670/ 670ho differences?

[maxnorfolk]

Just wondering if anybody actually knows the difference between the 670 and the 670 ho engines?

 

[Zachmandu]

I've posted this a couple times before-

X/H.O. - notch cut in rear of cylinder sleeve to open up rear intake transfer, 44mm carbs (40mm on std), short intake boots, RV cover with larger openings, factory tunnel-porting, flat-top pistons, different squish on head domes, RV valve with more induction timing, larger volume pipe........

That's about it. Ignition is also different, as the X/H.O. engines use DPM

 

[Ride2Live]

I believe the timing is advance due to the key slot on the crankshaft is a couple of degrees different than a regular 670 motor.

 

[H20SKE]

I believe the timing is advance due to the key slot on the crankshaft is a couple of degrees different than a regular 670 motor.

Correctomundo on this--it is keyed differently, zachmandu is correct on the rest---should have the 501 rotary valve too.

 

[Bullgod]

I've posted this a couple times before-

X/H.O. - notch cut in rear of cylinder sleeve to open up rear intake transfer, 44mm carbs (40mm on std), short intake boots, RV cover with larger openings, factory tunnel-porting, flat-top pistons, different squish on head domes, RV valve with more induction timing, larger volume pipe........

That's about it. Ignition is also different, as the X/H.O. engines use DPM

How bout the 95/96 Mach 1 (1 stamped on the head) how do they differ from reg. 670 and 670 X/H.O. motors?