Lets choose a blower cam

[Paul_G]

Time to get the teeny cam and valve springs out and put in something that belongs there. When I put this 440 together it was just supposed to be temporary since the engine in the car was hurt. Well, now it is going to stay.

What it is;
69 Road Runner convertible
1976 440 truck engine, iron heads, fresh rebuild to stock, ring gaps opened to max spec.
OD automatic, LU converter speced @ 2800 stahl
410 Dana
F1 Pro Charger, making 10 PSI when over 4000RPM

This is a street cruiser not a race car. Dont want anything radical, just a cam that will let the engine breath and sound good.

I had this cam so it went in to the engine when I rebuilt it, like I said, it was supposed to be temporary.
Comp XE256H-10, 212/212, 0447/.455, 110 LSA

 

[PurpleBeeper]

I’ve never run a supercharger, but I think you need stiffer valve springs to keep the valves closed under boost. I believe low overlap helps maintain boost as well (?)

 

[dvw]

Wide lobe center and extra exhaust duration. My blown 340 from memory is around 245/255, 540/560 112 lca. For years it had 214/224, 447/467 114 lca. The bigger cam with a looser converter was worth .7 in ET and 5 mph. Drives the same on the street. Even when it had a tight converter it drove good. With the bigger cam and tight converter, it was no quicker in ET but was still the 5 mph faster.
Doug