RHS 450cid with AllPro Heads - 2days to Install
01-01-2013, 02:06 PM
#21
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Chad at Golen has several big cube LS engines running the 255/271 on 114 and has had great feedback. I would love to see 454cid graph.
01-01-2013, 02:21 PM
#22
I still think cathedrials put out a better power curve.
01-01-2013, 04:02 PM
#23
You would think that would be best on paper. The tight LSA does work better with these type of heads and intake. We tested Brodix heads comparable to his on a 440ci/FAST 102 setup. The wide splits made a crappy power curve compared to thgottee tight split cams. Can't explain it, just works.
I still think cathedrials put out a better power curve.
I still think cathedrials put out a better power curve.
When you say tight split versus wide split is very vauge, what were the lsa/icl on the tighter split cams?
I agree on the cathedral power curve though! TFS265s on this set up would be ****.
Last edited by Sales@Tick; 01-01-2013 at 04:09 PM.
01-01-2013, 09:48 PM
#25
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This is my third engine with no issues using non-rollers and bronze guides.
01-02-2013, 07:50 AM
#26
I did a cam the other month for a guy, 427 with ls7 heads. 226/242 116+4 with a fast intake and the curve was nothing like your describing. Over scavenging a long runner intake making for a better curve is opposite from the results I've gotten from various similar set ups I've done cams for. Not saying it can't, just very intriguing.
When you say tight split versus wide split is very vauge, what were the lsa/icl on the tighter split cams?
I agree on the cathedral power curve though! TFS265s on this set up would be ****.
When you say tight split versus wide split is very vauge, what were the lsa/icl on the tighter split cams?
I agree on the cathedral power curve though! TFS265s on this set up would be ****.
When running the donkey dick size cams you see better results with tight lsa's and valve events that don't carry over from cathedrials. I'm thinking these heads just flow too much and stall.
01-02-2013, 12:26 PM
#27
On the small cams like that it's not noticed. My average cam is 224's on LS7's on 113-115 lsa.
When running the donkey dick size cams you see better results with tight lsa's and valve events that don't carry over from cathedrials. I'm thinking these heads just flow too much and stall.
When running the donkey dick size cams you see better results with tight lsa's and valve events that don't carry over from cathedrials. I'm thinking these heads just flow too much and stall.
OP sorry for hi-jacking your thread!
01-02-2013, 05:11 PM
#28
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01-03-2013, 10:50 AM
#31
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On the small cams like that it's not noticed. My average cam is 224's on LS7's on 113-115 lsa.
When running the donkey dick size cams you see better results with tight lsa's and valve events that don't carry over from cathedrials. I'm thinking these heads just flow too much and stall.
When running the donkey dick size cams you see better results with tight lsa's and valve events that don't carry over from cathedrials. I'm thinking these heads just flow too much and stall.
Peaked at 605ft/lb and 635fwhp. Nothing super crazy, but its a small cam.
over 300ftlb from 2000+
Ive had to detune the ETC to make it driveable off idle.
Richard at WCCH asked for the dyno chart. He ported the heads.
01-03-2013, 01:40 PM
#32
I know it is not apples to apples, as I have Cathedral ports on my 455. Mast 275s with a ported Harrop. My cam is a hyd 255/263 .670/.670 110 and installed at 110. 94 octane pump gas with 26 degrees of timing with 11.1:1 compression.
This was with my actual old Kooks 1 7/8" headers which did not have the merge collector, not a Dyno header. When I finally get it on a chassis dyno, it now has 2" Kooks headers with a 3 1/2" Merge collector, hoping to see a modest gain from them. 10-15 would be nice.
Anyway for comparison. I would have thought the LS7 port would have had more on the top end and the Cathedral ports with more low end torque, which it does in this case.
I think Tony M made around 735 with his 454, all the people saying these should make 800 on pump gas, I do not think it is as easy as that. It has been done, but is not common by any means.
I think the OP has a nice motor there, has nice idle too.
This was with my actual old Kooks 1 7/8" headers which did not have the merge collector, not a Dyno header. When I finally get it on a chassis dyno, it now has 2" Kooks headers with a 3 1/2" Merge collector, hoping to see a modest gain from them. 10-15 would be nice.
Anyway for comparison. I would have thought the LS7 port would have had more on the top end and the Cathedral ports with more low end torque, which it does in this case.
I think Tony M made around 735 with his 454, all the people saying these should make 800 on pump gas, I do not think it is as easy as that. It has been done, but is not common by any means.
I think the OP has a nice motor there, has nice idle too.
Last edited by RAMPANT; 01-03-2013 at 01:50 PM.
01-05-2013, 07:49 PM
#33
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I know it is not apples to apples, as I have Cathedral ports on my 455. Mast 275s with a ported Harrop. My cam is a hyd 255/263 .670/.670 110 and installed at 110. 94 octane pump gas with 26 degrees of timing with 11.1:1 compression.
This was with my actual old Kooks 1 7/8" headers which did not have the merge collector, not a Dyno header. When I finally get it on a chassis dyno, it now has 2" Kooks headers with a 3 1/2" Merge collector, hoping to see a modest gain from them. 10-15 would be nice.
Anyway for comparison. I would have thought the LS7 port would have had more on the top end and the Cathedral ports with more low end torque, which it does in this case.
I think Tony M made around 735 with his 454, all the people saying these should make 800 on pump gas, I do not think it is as easy as that. It has been done, but is not common by any means.
I think the OP has a nice motor there, has nice idle too.
This was with my actual old Kooks 1 7/8" headers which did not have the merge collector, not a Dyno header. When I finally get it on a chassis dyno, it now has 2" Kooks headers with a 3 1/2" Merge collector, hoping to see a modest gain from them. 10-15 would be nice.
Anyway for comparison. I would have thought the LS7 port would have had more on the top end and the Cathedral ports with more low end torque, which it does in this case.
I think Tony M made around 735 with his 454, all the people saying these should make 800 on pump gas, I do not think it is as easy as that. It has been done, but is not common by any means.
I think the OP has a nice motor there, has nice idle too.
01-05-2013, 11:36 PM
#35
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01-06-2013, 01:54 AM
#36
Or even the Holley cast high rise EFI intake.
BTW....we like MY C5's!
Ron
01-06-2013, 06:53 AM
#37
I flowbenched it and it only flowed 283 cfm. I think the bench it was on was a little stingy, but it was still surprising how a 55mm runner flowed so little.
I had a fair bit of work done to it and we gained over 40cfm, which did help.
I redesigned and had a set of new throttle shafts made which gained 12 cfm alone. Porting gained the rest.
That is a different story though.
The throttle response is really good though.
Last edited by RAMPANT; 01-06-2013 at 09:21 PM.
01-08-2013, 08:29 PM
#39
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Chad has tested many LS engine carb setups and directly compared to EFI FAST inlet and gets at least 50hp more on the same engine.
03-02-2013, 08:52 PM
#40
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3" exhaust install. 
Vacuum Tank for the Silent Choice Exhaust Note (Police and Neighbor Friendly)
Last edited by TheCapo; 03-03-2013 at 08:55 AM.