The foundation for a 5.7 Swap

Joe Dokes said

Uhcoog1,


Hemiup,

Since you seem to have a lot of experience building race hemi's. Were there problems due to being inexperienced, chose the wrong engine builder, or too aggressive on the tune, not being methodical, or all of the above.

I knew that you could over-heat a coil with too much dwell, but I didn't know you could cause them to self destruct. Are the Hemi Coils prone to failure?

My hemi is going to be virtually stock, I only plan to add a cam and headers and a slightly larger throttle body. Are there any specific issues with the hemi particularly the fuel injection that presents problems for hot rodders?

Regards,

Joe Dokes

Click to expand...

Joe, probably all the above.

Hemi coils are not prone to failure. However at 950 hp with high cylinder pressures you'll need a CDI to keep the spark from blowing out.

No problem with EFI in a stock application. You can actually use the factory pcm with a cam as long as you keep the lsa at 116 or wider. If you want the lumpy sound of a 110 or 112 the factory pcm can't handle the low vaccumm map reading so you'll need to go with a piggy back or standalone to keep the engine idling in closed loop.

I've invested thousands of dollars into EFI tuning these new EFI Hemi's over the past 5 years. Jet, Hypertech, SCT, SCT Pro race package, Superchips, Unichip, Split Second, iEMS3, SMT6, PSC, AEM..etc,etc. Thats why I'm a big fan of using the MSD Hemi6L with a carb. Its a no brainer.

Jerry