Need help! Vortec TPI with L31 heads

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Feb 20, 2004 | 05:41 PM

My85TA

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Joined: Oct 2001

Posts: 16

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From: Ponca City, OK

Need help! Vortec TPI with L31 heads

I'm trying to put together an engine for my 85 TA. It now has a 305 TPI. I am wanting to order a shortblock with the L31 vortec heads and putting a Comp 260AH-12 cam in.

Will the upper part of my TPI from the 305 work.

What size of injectors will I need to get, considering I would like to later add a 100-150 shot of NOS?

Also what is a good ignition to go with?

Feb 20, 2004 | 07:30 PM

Shaun 90 Iroc

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Joined: Oct 2001

Posts: 134

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From: Broken Arrow, OK (Tulsa)

Car: 1990 Iroc-Z

Engine: 350 L31 Vortec

Transmission: 700R4

you would need a TPI vortec baseplate ($400) to use vortec heads and TPI. 24 lb injectors..

Feb 20, 2004 | 10:13 PM

jmd

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Joined: Jul 2000

Posts: 6,519

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From: Aridzona

Car: `86 SS / `87 SS

Engine: L69 w/ TPI on top / 305 4bbl

Transmission: `95 T56 \ `88 200-4R

Re: Need help! Vortec TPI with L31 heads

Quote:

Originally posted by My85TA
I'm trying to put together an engine for my 85 TA. It now has a 305 TPI. I am wanting to order a shortblock with the L31 vortec heads and putting a Comp 260AH-12 cam in.

Will the upper part of my TPI from the 305 work.

What size of injectors will I need to get, considering I would like to later add a 100-150 shot of NOS?

Also what is a good ignition to go with?

Yes the upper part works but it's still a long runner intake which will focus power in the lower rpm range, so you might look into the RamJet intake instead.

24lb injectors would be cool. If you do your own proms a lot of sizes would work properly.

Stock ignition is good. Just make sure cap rotor, coil and module are up to snuff.