TBI distributor 454/7.4L

[Sgt Gus]

Ugh,
My 454, TBI distributor is a .427 shaft, I need a .491 or .500 to order a distributor melonized gear for comp hydraulic roller(11-412-8). They don't make one for the .427
Replace the distributor and coil?
I am having a hard time finding one.
Recommendations pretty please
#gmbellew #catbox

 

[Ricko1966]

Ugh,
My 454, TBI distributor is a .427 shaft, I need a .491 or .500 to order a distributor melonized gear for comp hydraulic roller(11-412-8). They don't make one for the .427

Replace the distributor and coil?
I am having a hard time finding one.

Recommendations pretty please

I'd make a bushing,either make the OD .0005 to big or the ID .0005 to small,use heat and a freezer to put the 2 together. Meaning if the ID is too small heat the bushing freeze the distributor put the 2 together,when the temps equalize it will be 1 piece. Come to think of it I'd make the OD of the bushing,ID of the gear my interference,you can get more expansion on the larger diameter. So it would be heat the distributor gear freeze the bushing.

 

[bucket]

Ugh,
My 454, TBI distributor is a .427 shaft, I need a .491 or .500 to order a distributor melonized gear for comp hydraulic roller(11-412-8). They don't make one for the .427

Replace the distributor and coil?
I am having a hard time finding one.

Recommendations pretty please

Are you positive you need a melonozed gear? A lot of Comp's BB hydraulic roller cams don't require one.

Besides that, MSD offers a fancy drop-in distributor. The big block uses the same distributor as a small block too, unless you have a tall deck block.

 

[Sgt Gus]

Are you positive you need a melonozed gear? A lot of Comp's BB hydraulic roller cams don't require one.

Besides that, MSD offers a fancy drop-in distributor. The big block uses the same distributor as a small block too, unless you have a tall deck block.

I am rereading, machinist thought so.
I may call comp tomorrow.

 

[Sgt Gus]

So, yes comp says their special gear is required or a melonized one per engine shop.
Easiest to replace distributor for tbi...?

 

[gmbellew]

I see COMP makes some melonized gears that are available on summit? https://www.summitracing.com/parts/...ZzaK2-QlTePqA259EahH0KhoC1rkQAvD_BwE#overview

 

[Bextreme04]

So, yes comp says their special gear is required or a melonized one per engine shop.
Easiest to replace distributor for tbi...?

Factory 97-up 7.4L distributor gear is the answer here. I put one on my 97 K2500 454 when I rebuilt everything. It's a factory AC Delco part. GM PN 10457708

Its a melonized gear for the factory billet hydraulic roller cams.

 

[Sgt Gus]

Factory 97-up 7.4L distributor gear is the answer here. I put one on my 97 K2500 454 when I rebuilt everything. It's a factory AC Delco part. GM PN 10457708

Its a melonized gear for the factory billet hydraulic roller cams.

What diameter will it fit? Mine is .427, and most are .491 or .500

 

[Sgt Gus]

I see COMP makes some melonized gears that are available on summit? https://www.summitracing.com/parts/...ZzaK2-QlTePqA259EahH0KhoC1rkQAvD_BwE#overview

Yes, my distributor diameter is .427, that is .491, so may need new distributor.
Gonna lookup part below.

 

[Bextreme04]

What diameter will it fit? Mine is .427, and most are .491 or .500

All TBI and Vortec distributors in the GMT-400's are .427". That gear PN i gave you is for a stock .427 shaft Vortec distributor. Here's a long thread on the GMT-400 forum talking about almost an identical situation to what you are going through.
https://www.gmt400.com/threads/all-replacement-vortec-distributers-have-427-shafts.64438/

 

[Sgt Gus]

All TBI and Vortec distributors in the GMT-400's are .427". That gear PN i gave you is for a stock .427 shaft Vortec distributor. Here's a long thread on the GMT-400 forum talking about almost an identical situation to what you are going through.
https://www.gmt400.com/threads/all-replacement-vortec-distributers-have-427-shafts.64438/

Ok, thankyou! Searching for gear.