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Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

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Old 07-17-2010, 05:58 AM   #1
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Default 305 tpi engine

i am going to be getting a 91 formula with a 305 tpi engine and i was wondering if the engine or is worth keeping? would i be able to get any serious hp and torque out of it ..the car has vortech heads and a zz4 cam already so are the 305 tpi engine capable of good hp and torque 300-400?? if so what mods would be required
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Old 07-17-2010, 04:01 PM   #2
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Not really. the engine is good for what it was made for.. But not for all out performance. Especially not the tpi system since it loose breath at 4500rpm approx.

I have a 305 with headers, true duals, performer intake, Hei dialed in perfectly and a nice quadrajet. People are surprised of tis performance, but it will never become a good street racing engine cost wise to a 350/383
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Old 07-17-2010, 06:42 PM   #3
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turbocharger or step up to 350 based engine.
i would just go turbo lsx, plenty tq there
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Old 07-18-2010, 07:29 AM   #4
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Swap over everything to a 350 and you will have a 12 sec car. I have seen a zz4 crate motor run 12's in an f-body. With the zz4 crate having alum. l98 heads and you have the vortecs, the vortecs might edge out the l98 heads with it having a little bit bigger intake runner and better port design.

The 305 can be made to run well into the 13's on motor maybe a high 12 if done correctly but its a waste of time in my opinion. Me and my buddies had a 305 tpi car running 12.1 to 12.2 in the quarter on a 150 shot back in the day which was quick back then. Man, we took some money from people with that car!
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Old 07-18-2010, 08:39 AM   #5
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300HP is doable with a 305 TPI. Is your motor from a 5 speed or automatic? Autos had the peanut cam which is from a TBI car which is terrible....
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Old 07-18-2010, 09:15 AM   #6
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300HP is doable with a 305 TPI. Is your motor from a 5 speed or automatic? Autos had the peanut cam which is from a TBI car which is terrible....
The peanut cam was in the 86 and 87 cars not the 91 and also he said there is a zz4 cam in it which is wayyyyy better than any TPI cam
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Old 07-21-2010, 05:14 AM   #7
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The LB9 can be a fun little motor. I've got one in my 85 T/A, and with what little work I have in it, it'll hang with most Mustangs around here, at a stop light style race, and knock down 28 mpg on the highway, if I let it. It won't ever be a real power house though, as it's just not economical, that's why my plans for it are a 6.0 swap.
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Old 07-25-2010, 09:45 PM   #8
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i really want to swap in a 6.0 as well but i am going to keep a tpi engine in it because i have an old friend that swears his car is the fastest tpi around and that my ls1 could only beat him by 1 car and a half and ive rapped him many times lol so i want to shut him up with the same engine ..he has a full bolt on l98 engine with heads and cam
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Old 07-25-2010, 10:10 PM   #9
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Watch out! make sure he's not playing with you. My cousin's l98 z28 runs 11.60 with heads and cam and intake.
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Old 07-26-2010, 02:22 AM   #10
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lol no he is not his car is weak and so is he as a driver on full slicks he barley broke a 13.69
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Old 07-27-2010, 05:38 PM   #11
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lol no he is not his car is weak and so is he as a driver on full slicks he barley broke a 13.69
dam. i would not be proud of that. especially on slicks
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Old 07-28-2010, 01:45 PM   #12
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off topic, sorry

Anyone know what cam is in my 87 elky?

Its very fuel efficient, but the cam feels very dull!
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Old 07-28-2010, 03:09 PM   #13
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Original motor? 305? 350?
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Old 07-28-2010, 03:49 PM   #14
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original 305.. It's an lg4 engine.. I have a performer plus cam laying around i could swap in it if it wouldnt hurt the fuel consumption but if they're basically the same cam it wouldnt be worth the effort. I will change the valve seals though.. They're leaking which is a common fault on these 305 engines
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Old 07-28-2010, 06:29 PM   #15
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Quote:
Originally Posted by Najania View Post
original 305.. It's an lg4 engine.. I have a performer plus cam laying around i could swap in it if it wouldnt hurt the fuel consumption but if they're basically the same cam it wouldnt be worth the effort. I will change the valve seals though.. They're leaking which is a common fault on these 305 engines
That wouldn't even be worth the time to change it.
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Old 07-28-2010, 06:29 PM
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