FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#61
|
||||
|
||||
That trade off sounds right.
You gave up some down low torque / bottom end snap that made the start of a burn out easy for more torque where the motor spends its most reving time in during a pass down the track. It’s aways the average numbers that mean more even in heads up racing!
__________________
I do stuff for reasons. |
#62
|
||||
|
||||
Quote:
Awesome feedback. You are exactly right. Testing this stuff with a stick, especially one that is limited in it's 1st gear multipication is where it will show itself and why I was hoping you would do this. An automatic with a decent converter simply drives right through it. Question, I assume the stock 1/8" gasket was the open style? Since the intake is open with a divider. Next time at the track with mine I'll try just a gasket, which will lower the carb a 1/2" and give me more room to raise the air cleaner lid with a slightly taller filter. As of right now in it's factory configuration the lid is only 1/4" above the carb air horn and that's not doing me any favors, and it's too close to the hood to do anything with it. |
#63
|
||||
|
||||
Hey gang, don’t forget that with a Q-jet since it has no lead in radius on the secondary side air horn like a Holley that the radius / lead in taper that the cleaner base plate forms is also very important!
Here is some guide lines that should give you thought as to what might be able to be done. These numbers are percentage of flow gain over just a straight edge of a lead in tube. Number 11 looks like it’s doable with body putty or clay epoxy mod’s to a air cleaner base.
__________________
I do stuff for reasons. |
#64
|
||||
|
||||
Quote:
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
#65
|
||||
|
||||
Quote:
If I remove the 1/2" wood spacer I'd likely replace it with one of the 1/4" thick open gaskets, not for the space, but to act more like an insulator. I'm always insulating the carb from heat with at least one of those gaskets, or a wood or phenolic spacer etc...and since I daily the car everywhere, I'm not looking to create heat soak drivability problems. What I'm thinking is that switch would give me more room to play with the air cleaner lid. Not an issue on your car but on my firebird with the stock RA setup it's tight to the hood, just the way it is, and I've never liked the fact that the lid is nearly right on top of the choke horn. Not a great idea but they didn't have much to work with. I may not find a darn thing with those small changes but I'm always willing to try stuff, it's part of the fun. Your feedback has me wondering if there is something there. |
#66
|
||||
|
||||
I was under the impression that the SD intake had runner work done as well, not just plenum?
|
#67
|
||||
|
||||
Quote:
And then I started playing with spacers My best run last night was almost the exact run in my sig. It seems the tallier I go the more it hurts low rpm trq
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' Last edited by scott70; 10-01-2022 at 03:46 PM. |
The Following User Says Thank You to scott70 For This Useful Post: | ||
#68
|
|||
|
|||
cast iron
top off the mod by removing the heat crossover.
pic of my cast iron manifold that I cut out the heat crossover. Last edited by JUDGE3; 12-20-2023 at 10:55 AM. |
#69
|
||||
|
||||
Quote:
Thanks |
#70
|
||||
|
||||
Quote:
Thanks.
__________________
"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
#71
|
|||
|
|||
Hurricane Intake Manifold ?
https://butlerperformance.com/i-2445...tegory:1234847 Same height as a factory intake. .
__________________
'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 |
#72
|
||||
|
||||
About 12 pounds removing both exhaust and coolant crossovers and substituting an aluminum coolant crossover.
Check out post #14 in this thread: https://forums.maxperformanceinc.com...d.php?t=772223
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#73
|
|||
|
|||
cast iron intake
Quote:
no need to fill the heat risers in the heads, I fabbed the block off plates to cover that. make em wider etc depending on the heads your using. I used aluminum for the block off plates. made mine but you used to be able to buy em. |
#74
|
||||
|
||||
Hmmmm....interesting. I had SD fill my cross overs in the heads.
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
#75
|
||||
|
||||
Guess Ill sell that 11/16" spacer I just bought...dont believe Ill ever use it.
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
#76
|
||||
|
||||
https://youtu.be/j1xRw6iOMQw
https://youtu.be/G28StWtjYpo Daytime is 1st run,,the dark one is the last run with no spacer. Hard to hear but you can hear it goes through 1st gear quicker with the no spacer.
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
#77
|
|||
|
|||
Quote:
if its the same intake, lots of other places sell it for a lot cheaper than butlers price. i have one of the polished versions ive been considering trying but doubt it will run any better than my SD ported HO intake. speedway & a few others have these for less than $200 shipped. https://www.ebay.com/itm/26411819528...Bk9SR7yo7-HzYA |
#78
|
|||
|
|||
Personally I cannot speak for the other companies' products that have been involved with the Tomahawk intake. I bought one of the first production units as Butler describes. I suspect there is little if any difference between them.
While the Tomahawk intake was in fact patterned from a HSD intake modified by Dave Bisschop the production Tomahawk 'as cast' needed quite a bit of work if using taller ports like I used on my Edelbrock heads. For sales reasons on the production Tomahawk they took the nice Dave Bisschop designed runners and contoured them down VERY small at the port openings so that they would fit the small sized factory D-port heads. The plenium needed some work as well. Related, my Dave Bisschop modified HSD intake was a piece of artwork and performed very well. On dyno testing with my old street 462 motor this modified HSD intake made 476.2 ft.lbs. torque at 3500 rpm. Peak torque was at 4600 rpm with 589.0 ft.lbs. torque. It made peak power at 5600 rpm with 589.4 horsepower. At the same time we tested a Victor intake and the Tomahawk made only 10.6 less horsepower at peak. And at peak torque rpm it made about 6 ft.lbs. less torque than the Victor. One could do the same thing with a Tomahawk intake. .
__________________
'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 |
The Following User Says Thank You to Steve C. For This Useful Post: | ||
#79
|
||||
|
||||
if its the same intake, lots of other places sell it for a lot cheaper than butlers price. i have one of the polished versions ive been considering trying but doubt it will run any better than my SD ported HO intake.
All depends on HP level. Steve's intake dynoed the same as my modified Torker II on my 525 on the dyno 570 hp based on mph 455. My previous 455 that ran the same an HO intake lost a lot when I swapped the same T2 on it! The T2 picked up a BUNCH. on a low 11 high 10 3800lb car.
__________________
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 Last edited by Skip Fix; 10-03-2022 at 01:37 PM. |
#80
|
||||
|
||||
I've dyno and drag strip tested the Tomohawk intake. It absolutely REQUIRES at least a 1" spacer to perform like it should. Both on the dyno and at the track it did not fair well without one.
Not sure why and never much cared to chase that deal around much because it's too tall in that configuration for many of the applications it would end up on. So if you have room for one plus a 1" spacer and don't have to use a drop-base air cleaner or move the air cleaner lid too close to the carburetor, it might be something to look at. Even with that said it wouldn't even be on my list for an engine making less than about 500hp.......FWIW.......
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
Reply |
Thread Tools | |
Display Modes | |
|
|