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8.15. GM Spec Engine Option?


y5e06

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I was reading the rules for CMC and read 8.15.

The way it is written it sounds as if you can add any of the four components and not are not required to add all four together as a package.

i.e. can the Performer Cam #2102 be added to a 305 TPI car?

Thanks.

 

 

 

8.15. GM Spec Engine Option

The following unmodified aftermarket components only may be installed on an OEM stock unmodified GM/Chevrolet 5.0 liter (305ci) V8 long block:

 

1) Holley carburetor 600cfm-4bbl #4776

2) Edelbrock Performer intake manifold #2101 or #2104

3) Edelbrock Performer Cam kit #2102

4) GM OEM H.E.I. distributor (non-computer controlled)

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Correct,you can do all four to be CMC legal, but if you choose to use other than those 4 components then you will be non legal,so really that is your only choice if you are going non TPI.

Also the cam can't be added to a TPI,and if you did try to put that cam in a tpi,the car would not run.

Thanks,

Tony

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Tony, any word on whether the cam would work on a Throttle Body-I ask as the boy has a sparkling rebuilt 305 on the engine stand for his '90 and it has the summit version of that cam in it.

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Morgan

 

The thing is, you can only add those specific components to a LONG block. If you choose to not add ALL of those components...its probably not going to run too well

 

By definition a long block doesn't include the TPI, so to answer your question directly, no. Either stock TPI, or spec components.

 

Kevin

I dont see why you couldnt do that for a street car. The TPI should have more than adequate fuel delivery capacity for the Hp your engine combo will generate. Since you're not readily able to play with the mix, you may have to use an adjustable fuel pressure regulator. The computer will try to do what it needs to, but it may not have enough dwell adjustment range. If you bump fuel pressure, you bump fuel flow rate at the same dwell. It should work, try it...but make sure it doesnt run lean at the top!

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  • 2 weeks later...

Is there any plans to allow a carb setup on the 4th Gen cars? It would probably not have as good of a powerband, but it would be so much simpler to troubleshoot and work on..

 

Im still fighting a high RPM miss on my 93.

 

David

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Sam Stowell has been running and testing with a carb 350 in his 95 Camaro and has had nothing but problems..guess what he is going back to a LT1 fuel injection set up,and I dont see carb set up for the 4th gen in the future of CMC at this point, it just makes no sense.

Tony

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David...the most common cause of high speed misses is a bad ground...we use -2 cable for grounds (two) and haven't had that problem in a decade...rp

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Thanks Richard... Maybe I wont have to replace the ICM to cure my problem

 

Wierd thing is a new coil seemed to make the miss about 50% better, and it seems to get worse with heat...

 

David

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so Tony... king of killer deals... Whats the least expensive way to make an opti work again. No way... aint gonna spend $450 on a new one

 

Ive read the Pep Boys sells a kit that includes the Cap and Rotor, and I have found some howto's on venting them like the later model units.

 

David

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Geez... I dropped buy Autozone yesterday and they quoted me $171 for just the cap and rotor!!! W-T-Fudge!

 

Thanks for the tips. I'll do more calling around.

 

David

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You had better plan on carrying a replacement opti with you if you are going to race a 4th gen LT1. I can't count the # of times racer buddies had to go chase new ones down during race weekends! The opti is definitely the achilles heel of the otherwise reliable 4th gen!

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I think you're right about the $171. Vented opti should be ~$130.

The '94 Caprices (like mine) have vented optis like the '95+ f-bodies & vettes, they came out with that design one year earlier than the sporty cars. I forgot about that.

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