coolchevy wrote:points well taken. If I use those pistons I can't use the Edelbrock heads as compression will be way to high. Will look into other heads choices then.
what do you consider a good compression ratio for a towing engine anyway? I mean higher then the piss pour 8.5.1 ? how far would you go?
I do have the 4l80e 4 speed, that already helps a lot keeping rpm down. I am around 2200 rpm @ 70mph towing speed which is pushing the legal limits already a bit. Germany 68mph, Austria 50mph
HDBD wrote:I had a very strong running tow rig a 94 dually with a TBI 454. I found a set of heads off a 366 truck engine that had a more compact chamber and true oval ports. Used a larger intake valve and some mild bowl work only. Used a mild Crane cam. Picked up 2mpg and noticable torque.
coolchevy wrote: Not sure about headers if they would gain me something or not.
DaveMcLain wrote:So what you're saying is that GM didn't know what they were doing when they designed the 366 and 427 truck engines?