Hi,

I'm about to begin a mild 292 build for my 64 f100. The 292 will be mated with a T5 and the stock 3.89 gear ratio. I will drive more on weekends and to car shows. I would like something that is fun to drive. What does everyone think of this combo:

-ECZ-G Heads
-Mummert Intake
-Mummert Cam: Y270, Y280-I-7, Y280-I-11, or Y284. 
-Ram Horns
-4 barrel carb (undecided)

I already have the ram horns and bare ECZ-G heads. With respect to the heads, is it worth having them ported? It is an additional $500 ($900 total). Would it depend on the cam (mild vs aggressive)?

Also, which of the Mummert cams above would be best for this combo? I would rather not have to pay a lot for additional machine work.

Thanks.

Nick

If you don't want to pay the xtra $500 for porting, then having them mildly milled will be worthwhile. If they are unposted "G" heads, they should only be cut about 0.025" according to our moderator Ted Eaton. Obviously, a good porting job would be beneficial, but there's the cost & not just anyone will get the porting right on those heads. A hogging out of Y heads is not the answer.. Of the cams you listed, more than one would be satisfactory, but the one that I've seen a write up & Dyno test on, that really impressed me, was the Y- 280-1-11. It gave a  great torque figure & apparently has a decent idle. But, best contact Mummert's shop  for advice, have all  your specs together when you call...  Almost forgot the 4 Bbl carb, & you'll get many recommendations on them. If you want to keep it more on the regular driving side of the coin, two carbs that Ted tested some time back, that scored near the top of 16 tested, were the Holley 465 cfm & an older Ford Autolite 1.08.   


Paul

In the most recent issue of Y-Block Magazine, Ted got just over 1hp/ci without ported heads.  Rob has achieved pretty much the same, http://forums.y-blocksforever.com/Topic110858-1.aspx.  Thats ~300hp without porting.  If that will be enough for you, study those and maybe outright copy them.  If you want more than 300hp, then porting is necessary.

You'll prabably want 650cfm at the minimum for your build, vacuum secondaries.  The Summit 750 carb has been working very well, and it's cheap, uses mostly Holley parts, so tuning is easy.

You might want shorter rear gears and positraction, but cross that  bridge when you get there. 275/60-15 tires fit well on 8" rims with 3.5"-4" backspace - get under there and measure.  You're going to need every bit of rubber you can get on the road.



Lawrenceville, GA

Thanks for the replies.

Would milling the heads effect the intake as far as getting a good seal? Would the intake need to be milled to match? Also, would porting lower the compression due to the larger chambers? Not sure which route to go with regard to the porting. I think 300hp is plenty for what we are looking for.

I also plan to have the engine balanced by Ted.

This is our first Y-block build, so any help is welcomed. 


 

Everything else equal, milling the heads requires that the intake or intake flange on the head be cut as well.  However, new composition head gaskets are about .030" thicker than the factory shim gaskets so you can cut a total of about .030" off of the heads and block without having to touch the intake, if you use composition head gaskets.

Polishing the chambers will increase the volume, and therefore decrease compression but all of the other work more than makes up for that small loss in compression.  If you will be happy with a Max of 300hp, then don't bother with porting.



Lawrenceville, GA

64.. To me everything hinges on what are your plans to do with the truck when it's done. 300 HP is great @ 6400 rpm light to light but if your cruising down the hyway at 65 @ 2000 rpm you want it to move without downshifting 2 gears. These Y's have great torque and for the most in a cam change you might want look where it starts instead of where it ends. Advancing it helps here too as does smaller venturi carbs like the H-465 and the Autolites when there are setup for your vacuum. Back in the day a 292 with 2 barrel could out run a 4 barrel when the light changed, not on top end of course. Good luck with your project.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

The gearing in general should be fine.  These trucks are usually within about 3300 to 3500 rpm at 65mph in drive, 1:1.  A typical T5 will be .7 -.8 overdrive, so somewhere in the range of 2300 to 2800rpm in overdrive.  Perfect for a mild street engine.

Mine works out to about1800rpm at 70mph (.63 overdrive) with an engine not too much different than the one he's talking about.  I think it will like more RPM at cruise and I plan to make changes there, but as is, it averages about 16.5mpg, toward 20mpg on flat road, and around 12mpg through the mountains.



Lawrenceville, GA