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#1
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Modified stock intake
So I took a shot of modifying my stock iron intake. Tried to copy Cliffs intake pics. Traced out what I wanted and the took a Sawzall to the big pieces. Then took a electric die grinder and blended in the rest. Right side was easy but the left was much thicker and took some time. Using the same 1/2" spacer which has a notch already so I didn't remove any metal from the center divider. Just opened it from a 4 hole spacer to matching the intake.If it doesn't gain any HP at least its lighter now. Lol
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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' |
#2
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Looks real good. Hmmm, i could use that Spacer.
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#3
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Looks good. That's pretty much how I've done them with the notch in a short spacer etc...
With one small exception. I kept the front bores a little smaller to closely match the throttle bores of the Q-jet as per how Jim Hand did it. I think the theory was a little more velocity and better throttle response, but I haven't noticed much difference either way. |
#4
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Quote:
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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' |
#5
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Quote:
Not that it's a big deal. I've done them the way you have it too and don't notice any difference, it'll run perfectly fine like that. |
#6
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What gasket are u using between this spacer and the carb
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#7
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I use a thicker one between carb and spacer...like a 1/8th" or so. Then a thinner one between spacer and intake. I cut both of those to the shape of the spacer.
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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' |
#8
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I need to go look and see what I have
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1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's |
#9
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Both gaskets started life as 4 holers, Used scissors and utility knife to make them look like thee intake opening.
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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' |
#10
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Got your email Scott, I'll send you some pics tonight as soon as I figure out this computer.
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#11
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Here's how I did mine. Looks like I should have spent more time in the plenum radiusing the corners.
The outside of it resembles a RA/HO at first glance. Sure is a lot lighter and runs cooler. |
The Following 2 Users Say Thank You to Slick For This Useful Post: | ||
#12
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Dang, i have pent-up Cast Iron Intake performance anxieties. My 4234 which matches my R 96 A heads is Stock, and needs the Mahoney treatment. I am willing to settle for the above.
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12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
#13
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Looking at post 11. I wonder about leaving the top of the secondary, front to rear divider intact, and grinding a opening below it to connect the sides. Wondering if leaving some of that top F-R divider in place and contouring it for port velocity............have not seen one like that.....I have seen all of Jim Hands doings, for intake plenum mods...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
The Following User Says Thank You to 77 TRASHCAN For This Useful Post: | ||
#14
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Quote:
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#15
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Mine ended up like this when I was putzing around with intakes…..note the 1” spacer
It couldn’t match the RPM on my combos…..had fun carving it up though!
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
#16
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Here's an SD Perf CNC modified intake to compare to.
Dennis |
The Following User Says Thank You to SD455DJ For This Useful Post: | ||
#17
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That's the one I was trying to copy. I did find online a pic of the jim hand modification that formula Jones was talking about. Only way to get that shape now would be to get another spacer and shape it to that which now would only be making a 1/2 " ledge.
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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' |
#18
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The SD intake is a copy of Cliff's iron intake. Cliff had posted several times, pictures of his original modified intake.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#19
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So I'll throw this out -the factory must have had a reason for 4 holes especially going all the way down the deep plenum-and Chevy had several 3 hole factory intakes. Why?
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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 |
#20
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I sent pictures to Scott how I've done a few of them, which is the old Jim Hand way. I've also done them like the Cliff Ruggle way which Dave as SD has copied for Cliff.
I think what has happened over the years is the Jim Hand way morphed into the Cliff Ruggle way and now the Cliff version is the widely accepted (more recent) way of doing it. Either one works about identical from what I've been able to tell from my own personal use. |
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