350 crossfire injection motor build
#51
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Car: '92 Corvette, '89 1/2-a-'Vette
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Re: 350 crossfire injection motor build
Yes. The Vortec heads are wonderful.
This thread is about crossfire intake manifolds and the engines they attach to, and you're unlikely to get a crossfire manifold to bolt to OEM Vortec heads, or cover the extra-tall Vortec ports.
Sure, you can weld and kludge the manifold and the heads to make it all fit...but most folks wouldn't.
This thread is about crossfire intake manifolds and the engines they attach to, and you're unlikely to get a crossfire manifold to bolt to OEM Vortec heads, or cover the extra-tall Vortec ports.
Sure, you can weld and kludge the manifold and the heads to make it all fit...but most folks wouldn't.
.
Last edited by Tom 400 CFI; 09-12-2022 at 09:21 AM.
#52
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 350 crossfire injection motor build
Thats what die grinders are for. Porting the base makes a HUGE difference on both 305 and 350 cars. My current LU5 (305) T5 T/A is running 14.30s with a ported base, stock cam, stock 416 heads, 3.73s, shortys and 3” exhaust. I average 18mpg city and 25mpg highway with an 8746 ECM. Daily driver, and reliable as can be.
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dmccain (09-12-2022)
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Car: 89 Firebird
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Re: 350 crossfire injection motor build
I put a mild cam, edelbrock intake, 650 Holley and headers on an LG4 Formula back in HS and only mustered a 14.8 My 91 Z28 LB9 ran a tick better bone stock 14.76
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Car: '92 Corvette, '89 1/2-a-'Vette
Engine: LT1, L98
Transmission: ZF6, ZF6
Axle/Gears: 3.45, 3.31
Re: 350 crossfire injection motor build
I did a cam ONLY, 160 stat, timing, no fan and no mufflers in my LG4 and went 15.3@85. That cam chopped almost a second off the car's time (16.2 before the cam)....but I'm sure the stock exhaust manifolds and Y were killing the thing! But if I saw you go 14.8's in an LG4 auto, back in the day? I'd be pretty impressed.
The cool thing about the CFI car is that it was do about that (14.8ish) with just the headers, timing and fuel pressure.
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Re: 350 crossfire injection motor build
and IMO, all the work, effort and $$$ it takes to get these cars to produce 300+ HP is just not worth the effort and $$$, I'm fine with a stock 230 HP car
and just cruising around the local auto shows and car cruise nights - if I want to street race, I can go out and pick up a newer
500+ HP (and much more) car to play with and build upon that.....but I appreciate the work, time, effort and $$$ that guys here put into getting 3rd gens to produce over 300+ HP
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Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: 350 crossfire injection motor build
Back in the day when these cars were new I was into the performance and building up a stock motor with bolt-ons, etc, these days 300 HP is nothing
and IMO, all the work, effort and $$$ it takes to get these cars to produce 300+ HP is just not worth the effort and $$$, I'm fine with a stock 230 HP car
and just cruising around the local auto shows and car cruise nights - if I want to street race, I can go out and pick up a newer
500+ HP (and much more) car to play with and build upon that.....but I appreciate the work, time, effort and $$$ that guys here put into getting 3rd gens to produce over 300+ HP
and IMO, all the work, effort and $$$ it takes to get these cars to produce 300+ HP is just not worth the effort and $$$, I'm fine with a stock 230 HP car
and just cruising around the local auto shows and car cruise nights - if I want to street race, I can go out and pick up a newer
500+ HP (and much more) car to play with and build upon that.....but I appreciate the work, time, effort and $$$ that guys here put into getting 3rd gens to produce over 300+ HP
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BizJetTech (09-12-2022)
#58
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Re: 350 crossfire injection motor build
Back in the day when these cars were new I was into the performance and building up a stock motor with bolt-ons, etc, these days 300 HP is nothing
and IMO, all the work, effort and $$$ it takes to get these cars to produce 300+ HP is just not worth the effort and $$$, I'm fine with a stock 230 HP car
and just cruising around the local auto shows and car cruise nights - if I want to street race, I can go out and pick up a newer
500+ HP (and much more) car to play with and build upon that.....but I appreciate the work, time, effort and $$$ that guys here put into getting 3rd gens to produce over 300+ HP
and IMO, all the work, effort and $$$ it takes to get these cars to produce 300+ HP is just not worth the effort and $$$, I'm fine with a stock 230 HP car
and just cruising around the local auto shows and car cruise nights - if I want to street race, I can go out and pick up a newer
500+ HP (and much more) car to play with and build upon that.....but I appreciate the work, time, effort and $$$ that guys here put into getting 3rd gens to produce over 300+ HP
I've been in some really fast cars. Then I've been in some really really fast cars. 2100lbs with me in it and 650 at the tire N/A.... Thats a hell of a car and way too much for me... and apparently anything else on the road too. Anything beyond 400 at the tire is beyond what the average person could handle comfortably anyway. Well without traction control and all the other nannies that go with it.
It's pretty cool to be growing up in a time where you can walk into a showroom and buy a 600+ hp vehicle and still be able to drive it all year without fear of dying. It rains and I have to park the vette because those Sport comp 2s just don't do well no matter how easy I touch the throttle lol. That's like 80% of the fun though, knowing the only thing keeping me alive is my control of my right foot.
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NoEmissions84TA (09-12-2022)
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Car: 1988 Trans Am
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Re: 350 crossfire injection motor build
None that I know of, or trust not to go all "photobucket" on my later. When ownership at the bucket when crazy, holding images captive for insane new membership fees, I switched to Flickr. Costs me a few bucks a year, but is very stable, and I have unlimited space.
Have you tried this thread here?
https://www.thirdgen.org/forums/diy-...uning-ebl.html
Have you tried this thread here?
https://www.thirdgen.org/forums/diy-...uning-ebl.html
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
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Re: 350 crossfire injection motor build
Last edited by Fast355; 09-30-2022 at 11:18 AM.
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: 350 crossfire injection motor build
Here is a generic description for your camshaft: (from Elgin) Look at E-903-P
Range C (Hydraulic: 210° - 225° Effective Duration)
(Mechanical: 220° - 235° Effective Duration)
Fair idle quality with lope. Good mid-range torque and response in 2400 - 3200 RPM range. Operating power
range 2000 - 4800 RPM. Good fuel economy cam with correct equipment. Good choice for light towing.
Compression 10.3 to 1 or less. Will work with stock or slightly modified engine, stock automatic or manual
transmission. Recommended spring pressure 110 lbs. for valve on seat; 280 lbs. for valve open. Axle ratio
3.70 to 1 or higher is best. Recommended for mild bracket racing.
Range C (Hydraulic: 210° - 225° Effective Duration)
(Mechanical: 220° - 235° Effective Duration)
Fair idle quality with lope. Good mid-range torque and response in 2400 - 3200 RPM range. Operating power
range 2000 - 4800 RPM. Good fuel economy cam with correct equipment. Good choice for light towing.
Compression 10.3 to 1 or less. Will work with stock or slightly modified engine, stock automatic or manual
transmission. Recommended spring pressure 110 lbs. for valve on seat; 280 lbs. for valve open. Axle ratio
3.70 to 1 or higher is best. Recommended for mild bracket racing.
#70
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#72
Junior Member
Re: 350 crossfire injection motor build
A couple of notes:
- Base timing is 12 degrees
- idle speed is 850 park/800 in gear warm
- total timing is 28 degrees
- Vacuum reference FPR set to 22 psi
- Closed loop enabled
- Lean cruise enabled
#74
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