new to tpi injector size?
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Joined: Feb 2010
Posts: 222
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From: liverpool ny
Car: 1990 firbird formula
Engine: 355ci
Transmission: t56 spec3+ cluch
Axle/Gears: 9 bolt disc brake 2.77
new to tpi injector size?
So I picked up a tpi intake for my 355 but am not sure what size injectors to use the engine has 10.3:1 compression promaxx 2121 heads and comp cam .503 intake and .510 exhaust any idea on what size to get
Thanks Jesse
Thanks Jesse
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: new to tpi injector size?
If those heads are the 225cc intake version I'm thinking that cam (looks like a Comp 503; 224/230 ) is a little on the small size to match and the TPI is going to restrict them even more
Given the < 5000 rpm TPI intake limitations ,I suspect you won't be needing anything larger than stock 22 lb injectors ; 24lb at most
Given the < 5000 rpm TPI intake limitations ,I suspect you won't be needing anything larger than stock 22 lb injectors ; 24lb at most
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Joined: May 2008
Posts: 286
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From: Cicero, IL.
Car: 1987 Pontiac Firebird Trans Am WS6
Engine: SBC 350
Transmission: T-56
Axle/Gears: 3.70:1 BW M78 9-Bolt Posi
Re: new to tpi injector size?
I'm in the same boat. I'm rebuilding a 355, but I've got a Comp 306 cam with 510/540 lift and 229/245 duration with a 112 LSA. I'm trying to figure out if the 22# injectors will be ok, or if I should go with the 24#? I plan on using a set of stock L98 heads that have been ported and polished, along with larger dual springs and 2.020/1.600 valves. Can anyone recommend an injector?
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