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#21
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On the GTO, the 3" splitters don't look right to me, so I will do 2.5 tailpipes and tips. Same with the 71 T/A, the hockey stick 3" tips just don't look right. Also, it has a 9", and the larger axle tubes make it near impossible to run 3" tailpipes. It's a 463 stroker, 315cfm heads, so think it will be much less of a restriction. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#22
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Dave Bisschop's custom 'Road Paver' uses Comp High Lift Magnum lobes.
Lobes 3115 and 3116 and typically ordered with a "B" lobe suffix code. Used with a Pontiac cam journal size the rated duration is 306/314 Duration at .050" is 246/252 Duration at .200" is 164/169 Lobe lift is .4000" on both lobes. It is ground with both a 112 and a 114 lobe separation with typically 4 degrees advance. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#23
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Something a bit bigger than the Dave Bisschop Road Paver.....
He has done a 535 using Edelbrock 345cfm heads at 10.75:1 compression and a hydraulic roller cam in the 250's / 260's with a 114 lobe separation and lift in the upper .600s. With a highly modified Victor intake, both runner and plenium work, 1-inch HVH Super Sucker and a 1050 Pro Systems Dominator it made 718 hp at 6100 rpm and 663 ft.lbs. at 4900 rpm. With a 4150 Victor intake and a modified HP950 it made 694 hp at 6200 rpm and 660 ft.lbs. at 4900 rpm. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#24
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It made those numbers with a Victor intake and 2 inch super sucker with a 4150 950 HP on top. Oddly dynod with a dominator and it only made 6 more HP but the average torque dropped over the small carb so it was decided to keep the 4150 on it for more air cleaner choices. It was also dynod with the 2" chassis headers he runs on the car and bischoff had a short 3" exhaust setup attached to it. Typically dyno operators run a dyno header on there similar to sprint car headers which will inflate the numbers a bit more Last edited by Formulajones; 03-21-2024 at 11:11 AM. |
#25
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I ran Doug's 1-7/8" primary headers, 3-1/2" to the x-crossover, and 3" for the remainder including full tails. I had 2 different induction systems dynoed for it....a Q-jet/ported HO and a Holley 950/1000/TorkerII setup. The Q-jet/HO combo made 605 peak HP...and the torque peak wasn't much different from the 667, but can't remember the exact number. I was going to try a Northwind which was new at the time, but life happened and never got to it. Another thing worth mentioning was that I added a vacuum pump due to the long stroke, which solved my "oil out the dipstick under hard acceleration" issue. Never took it to the dragstrip, but ran it with a vericom on a county road one cool fall day. It showed a 10.90et at 124MPH with me and a friend in it at the time. The thing was a barge at 4080lbs...
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#26
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24hp is a good jump, but there too, would have expected more. Maybe both showed more average HP? .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#27
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That's what I was thinking, 4.75 stroke. What was the lead time on that crank? .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#28
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I think your intake(s) may be holding that combo back some. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#29
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I'm running a Tomahawk baffled valley pan with an OE type PCV, plumbed into the base of the carb pad on the Victor, and I see at most a slight 'misting' of oil at most.
You sure your dipstick isn't just rattling out? Did you see evidence of oil in the intake before the vacuum pump? .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#30
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No argument there. Undoubtedly left some on the table....but I was already paving roads two stripes at a time, and a more appropriate intake was not going to improve paving efficiency....so....
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#31
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#32
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#33
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It's a big reason I scrapped the stroker build I was doing and just bought a blueprint 598. They were in stock, dynod and ready to ship. Last edited by Formulajones; 03-21-2024 at 02:24 PM. |
#34
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Ah so we aren't the only one that experienced that. I thought for sure the dominator would shine on a 571 and it was Tony's go to dyno carb that he's tuned and tweaked for years on many combos but it just didn't impress on Dad's engine for what ever reason. In fact Tony was shocked at how well the little 950 HP ran on it. I think that carb actually only flowed around 830 cfm on the bench.
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#35
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I still have the Dominator and have had Jeff(Shaker 455) tweak it back to a 2 circuit so it may go back on at some time on a dedicated 4500 manifold. Probably not until we start seeing better 60 fts anyway.
We also tried a removable sleeve Demon 4150 with the largest sleeves so more than the 850 size-not much there either. All of those were on a Victor 4150 manifold. Cam Comp .406 High torq lobes on a 112 LS 108 IC. 1.65 Crower Ss shaft system
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#36
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Here in this example only about 15 HP difference between a 4150 carb and a 1050 Dominator carb....
I have a old Brad Urban model 4779 Holley 750 Double Pumper carburetor . It has his Stage 3 modification and without the use of a 850 Base Plate he rated it at 926cfm. It has the choke tower removed. On my previous 4.125 stroke 450 CID combo with a 4150 Victor intake that carburetor and a 1/2-inch open spacer supported 684.1 hp at 7000 rpm. On the same engine with a 1050 Victor intake and a 8896HP Dominator carburetor and 1" cloverleaf spacer it made 699.9 hp at 6900 rpm. Both intakes were properly port matched to the cylinder heads, and both with some minor runner blending and plenum clean up. .
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#37
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BBCs have giant heads, Our best is not even middle of the road with them. You can make just about any HP you want with one AND cheaper.
BUT !!!! they are not cool and never will be. I would rather fight with a Pontiac and one hand tied behind my back than run one. |
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#38
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That's why they are still hugely popular in a wide range of motorsports and probably always will be. Aftermarket support is huge and big hp is just bolt on parts away and relatively inexpensive compared to some brands. Then of course there is the ability to accept large cranks in stock blocks as well as make really stupid power without the need for an aftermarket piece.
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#39
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#40
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Wow, that's impressive! I've only tried off the shelf bent tailpipes, and the 'loop' is too close together. I actually even tried denting the loop too, no-go.
.
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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