Hello out there. I have recently stumbled on to this forum, I have learned alot from the postings I have read.

My project is a 1981 F150 4X4 with a 300 I6 that is being replaced by, you guessed it, a 460. I am keeping the T18 4spd Trans and the 9" rearend, I think they will be strong enough to support this engine.

I am rapping up my engine build now, and just wanted to check if what I have done is O.K. or if I am going to run into any problems.

The engine is a 1976 smog buster with the big combustion chambers and the whole egr workover, i am ditching that. The block was cleaned up w/a .30 bore, I bought flat top hypereutectic pistons to yield about 8.5 to 9 comp. I used a comp 4x4 extreme cam, not sure of the grind. I left the heads stock, but replaced the factory springs w/ comp springs. I am using an edel. performer 460 intake. I am planning on using the stock Duraspark II ignition with a distributor out of a 1984 460 truck. I have a 600 cfm holley that was on the same truck motor, I am not sure if it is big enough.

L&L Products is going to provide the swap hardware, they are about 80 miles from where I live, the only conveniant thing about this swap.

Just wanted to know if this is a good platform to start with, this is my first build.

Sorry so long winded, Thanks

 

Sounds like a pretty well matched combo, try to dig up the cam specs if you get a chance. I would say a 600cfm is on the small side, you obviously have performance in mind with the parts you listed so I think a 750 vacuum secondary carb would be perfect for your application.

 

I agree that the carb may be a little small, but if you have it, try it, you can always change later. After that, maybe a MSD6 ignition would help, it all depends on the intended use of the truck. Otherwise, sounds like a good truck motor. Did you port mach the heads, intake, and exhaust manifolds? If not, do this before you get her all put back together, it will make a difference!

Nathan

 

Thanks Chilly and Nathan.

Chilly, you asked for the cam specs, Comp says advertised duration is 262 int.,270 exh., @.050 duration is 218 int., 226 exh., valve lift .514 int. and .524 exh.

Nathan, unfortunately i did not find this forum in time to know enough to port match. when i talk to my local machine shops, they tell me for truck applications it not worth it, (more power is always worth it in my opinion). If the truck does not perform good enough with the cam I've selected and L&L Products Headers ill jerk the heads off and clean them up, just gives something to look forward to doing.

I am definitely going with a 750 cfm, now which would be better, edelbrock or holley?

Heath

 

That's a pretty good cam, we used a very similar one in our 460. Ours is 216/228 .518/.513" You have a very good torquey truck motor with good hp up through 5400-5500 rpm. One thing to look at, you're on the low side for compression with that cam but not too bad. With the valves open for a longer amount of time, the piston isn't compressing the mixture as much so you need the compression increase to keep it at a "normal" level. Now that I see the cam specs, a 750cfm is definitely the choice I'd go with, it's what we put on our 460 (which is very similar to yours). You'll hear the same thing about the carbs: Holley for better performance and tune-ability, the Edelbrock for ultimate reliability and ease of tuning (not many variables). I've run both a Holley and an Ebrock, personally I'd go with a vacuum secondary Holley on your engine.