Planning my build,have a few ?s.

[Mike Dozier]

Intake manifold heights can vary...I'd think a better
indicator is to measure from the bottom of the engine
mount bosses to the outer edge of the cylinder head
mounting surface on the block. Since the 351 and 302 use
the same heads, the added height of heads would be the
same, given the same heads/valve covers.

MikeD

 

[Gary Gibbs]

Since the motor mounts are the same location on both and since the centerline of the crank runs through the mounting flange of the oil pan (on both), the main difference will be the deck height which locates the heads at 45 degrees above the crank. Hence my previous calculations which include a deck height increase of 1.3". Thus the engine should be .9" taller (and 2*.9" wider); however, since the heads are further a part by 2*.9" there is a possibility that the intake manifold manufactures would start turning the runners up thus making a 351 intake taller then the "like" equivalent of a 302. I would guess the minimum height difference would be .9". Thus I suggested that we measure a "like" manifold on both engines. I happen to have the popular Victor Jr. If anyone else has a Victor Jr. on a 302 it would at least give us one "fair" data point.

 

[Gary Gibbs]

Ok. Measurement from bottom of block to carb mount flange on a 351W with a Edelbrock Victor Junior intake is 15.875"

Any one with a 302 care to make this measurement?