Thanks guys , I need to be informed on the steps in replacing a cam and springs in a 272 Y. I bought a rebuilt 272, bored and honed to the next size pistons. THis motor was only run for 1 hour as a break in time. It has a stock cam (reground) in it now and I want to put in a Y 284 S Sat.Nite Special cam, with the VS105 springs. The tappets are new also. Can you guys tell me the way to go about this. Do I need to take the heads off? How do I hold the tappets off the cam? Please give me all and any information I could use. I never worked on a Y block before. This motor is going in a 34 Ford Pickup RatRod. Thank you in advance. Dave.
All you guys that have built a Y block motor , please inform me of the best way to do this. Thanks
Quote:
Originally Posted by flat6inline
Thanks guys , I need to be informed on the steps in replacing a cam and springs in a 272 Y. I bought a rebuilt 272, bored and honed to the next size pistons. THis motor was only run for 1 hour as a break in time. It has a stock cam (reground) in it now and I want to put in a Y 284 S Sat.Nite Special cam, with the VS105 springs. The tappets are new also. Can you guys tell me the way to go about this. Do I need to take the heads off? How do I hold the tappets off the cam? Please give me all and any information I could use. I never worked on a Y block before. This motor is going in a 34 Ford Pickup RatRod. Thank you in advance. Dave.
You will need to remove the heads to replace the springs. To get to the cam, You have to remove the carb, intake manifold, valley cover to access from the top and everything on the front. I highly recommend getting a shop manual and this book. http://www.amazon.ca/Ford-Y-Block-Re.../dp/087938185X
you can change the springs without taking the heads of.i guessing the engine is out.if it is its a small job.if its on an engine stand flip it upside down and that will keep the lifters from falling out.make sure you lube the cam good and put in the right oils.
With that much cam, you are going to have little to no get up and go below 2500 rpm, given the probable low compression of the motor. Unless the builder made a very special effort, your 272 would be lucky to have 8 to 1.
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1946 1/2 ton with 305 cu in Y-block
1990 Ranger 4WD
Thats what I thought, yes its on a engine stand. I was thinking the same thing today as I was driving my truck, Just turn it over and turn the cam a few times to make sure the lifters are up and out of the way. Thanks for the answer. Now the other responds was this, that the 284 S cam is to much for this motor. Is that true, with the low compression. Having been told that, what would a person use ? It will be in a 2500.LB custom frame 34 Ford pickup Rat or as I feel Hotrod. The trans is a T5 Mustang with 0.79 OD. with 3.58 banjo rear. I want to run ( and have) a Four barrel small intake with on top of that a aluminum Y intake tunnels , with 2 Rebuilt 94's . Does anyone have any idea if this stock cam will work with this. That's why I wanted to go with the 284 Special cam with 105 springs, But if I will not have vacuum , and will not be any good at all under 2500 rpms, that's not good. Any thoughts. I have not ordered am cam as of this writting. RatRoDave
Quote:
Originally Posted by 312
you can change the springs without taking the heads of.i guessing the engine is out.if it is its a small job.if its on an engine stand flip it upside down and that will keep the lifters from falling out.make sure you lube the cam good and put in the right oils.
IMHO, stick with the stock cam. It will give you very good low end torque, idling, mileage, vacuum and doesnt require high spring pressures that accelerate wear on the lifters and lobes. If you had at least 8.5 to 1 CR, you could try the 260 degree cam Isky offers, or one of similar specs. The Isky 260 actually calls for 9.5 to 1, but I put it into my new 292 with 9:1 CR anyway.
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1946 1/2 ton with 305 cu in Y-block
1990 Ranger 4WD
Thank you so much, Do you think I will be able to run these 2- 94's with this stock cam then? That sure would be nice and I will not have to take this motor apart. The motor has been bored and honed to the next available size. ( Not sure what that is) new pistons rings , crank reground and Microfinshed,Camshaft reground. new lifters. remanufactured rockers, pushrods , valve etc. heads all worked over. new rods , mains, cam bearing , gears and chain. 3 angle valve cuts. 1 hour of run time. If you think this stock cam is good enough , thats all I want. I could jet these carbs anyway I need to if that's the case. Does anyone know then how I should have these 2 - 94's set up. to compare to stock carb.? Thanks everyone for the great advise. I will keep reading what everyone sends my way. RatRoDave
What is stock compression on these 272 motors and do you think this one has more????
Quote:
Originally Posted by 46yblock
IMHO, stick with the stock cam. It will give you very good low end torque, idling, mileage, vacuum and doesnt require high spring pressures that accelerate wear on the lifters and lobes. If you had at least 8.5 to 1 CR, you could try the 260 degree cam Isky offers, or one of similar specs. The Isky 260 actually calls for 9.5 to 1, but I put it into my new 292 with 9:1 CR anyway.
I didnt mention it before, but your project sounds really cool. The 272 will push around the lightweight truck nicely. My truck weighs 2700 lbs. which is close. As for the carbs, just give them a try and see how it works out. Maybe someone here can help with jetting, if not try the Ol Skool site. I dont think two 94s flow a whole lot of air. But something will limit rpms, be it cam, carb, valves, etc. The motor I just tore down had a little 2V stock 292 autolite in it with a .460 lift 270 duration cam. Lots of mismatched parts in there. The CR was 7.10 approx. Power band was 2800 to 3600 rpm with absolute rpm ceiling of 4000. The low compression combined with cam, big valves, high rear end, and blue thunder intake necessitated the little carb to get it to run close to right, though it never was.
Regarding CR, you can look at www.ford-y-block.com for a reference. Mummert doesnt list many of the earlier heads in terms of either cc displacement or CR. Recently I cc'd a 272 head lying around here and came up with a whopping 81 cc's.
Irregardless, your motor will do you well.
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1946 1/2 ton with 305 cu in Y-block
1990 Ranger 4WD
94's are rated at ~185 cfm so your duel setup should be 379 cfm. I'm assuming your not running progessive linkage?? I'm sure that's enough for your engine. One of the biggest mistakes people make besides over camming is over carbureting.
Wish I could help you with jetting but I am running three 97's with progressive so mostly I'm on the center carb only around town.
Guess that should be 370 cfm for the pair, sometimes the head said something and the hand does something else... I think it's called Old Timers or something like that, I forget.
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