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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 06-04-2011, 03:00 PM   #1
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Location: Texas City, Texas Area
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Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
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1.6 Roller Rocker ????

Who, or how many out there are running 1.6 roller rockers on their TBI 305, with NO HEAD MODIFICATIONS??? Has anyone had pushrod clearance issues??? Thanks for any replies to this....Tom
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89 RS 305 TBI with every bolt on known to man.Lots of Suspension work...Canyon Carver, handles like a race car.....

92 Z28 350 TPI lots of goodies on it, but lots to go...Mustang Killer.........
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Old 06-05-2011, 04:02 PM   #2
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Re: 1.6 Roller Rocker ????

Self-aligning rocker arms???
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Old 06-07-2011, 11:27 AM   #3
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Car: 89 Chevrolet Camaro RS
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Re: 1.6 Roller Rocker ????

my buddy ran some 1.6 on his 305 tpi with 416 heads but with a stock camshaft. with no problems. but that head design is different then the centerbolts.
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4bbl TBI run by EBL with full roller setup coming 2014.
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Old 06-07-2011, 06:59 PM   #4
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Re: 1.6 Roller Rocker ????

Dude, where you at?
Haven't seen you at the gas shop since it re-opened. PM me...

Most of the aftermarket 1.6 rollers are to wide for the stock center-bolt
head-covers -- the oil breather won't fit in between them.
I wound up going with some Crane's that are specifically for these GM heads.
And they were, as you might guess, price-ier than e-bay bargains.
Also the push-rod length is a bit different (shorter if I recall) to keep the
roller properly centered over the valve. Off-center will cause excessive
side-wear on the valve guides. At least thats the theory.

I'm pretty close to getting mine running -- when I get back in town soon.

kk
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Old 06-07-2011, 09:08 PM   #5
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Re: 1.6 Roller Rocker ????

i will be using comp cams 12-364-4 cam with 1.6 self aligning magnum roller rockers and magnum lifters and push rods. there will be clearance issues so i will need to machine the heads. if your using the stock cam then u should be fine if not you may need to mod your heads.
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Old 06-07-2011, 09:38 PM   #6
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Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
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Re: 1.6 Roller Rocker ????

Quote:
Originally Posted by Schurkey View Post
Self-aligning rocker arms???

Yes mine are self aligning....
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Old 06-07-2011, 09:41 PM   #7
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Join Date: Dec 2005
Location: Texas City, Texas Area
Posts: 1,232
Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
Transmission: 700R4 Both Cars
Axle/Gears: 3.23 Posi.. 4 wheel disc both cars

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Re: 1.6 Roller Rocker ????

Quote:
Originally Posted by l_dis_travlr View Post
Dude, where you at?
Haven't seen you at the gas shop since it re-opened. PM me...

Most of the aftermarket 1.6 rollers are to wide for the stock center-bolt
head-covers -- the oil breather won't fit in between them.
I wound up going with some Crane's that are specifically for these GM heads.
And they were, as you might guess, price-ier than e-bay bargains.
Also the push-rod length is a bit different (shorter if I recall) to keep the
roller properly centered over the valve. Off-center will cause excessive
side-wear on the valve guides. At least thats the theory.

I'm pretty close to getting mine running -- when I get back in town soon.

kk

Have Comps version, the clearance problem is in the hole in the head where the push rod goes thru...Am at a different Gas Shop, same Company..Hurricane Ike took my job out at the old place...
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Old 06-07-2011, 09:41 PM
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