I've heard the Swirl Port heads are ok to 5500 rpm but fall off the chart after that. I've gone as far as I can with a custom tune, exhaust, cold air intake, tranny mods, larger TBI and injectors, etc. But I'm still way to slow.
Jul 12, 2007 · Location: tucson, 97 4x4 3/4 ton, 383 170 e-tec heads, 4l80e, 14 bolt diff. coming soon 411 pcm and 4.88 gears Quote Post by 383 silverado » Thu Jul 12, 2007 8:41 pm

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11. CNC Ported Heads.These heads are fully CNC ported and have our priority racing valve job. In some cases, we may offer 2 different CNC ported versions such as our Stage 3 ported LA or magnum Edelbrock heads, and the BigMouth heads with pushrods moved over to widen the port at the pushrod restriction and increase the port volume.
305 or 350 CID #17059298, #17059283 4 Barrel Rochester (Electric Choke) 8 Cylinder 5.0, 5.7 or 7.4 Liter 305, 307, 350 or 454 CID 4Barrel Rochester (Remote Choke)

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However, the 305 Vortec combustion chamber is similar to the swirl port head, which is an improvement over earlier heads. This chamber design places the spark plug more towards the center of the chamber and slightly biased towards the exhaust valve, all of which are improvements over the old smog castings. The L30 heads use self-aligning rocker ...
Apr 25, 2016 · GM introduced its Vortec line of engines in the mid-1990s, in I4, I5, I6, V6 and three V8 configurations in various displacements from 2.2L (I4) all the way up to 8.1L (V8).

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I just looked, and my screw port heads are 187s with 1.84" intake valves. I don't know if GM moved the valve spacing around on later heads. Back in the college days, there was a guy with 2.02 heads on his 283. At the time I knew it wasn't supposed to work well, but it was a '57 Chevy and it sounded good. That was all that mattered at the time.

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Nov 03, 2011 · The heads that are currently on this motor are GM' swirl port head and while they make great torque and decent fuel economy they don't produce much hp. Stock for this truck is around 190 hp. By going to the L98's with the very mild RV cam I'm gonna run and the few mods to my fuel system it should be a gain of at least 60 hp to the wheels.
Jan 27, 2010 · The "B" heads are the ones with the Chevy style exhaust port, and as most of you know, it is a stock Cobra Jet style intake port. The valve sizes were 2.300" on the intake and 1.820" on the exhaust. All flow numbers are from our SuperFlow SFC 600 bench and are on a 4.625" bore and are @ 28" H2O.

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swirl in place (use the leg bit of a pair of old washed pantihose and cut it off just beneath the gusset to make yourself a swirl-stocking (swirl-kous); 16. cover the stocking with a scarf ('n doek) (as a good lower-middle-class coloured girl should); 17. after a few hours (about three) swirl your hair to the other side and wear the stocking ...
305ci. Originally out of a 1991 Chevy Caprice. I dont know the exact mileage but it was about 130k.Block 14093627 87-94, 305, 2 bolt main, roller or flat tappet cam, 1 piece rear seal.Cylinder Head 14102187 87-91, 305, Intake 1.84, Exhaust 1.6, 58cc, EFI Swirl Port.

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Assault Racing Products Small Block Chevy Aluminum Cylinder Heads . 205cc Intake Port, 64cc Chamber, 2.02/1.6 Valve, Angle Plug, .550 Lift Springs Works on 305, 327, 350 and 400 not drilled for steam holes (This is for a PAIR of cylinder heads) 3/8" Shouldered Screw In Studs and Guide Plates Included (Not Installed)
Feb 04, 2012 · Trick Flow port-matched the manifold to the 2.110 x 1.25-inch intake openings on the Super 23 Race CNC Cylinder Heads. After completing the intake swap, Trick Flow put the hammer down on the 388. The reward was even more power—565 horsepower at 6,800 rpm, a gain of over five percent with a simple induction change.

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Aug 14, 2020 · Similar 305 heads were available with even smaller chambers. GM's first attempt to induce "swirl" on production iron-head small-block Chevy was to block off half the intake valve-bowl approach ...
The Swirl Flap position is adjusted by an electrical or vacuum-actuated servo mechanism, controlled by the ECU. The bad bits: On almost every engine from every manufacturer, the Swirl Flaps are known to degrade and eventually disintegrate, ending up being sucked into the engine, most of the time with...

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Apr 03, 2007 · Can you change the heads off a 1992 305 chevy TBI engine(vortec heads) and put them on a 1985 350 chevy eng.?
I have a set of 5A heads on my 94 4x4 with TBI, 76 Olds 350 short block, 204/214 cam, Sanderson headers and junk dual exhaust. The 4L60E and 3.73 also help launch. I removed the air tubes from the head. It far out performs the original swirl port sbc 350 and equals or betters 4000 rpm and down the LS 5.3 from 2003-04 I have drove a lot.

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Hello This auction is for a new pair,(2) Pro header LS cylinder heads for LS3 LS6 LS7 L76 L72 L92 CHEVROLET ENGINES.Heads have huge rectangle 255cc intake runners and 64cc combustion chambers. These Heads are much better than stock GM heads, you will get easily 75-80hp gains or more!!
The 305 heads I scored were 92 camaro at N/C w/zero miles. Don't have the casting #'s in front of me, but they are called swirl port fuel injection heads. Spent a lot of time port matching and polishing and even drilled the perimeter walls to accept the old style valve covers (that was a mistake). used a .015 steel shm hd gasket to bump compression 1/2 point.
May 17, 2020 · The swirl port heads on the l03 engine were pretty lame, nothing like the tuned port injection or vortec 305s. The TBI was probably the most reliable other than having to do an intake manifold gasket once in its lifetime.
Nov 04, 2005 · The heads preceding these (yearwise) are called vortex by GM but what that really means is swirl inlet runner, or swirl port runner // swirl port heads, so they are effectively the same as the LO3 heads on a 305, or the LO5 heads on a 350. The term vortec comes from vortex which is a rotating fluid flow.
Heads are "308" swirl port heads from 1988-91, rebuilt with competition valve job and a slight mill to true up the surface. Camshaft is MP P4452759 .430"/.450" lift, 260/268 duration, 110 lsa, installed at 108 intake centerline.

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