Porting L98 heads and flow #'s???
10-19-2005, 12:11 AM
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Porting L98 heads and flow #'s???
Curious to know what some of the best ported L98 heads flow. I'd like to see someones flow sheet spec's to see how well a set of 128's or 113's flow comparied to aftermarket heads.
10-19-2005, 12:36 AM
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C7 of the Year - Unmodified Finalist 2021
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See my website
10-19-2005, 12:59 AM
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St. Jude Donor '05
Awesome site, some great info there!
10-19-2005, 08:01 AM
#4
1000 86.9
.2000 144.1
.3000 179.3
.4000 215.2
.5000 231.0
.5500 232.3
.6000 242.3
.6500 243.0
imo opinion these are still pretty week for the price of ported, buying new springs, valves etc.......
u can buy trickflow heads from summit racing for just over $1000 U.S. that flow....
.2000 138
.3000 190
.3500 212
.4000 230
.4500 245
.5000 253
.5500 260
.6000 260
btw, good site vader
.2000 144.1
.3000 179.3
.4000 215.2
.5000 231.0
.5500 232.3
.6000 242.3
.6500 243.0
imo opinion these are still pretty week for the price of ported, buying new springs, valves etc.......
u can buy trickflow heads from summit racing for just over $1000 U.S. that flow....
.2000 138
.3000 190
.3500 212
.4000 230
.4500 245
.5000 253
.5500 260
.6000 260
btw, good site vader
10-19-2005, 10:12 AM
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St. Jude Donor '05
Maybe a little weak compared to modern heads, but 230/240 cfm is plenty for a TPI. If the intake and exhaust can't keep up with those #'s then having a head that flows any more is a waste.
10-19-2005, 11:34 AM
#6
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Originally Posted by cuisinartvette
Maybe a little weak compared to modern heads, but 230/240 cfm is plenty for a TPI. If the intake and exhaust can't keep up with those #'s then having a head that flows any more is a waste.
As said for a TPI, The question IMO then becomes if you are considering upgrading intake, cam etc.etc., If so 113's may not support the additional mods. in your plans.
10-19-2005, 11:55 AM
#7
Originally Posted by cuisinartvette
Maybe a little weak compared to modern heads, but 230/240 cfm is plenty for a TPI. If the intake and exhaust can't keep up with those #'s then having a head that flows any more is a waste.
i agree as well, btw, what does a stock runner in a SR flow?
10-19-2005, 12:03 PM
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St. Jude Donor '05
Originally Posted by 88BlackZ-51
i agree as well, btw, what does a stock runner in a SR flow?
199 stock base
181 stock base/runners
Edit-oops, those are stock TPI #'s.
SR (Accel base)232
Don't have any #'s for SR base/SR runners
Last edited by cv67; 10-19-2005 at 12:06 PM.
10-19-2005, 12:06 PM
#9
Originally Posted by cuisinartvette
203 runners only
199 stock base/runners
199 stock base/runners
is that SR #'s or stock TPI runners #'s.
i heard that the SR flowed 240cfm per runner with the accel base.
btw, i think i will have to build a 383. a 400 block is really rare in my parts, and i think thats all most too much torque for my 4+3 if you know what i mean.......time will tell! by the sounds of it, i will need to get the SR ported out to flow as much as my heads.
10-19-2005, 12:12 PM
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halleleujah.
flow numbers:
CFM---Brand
203 Stock runners only
242 Accel runners
199 Stock base
232 Accel base
216 Accel base/stock runners
232 Accel base/Accel runners
243 Accel base, extrude hone Accel runners
181 Stock base, runners
edit: these were stolen from a previous post by cuisinartvette
flow numbers:
CFM---Brand
203 Stock runners only
242 Accel runners
199 Stock base
232 Accel base
216 Accel base/stock runners
232 Accel base/Accel runners
243 Accel base, extrude hone Accel runners
181 Stock base, runners
edit: these were stolen from a previous post by cuisinartvette
Last edited by Red Tornado; 10-19-2005 at 12:14 PM.
10-19-2005, 12:21 PM
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Dec, '98 "Hot Rod" ran an article on EFI and gave some interesting flow numbers (taken at 28" of H20):
cfm.....base & runner
199.....stock & stock TPI
233.....Accel & accel TPI
240.....Accel & SR
267.....Accel & Accel TPI, extrude honed
From these numbers and heads flow numbers I can draw several conclusions:
1-stock TPI is inadequate with modified heads...big surprise
2-fully ported 113 heads will flow enough for even the SR intake
3-when using aftermarket heads it would be beneficial to have the base extrude honed (btw, the SR alone flowed 289cfm).
Now, flow numbers aside, the 113 heads have one major draw back which is that they are thin so that only limited milling can be done.
On the plus side they do have excellent swirl and the relatively small runner volume makes for geat velocity, both needed for good low end torque and efficiency.
I feel a good avenue is to port your own 113s, having them flowed as you proceed and CCing the runners as well to assure consistent work.
cfm.....base & runner
199.....stock & stock TPI
233.....Accel & accel TPI
240.....Accel & SR
267.....Accel & Accel TPI, extrude honed
From these numbers and heads flow numbers I can draw several conclusions:
1-stock TPI is inadequate with modified heads...big surprise
2-fully ported 113 heads will flow enough for even the SR intake
3-when using aftermarket heads it would be beneficial to have the base extrude honed (btw, the SR alone flowed 289cfm).
Now, flow numbers aside, the 113 heads have one major draw back which is that they are thin so that only limited milling can be done.
On the plus side they do have excellent swirl and the relatively small runner volume makes for geat velocity, both needed for good low end torque and efficiency.
I feel a good avenue is to port your own 113s, having them flowed as you proceed and CCing the runners as well to assure consistent work.
10-19-2005, 12:25 PM
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St. Jude Donor '05
edit: these were stolen from a previous post by cuisinartvette
I stole them back as I lost most of them
I originally stole them from 65Z01
I stole them back as I lost most of them
I originally stole them from 65Z01
Last edited by cv67; 10-19-2005 at 01:08 PM.
10-19-2005, 12:58 PM
#13
Originally Posted by Hot Rod 90
halleleujah.
flow numbers:
CFM---Brand
203 Stock runners only
242 Accel runners
199 Stock base
232 Accel base
216 Accel base/stock runners
232 Accel base/Accel runners
243 Accel base, extrude hone Accel runners
181 Stock base, runners
edit: these were stolen from a previous post by cuisinartvette
flow numbers:
CFM---Brand
203 Stock runners only
242 Accel runners
199 Stock base
232 Accel base
216 Accel base/stock runners
232 Accel base/Accel runners
243 Accel base, extrude hone Accel runners
181 Stock base, runners
edit: these were stolen from a previous post by cuisinartvette
so a stock SR flows 232 cfm per runner(accel base)? and if my heads flow 260cfm, that means the SR lower and upper will need ported?
10-19-2005, 01:10 PM
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St. Jude Donor '05
Flows 260 at what lift? Depends on the cam run. IMO porting the SR would be a good idea but should be fine w/o it.
You don't want to kill of low-mid-lift #'s to get an impressive .600 lift #
Its a street car.
You don't want to kill of low-mid-lift #'s to get an impressive .600 lift #
Its a street car.
10-19-2005, 01:14 PM
#16
Originally Posted by cuisinartvette
Flows 260 at what lift? Depends on the cam run. IMO porting the SR would be a good idea but should be fine w/o it.
You don't want to kill of low-mid-lift #'s to get an impressive .600 lift #
Its a street car.
You don't want to kill of low-mid-lift #'s to get an impressive .600 lift #
Its a street car.
at .550 lift, i will prob be using the 219.
10-19-2005, 01:56 PM
#18
One thing you need to do is quit looking at the max flow numbers. Start looking at the midflow numbers. How many degrees of the cam are at max lift compared to .300 or .400 lift?
For the $$$ you're going to spend I bought the trickflows, sold my 113 and ended up having a whopping $750 in a new set of heads. You are probably going to spend close to that porting the stock heads and still have a head that doesn't flow as well.
For the $$$ you're going to spend I bought the trickflows, sold my 113 and ended up having a whopping $750 in a new set of heads. You are probably going to spend close to that porting the stock heads and still have a head that doesn't flow as well.
10-19-2005, 02:42 PM
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Rick, take a look at the comment on the SR alone, it will flow enough for those TFS heads. It's the Accel base that could stand the porting to more closely match the heads & SR. So you might benefit from having the Accel base ported.
One reason for chosing heads with small runners and hi flow is to maintain velocity and so not lose torque at lower lifts. This is in fact what properly ported 113s bring to the table.
One reason for chosing heads with small runners and hi flow is to maintain velocity and so not lose torque at lower lifts. This is in fact what properly ported 113s bring to the table.
