4027596 318 head questions??? Help

Mopar Tim said
Large ports and bigger valves on a small displacement Engine means lower, low end torque. Higher comp. Ratio helps across the board. And they are a roller LA head.

Honestly, after having the two back to back I'd just as soon throw them in the scrap pile if they need valve work- don't value them any higher than another 318 head.

In a 4800lb truck the shade of extra low-end was nice, but it didn't make up for what a severe dog it was turning up. Even with 3.23s I turned that truck up a lot and it ran a lot better with the IIRC 675s and the 4bbl than the 302s and the 2bbl. More cam and flow on that truck would've helped it a good deal, the bigger cams/flow the newer trucks have sure has an improvement. Having it run great on cheap gas with the stock cam's pretty nice too. It stayed down about 2mpg since all the changes, but the extra mid-upper range was nice and definitely didn't help the mpg given the additional driver input.

Compression's nice, but so's better ports. If I have to give up one or the other- it's going to be compression in a heartbeat.

KudaKrazy said
Im building a 68 cuda notch. I have been collecting parts to do a 318 mild build. I have all edelbrock parts such as a 600 cfm carb. 4 bbl intake non egr. Timing chain,cam, lifters (which i cant use cuz i purchased the flat tapped cam n lifters), valve springs. Ect. I was told the 318 i have was a 77 block. But it turns out its a 89 magnum. With roller rockers and flat top pistons. Question is i purchased a set of 4027596 318 heads. To put on the motor. The only difference i see is between the 714 heads are the holes where the push rods go through look bigger on the 89 motor? Is this a prob? Will the 596 heads work on this motor, any help will be appreciated.

A flat tappet cam and lifters can be used in a roller block. About all the 318s came with flat top pistons. If your motor's got a roller cam with the spiders, lifters, and all- that's going to be better to use that or have it reground than to swap to a flat tappet. The later heads do have larger pushrod valleys, but though I've not done it yet I don't see why you couldn't up the early heads up for clearance there.

You mention a lot, but not what ignition you're going to be using. A 318 car that year would've had lean-burn and a 318 truck that year would've had a TBI that controlled the timing with a computer. Do you have an electronic ignition worked out for it yet?