1976 Mercruiser straight 6 point gap

[PX4855]

Trying to find out what the plug and point gaps are for my 76 Sea Ray with a 76 straightline 6 cylinder motor in it. Can anyone be of assistance? Casting numbers on the motor are 328576 GM.

Thanks in advance.

 

[Texasmark]

Re: 1976 Mercruiser straight 6 point gap

Points were set like 1/2 the plug gap in those days as I recall. I don't recall whose block it was, Ford or Chev, but it was rated at 165 hp. For a .035 plug gap the point gap was .017. I have some old Motors and Chilton auto manuals in the shop. When I go outside later I will check my numbers and if wrong will correct.

Mark

 

[PX4855]

Re: 1976 Mercruiser straight 6 point gap

This motor is rated 165 HP...

 

[Chris1956]

Re: 1976 Mercruiser straight 6 point gap

You might post this in the I/O forum. Those guys are experts....

 

[Texasmark]

Re: 1976 Mercruiser straight 6 point gap

I just caught the GM in the p/n that says it's probably a 250 cu in GM 6 which they made thousands of. Chilton says it's .035 on the plugs and .019 on the points.....shucks, I missed it by .002. Grin

Mark