A_Rescue

I'm putting together the parts list for the EFI upgrade on my Monte. Im seeking to know what has been used and reliable for the EFI guys out there. As part of the EFI upgrade I will be rewiring a significant amount of electrical charging and everything else in the system. Charging system will be required to feed Dual electric fans, electric fuel pump, EFI, 400 watts sound system, lights and A/C at full blast at idle on a hot day(looks like a 140 amps charging system will be needed for margin). More to come on that I am curious what others have used for fuel delivery systems. I see three options. Option 1 is an external pump and filter(s) using the existing tank Option 2 is an internal fuel pump kit using the existing fuel tank. Option 3 is a new tank designed for EFI with the pump included (Holley stinger) Option 1 is the external pump/filter. Advantages are price and easier installation (Sometimes) and repair. Not sure where to put the pump and be physically below the tank and away from exhaust. Option 2 is the internal pumps kits for existing fuel tanks. Easier installation but the tank wont have a sump and in hard acceleration the pump may get air bound. The tank is 50 years old, not sure if its immaculate inside for EFI. medium price Option 3 is a new tank designed for EFI, complete with pump and pick ups. 600 bucks... bolts right in... clean tank with the specified flow rate/pressure Also I'm wondering about safety and interlocks, with these flow rates I want that pump off if I get rear ended, or lose oil pressure, or low fuel pressure. Did you include low pressure cutoff switches? Did you include an interlock through the Oil pressure sensor? Did you include an accelerometer shut off in the event of impact? Love to hear what's been done and working out there.... thanks in advance john

ill share the rockers chosen and the results when i pry my wallet open... Im doing a restore on a 71 monte ss and there seems to be a conflict between what I make and what i am spending right now.... HEHEHE

Well folks I did what i could, that truck is just going to sound like a rock tumbler. Thanks for all the feedback and especially the feedback from others who have used this comp cams set up too... I'll borrow what was said here... ill say they are solid lifters....hehehehe on a good note...On my Monte... I put the hellwig sway bar on (lots of stuff to change from a drag racer to a street car) and took it out for a drive today. wow.... gotta love a well built big block.... thanks for the support guys!!!

I am looking at a new set of roller rockers with ball bearing trunions. That will free up 20 or so horseys and they wont care if I change the cam or lifters... lots of options... its only money... Thanks Steve, i'll record the valve train audio tomorrow when I fire it up... two simultaneous projects....

OK... got back into the valve train issue today.... checked rocker geometry and the pushrod length is spot on. then checked seated spring pressures and saw 130 to 170 with most about 150 lbs. Comp wants 1.9 inch installed height at 120 lbs. a little heavy on seat pressure but that should help the steep rate of rise on the roller cam. valve is showing roller contact in center of valve stem. pushrods straight and correct sizes.... reset all lifters to a 1/4 turn past 0 lash and I will fire it up tomorrow. The disappointment in NOT finding something wrong that is making this valve train scream is getting to me... back at it tomorrow and if its loud again i'm going to live with it... I advise staying away from this kit from Comp.... kit is for a roller cam conversion designed specifically for the BBC Gen IV and Gen V... irritating to keep taking this thing apart... OK enough whining... http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=441&sb=0

ended up here, I have used them before and was pleased. I have some on CD for other vehicles Mark and they are quite complete, but I prefer to take notes and flip pages... Like Aaron says... greasy fingerprints... I ordered 4 manuals, GM shop manual, GM chassis repair manual, GM electrical wiring, and the Chiltons repair manual 81 bucks... https://books4cars.com/listings.php?findmake=Chevrolet&model=Monte%20Carlo&year=1971&type=Shop

Steve, the formuas look good, but actual tire slippage is not accounted for. At 70 MPH, depending upon tire traction, there would be greater than the math tire rotations to be at the actual speed. This should not be 10% tho, 3 to 5 % max at 70 for slippage is what I would expect. The RPM/timing light or an additional tach would verify the degree of error in the dash tach. john

I have been searching for the complete set of GM shop manuals for the 1971 ss454. There are options out there but I am not sure what to go with, prices are all over the place. Manuals on a CD are available and reasonably priced but I prefer paper... Any recommendations? Thanks john

first interstate is a good battery company, makes a good product, and I prefer to spend my money with them for OEM replacements....

Im thinking spark also, the coil probably, easy/cheap change... as the AFR decreases (more fuel/enrichment) in the cylinders the spark plug spark gap dielectric resistance increases and the coil cant support the energy... coils can short on the primary one winding at a time and its progressive until the missing starts... heat accelerates this and a shrink tubing gun on the coil could help if the misfires are the coil and thermally aggravated... check the coil/plug wires...

Thanks for the Update Paul... good stuff john

HEHEHE....

Thank you Paul, I too have done alot of research and work on EFI and the engine controllers out there. I cut my teeth on an Edelbrock MPFI conversion from a OBD1 TBI 454 in a truck. I used the stock PCM and cut out the factory chip and replaced it with a E squared Prom. The stock OBD1 system advantage at the time was the knock sensor retard capability that was not available on the ECM's a few years ago and transmission controlling of a 4l80E. knock sensing and retard during the initial tune and if you transition through limited Octane zones (California 91 max) can save your motor. knock sensor counts versus RPM are a critical EFI tuning tool... VERY CRITICAL if the motor is built. Detonation is killer... been there... done that... paid the price! The single narrowband O2 sensor feedback method is a problem for dual exhaust, with or without a crossover, which side do I put the O2 sensor on? It cant be both.... The single O2 sensor feedback method relies on all 8 cylinders running the same, each bank of 4 being identical. So monitoring and deriving AFR feedback from one set of four cylinders means one bank of 4 cylinders is assumed to be the same as the O2 monitored set of 4 cylinders. keep that in mind, it is OK as long as everything is OK... Megasquirt and Holly (Dominator) are the only PCM's that have knock sensing and dual (or more) wideband O2 sensing/feedback capability and transmission control capability. Holley Dominator will control a 4L80E but not the 6L80E (Yet, I am waiting for it). Additional deficiencies of all but megasquirt and the Dominator is the VE tables near idle are to course to effect a good tune with a motor that has been modified. Paul touched on the minimum vacuum issue above quite well. I circumnavigated the issue by adding more rows of VE at smaller RPM ranges from 600 RPM's to 2000 RPM's increasing my resolution. so instead of having 4 adjustment ranges of 500 RPM's each (ie. 1000 to 1500 RPM's), I created tables with 125 RPM ranges for "Near Idle" VE lookup tables. This was effective as witnessed by the variation in the VE tables below 2000 RPM's at each of the 125 RPM ranges, dramatic changes required to properly fuel the big block near idle. Big difference in driveability with the up camming effects on vaccum and air flow in the heads... I have gone through a lot learning on EFI systems and I fully embrace the EFI world. Once I learned how to use the mouse, computer, EFI tuning software, chip programmer/burner, data logging software I was doing it. The EFI gives us the capability to have different jetting/timing at any RPM by hitting enter... Hotel Sierra I could go on for hours on this subject... happy to respond to questions... john I am currently anticipating

when I replaced the lifters Friday with new ones, I inspected the rods, cam, and everything I could see. I am not going to get back to it until later this week. I'm gonna go with zero lift at first and go a 1/4 turn each time after and see where they are happy...if they get happy. I will pull the coil lead and make sure we are oiling out of the pushrods. Ill make sure the pushrod length is good by insuring the rocker roller is centered on the valve stem. Ill check the valve height and depth.... This has been going on for a while and comp cams tech help has not been very helpful... lots of complaints on the summit and the comp website for these lifters. good thing it was only 100 degrees Friday.... 'thanks guys

ya steve, Comp cam hydraulic roller cam p/n 11-423-8 a kit to retrofit to a roller set up....

yes we are oiling Steve we are swimming in it, 60 psi cold oil pressure, melling high volume oil pump.... also new

Thanks guys I have tried zero, a 1/4, a half, and 3/4ths of a turn on all of them multiple times with the same or worse results. Then bought a complete new set of roller lifters because I couldn't hear exactly which one was bad and I don't want to keep tearing the intake off. Installed them at a 1/2 turn and same clacking. The rod height is correct if the rocker roller is in the middle of the stem....? I'll start again at a 1/4 past zero lash.

Not my monte but my 95 454 truck rebuild i am close to completing and the valve train is way to loud. Replaced the entire set of lifters today put a 1/2 turn past zero in them and the same noisy clacking valve train. This is a comp cams roller conversion kit for the 95 GMC and the only difference is the edelbrock 60499 head vs. the stock heads. This is driving me nuts, what am I doing/did wrong? any help is appreciated 1995 gmc 7.4 liter rebuild. Edelbrock 60499 heads Comp cam hydraulic roller cam p/n 11-423-8 Comp cam hydraulic roller lifters p/n 854-16 Cam valve springs P/N 924-16 Cams retrofit pushrods P/N 7815-16 Comp cam retainers P/N 7411-16 Comp cam roller timing chain P/N 2110 Flat top pistons, 30/1000 over, edelbrock MPFI john

Just purchased this kit, has every stripping required, rubber seems soft and came with quality adhesives. https://www.weatherstripspecial.com/ info@weatherstripspecial.com Order Details -------------------------------- Item : 1970 1971 1972 Monte Carlo Weatherstrip Kit for SS and Custom SKU : 7072DKIT Quantity : 1 Item Price : $339.00 Item Total : $339.00 john

Glad we are having this conversation... Ill need a hood scoop for the tunnel ram of the pro-flo XT EFI system I plan replace the 900 CFM double pumper with... if careful will the fiberglass hood, will it hold up with a finish or should I entertain a steel hood Steve?? https://www.summitracing.com/parts/edl-71363/overview/ john

Latches... latches... i dont need no steenking latches.... The hood is not that heavy either... wondering if it needs reinforcement prior to paint... hate to screw the paint job up flexing the hood... john

Ahhh steve, thanks... It is a very big hood for sure... Is there any other considerations with the fiberglass hood? Think I should i try to fit a latch to it or rely on the hood pins..... john

I have the fiberglass hood on the 71 and it has a scoop. There are hoodpins, no latch, and no springs.... OGPI has two types of springs, one for steel hood and one for fiberglass hood (Twice the price). not sure what the difference is since the webpage is not very descriptive.... https://www.opgi.com/monte-carlo/1971/sheet-metal-body-panels/hood/G200016/ https://www.opgi.com/monte-carlo/1971/sheet-metal-body-panels/hood/CH20357/ Does anyone understand the need for "fiberglass hood springs" for the fiberglass hood? I am thinking they might be lower tension springs to prevent bending of the hood when closing it.... not sure john

very good info guys... thanks. I am going to buy buffers and a polishing kit. What tools are the best for a newby to learn on? The polishing kits from 3M are catching my eye... john

Wow... great feedback! Thanks As the time for paint selection nears I am getting really excited... next i need to learn how to bring the finish out..... john