EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4 - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 19th, 18, 06:02 AM Thread Starter
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EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

Any wisdom on running newer EFI on a 355 LT1 with 253/259 @ .050" lift solid roller cams? I've had a Demon 750 on there and have the wideband & AFR pretty close to 14.5:1 in idle & cruise (lots of work with idle feed restrictors, idle air bleeds, high-speed air bleeds) and 12.5:1 in WOT (5.5 power valve with 78s up front, 88s rear), but am tempted by the new EFI offerings. Welcome any ideas, experiences & real-world wisdom. I've worked with MoTec, Hondata & AEM ECUs and have a deep history of tuning both EFI and carbs/distributors with weights/springs & old school stuff. Getting into my 50s, I'd like to find something with a little better atomization of fuel, mixture distribution consistency, ease of tuning.

'69 Z/28 - Dad's orig. owner, 44K mi., match #s DZ302 & M20 preserved in glass case. LT-1 w/ 210 AFRs, 0.640" lift 253/259 @ .050" Erson roller and Tremec TKO600 in car for more fun & 11.7s @ 121 MPH on drag radials & pump gas.
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post #2 of 6 (permalink) Old Nov 15th, 18, 08:36 PM
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Re: EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

just installed a pro flo 4 on my 383 stroker.
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post #3 of 6 (permalink) Old Nov 16th, 18, 07:07 AM
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Re: EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

Holley Dominator ECU, dual O2 sensors, Wilson 105MM LS style TB and Injector Dynamics ID2000 injectors on my car. Cam is 274/286 @ 0.050".

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'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #4 of 6 (permalink) Old Nov 16th, 18, 08:26 AM
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Re: EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

Quote:
Originally Posted by Steve69SS396 View Post
Holley Dominator ECU, dual O2 sensors, Wilson 105MM LS style TB and Injector Dynamics ID2000 injectors on my car. Cam is 274/286 @ 0.050".

https://youtu.be/xdfZDOpaFCc
What is the LSA 114° or 106° ? LSA has a huge effect on overlap which is the problem with a long duration cam and computer controlled EFI or manifold vacuum with a carb.

As far as that goes why have a long duration cam if you can not rev it to 7,800 RPM where I shifted my 582 big block with a solid roller cam. Most hydraulic rollers sign off around 6,400 RPM due to the heavy tappets floating the valves. This is why crate motors have duration of about 230°

Blue prints 383 Camshaft Information:
•Hydraulic flat tappet
•.488" Intake lift
•.486" Exhaust lift
•229° Intake duration @ .050"
•230° Exhaust duration @ .050"
•110° lobe separation

GMPP LS3 (6.2l) 495 hp Hot Cammed crate motor
Camshaft Type (P/N 88958753): Hydraulic roller
Valve Lift (in): .525 intake / .525 exhaust
Camshaft Duration (@.050 in): 219° intake / 228° exhaust

ZZ4 350 •Camshaft Type (P/N 12677151): Hydraulic roller
•Camshaft Lift (in.): 0.473” intake / 0.473” exhaust
•Camshaft Duration (@.050 in.): 215° intake / 223° exhaust

ZZ572 BBC 620 horse •Camshaft Type (P/N 19210721): Hydraulic roller
•Camshaft Lift (in.): .632 intake / .632 exhaust
•Camshaft Duration (@.050 in.): 254° intake / 264° exhaust

Note as displacement increases duration also must increase to move more air in the same period of time. Generally eight degrees are added for each increase of 50 cubic inches over (or under) a 350 base engine.

Cams chosen for the noise they make are like a muffler choice of louder being better. It has no basis in performance (engineering); and is like a kid putting base ball cards in the spokes of his bike. Doesn't make it go faster but makes the owner feel better.

Big Dave
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post #5 of 6 (permalink) Old Nov 16th, 18, 01:22 PM
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Re: EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

Quote:
Originally Posted by Larger Dave View Post
What is the LSA 114° or 106° ? LSA has a huge effect on overlap which is the problem with a long duration cam and computer controlled EFI or manifold vacuum with a carb.

As far as that goes why have a long duration cam if you can not rev it to 7,800 RPM where I shifted my 582 big block with a solid roller cam. Most hydraulic rollers sign off around 6,400 RPM due to the heavy tappets floating the valves. This is why crate motors have duration of about 230°

Blue prints 383 Camshaft Information:
•Hydraulic flat tappet
•.488" Intake lift
•.486" Exhaust lift
•229° Intake duration @ .050"
•230° Exhaust duration @ .050"
•110° lobe separation

GMPP LS3 (6.2l) 495 hp Hot Cammed crate motor
Camshaft Type (P/N 88958753): Hydraulic roller
Valve Lift (in): .525 intake / .525 exhaust
Camshaft Duration (@.050 in): 219° intake / 228° exhaust

ZZ4 350 •Camshaft Type (P/N 12677151): Hydraulic roller
•Camshaft Lift (in.): 0.473” intake / 0.473” exhaust
•Camshaft Duration (@.050 in.): 215° intake / 223° exhaust

ZZ572 BBC 620 horse •Camshaft Type (P/N 19210721): Hydraulic roller
•Camshaft Lift (in.): .632 intake / .632 exhaust
•Camshaft Duration (@.050 in.): 254° intake / 264° exhaust

Note as displacement increases duration also must increase to move more air in the same period of time. Generally eight degrees are added for each increase of 50 cubic inches over (or under) a 350 base engine.

Cams chosen for the noise they make are like a muffler choice of louder being better. It has no basis in performance (engineering); and is like a kid putting base ball cards in the spokes of his bike. Doesn't make it go faster but makes the owner feel better.

Big Dave
Correct, EFI prefers a wide LSA cam. Mine is 112 with 108 ICL. Not sure why you started talking about hydraulic rollers. The OP has a solid roller and mine is solid and bounces off the 8,000 rpm limiter with ease.
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'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #6 of 6 (permalink) Old Nov 16th, 18, 03:01 PM
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Re: EFI w/over 253 .050" cams - Sniper, Stealth Terminator, Pro Flo 4

Quote:
Originally Posted by Steve69SS396 View Post
Holley Dominator ECU, dual O2 sensors, Wilson 105MM LS style TB and Injector Dynamics ID2000 injectors on my car. Cam is 274/286 @ 0.050".

https://youtu.be/xdfZDOpaFCc
WOW that sounds good

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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