I posted a thread a while back asking about the part # I need for my camaro with a 350 and I was told I need a 502-6 well the guy I am buying it from said that its a #80405 I figure thats not the actual part# because he doesnt know much about it so I was wondering if anyone knows what unit this is?Also I have hears about people haveing problems wiring the injectors up ,I was wondering if anyone could help explain that to me also . Thanks guys I appreciate it.

 

I asked the same question of the Holley tech staff. Here is their response:

"The 80405 is a 502-6 throttle body for a 87-89 chevy 350 truck. The 80374 is a 670 replacement throttle body for our projection application. Thanks Jessie"

Best-
S-D

 

Alright thats what I need , I appreciate it man , Now I am going to buy it all I need to know is the Question about the wiring . Could I just plug My harness into there injectors?

 

I believe that the TPS connector is different. You may want to do a search to verify that.
I can tell you that the TPS on my 87 TBI pickup truck is different than the TPS sensor connector for my 1991 Camaro TBI.
S-D

 

what sized engines?

 

If the GM connector matches the Holley injectors I dont see why not. The Holley TPS may need a holley TPS pigtail or another that mates.

 

I'm looking at throttle body spacers for my LO3 TBI for my '89 IROC Camaro. If I look under the camaro parts list in any parts store or online, the only thing that comes up is the TPI spacers, but if I look under a 1989 Chevy 305 5.0L then I could get a spacer. Is the throttle body on the truck the same as the throttle body on my camaro? If so then I could use the throttle body spacer, right?

Thanks,
- Justin

 

they both are the same.. I have a TBI spacer that is from Trans Dept. You can google them and find out more..

 

One more question, obviously I would need to change the intake to compensate for the increased flow, but would a 454 TBI work, as far as sensor hook-up, and fitment to my 305 motor?

 

I hate to rain on your parade but why are you considering a 7.4L TBI unit? Unless you have mods that require an increase in flow(25% + or -)? Regardless 7.4L TBI will require significant ECM tuning. I thought the TB itself is same size for 305/350. They do vary in inj size. Stock TB is adequate for stock or mild mods.

 

Squeeze the most out of your stock TBI unit. Almost done with mine.
Took off the Raised ridges, bowled the edges, and grind'd the throttle shafts so far.


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