahoma
Skrews, as I know you are a member there, you have probably already seen this. https://www.forabodiesonly.com/mopar/threads/318-head-porting-for-the-average-joe.167865/

Re: 318 head flow [Re: forphorty] #2609418
01/20/19 05:45 PM
01/20/19 05:45 PM
Joined: May 2005
Posts: 1,931
Apollo, PA.
B1MAXX Offline
top fuel
B1MAXX  Offline
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Posts: 1,931
Apollo, PA.
I had this re-manufactured 318 head laying around,and my flowbench was already set up for a small block. I threw it on. I couldn't get to.500 lift, Went bind at .495. This was a re-manhead that was all stock from a local shop.

100_1416.JPG100_1417.JPG100_1418.JPG100_1419.JPG
Re: 318 head flow [Re: skrews] #2609567
01/20/19 10:04 PM
01/20/19 10:04 PM
Joined: Jan 2003
Posts: 14,473
So. Burlington, Vt.
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fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
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Joined: Jan 2003
Posts: 14,473
So. Burlington, Vt.
There you have it up


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: 318 head flow [Re: skrews] #2609768
01/21/19 09:36 AM
01/21/19 09:36 AM
Joined: Apr 2008
Posts: 117
Aus
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hysteric Offline
member
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Joined: Apr 2008
Posts: 117
Aus
Originally Posted By skrews
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.

Re: 318 head flow [Re: skrews] #2610169
01/21/19 11:43 PM
01/21/19 11:43 PM
Joined: Jul 2012
Posts: 424
Washington
skrews Offline OP
mopar
skrews  Offline OP
mopar

Joined: Jul 2012
Posts: 424
Washington
Thanks for the replies.







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