I have a 327-275 hp small block Chevy and bought the Edelbrock package 7102 cam 60899 g4cc aluminum heads and ram air gap 7501. Edelbrock claims 420 hp with a 350, so with a 327 I thought I would get at least 375 hp, but it only dynode 285 at the wheels. So, I figured about 330 hp ran a 14.00 sec. e.t. I ran that before I did all this upgrade...any suggestions? Thanks.

P.S. It is a '67 Nova

Dear '67 Nova,

Here are my thoughts on your combo:

The 7102 cam has a 112 degree lobe separation with a 107 degree intake centerline, which I feel is a little wide for a 327 engine. This would be fine for a larger engine or a four-speed, high rpm combo. Something around 108 degree l/s and 104 degree c/l would be better.

Your cylinder heads are good and your intake manifold would benefit from a 2" spacer. Next I would look at carburetion. A 650 double pumper would work well.




Hi, I just read some Q & A on Drag Racing Online. We race the traditional style Pontiac engines (455's) and getting peak hp to move up in rpm just doesn't seem to work. These engines make some pretty amazing torque numbers also. Do you have any theory on where 4.350 bore 4.000 stroke vs. 4...350/4.350 and 4.350/4.500 stroke engines with a deck ht of 10.230 will make peak hp, and if a short deck block was make would it run rpm then? I'm at the point where I am putting more cubes together and moving rpm down even more with the big stroker combinations just because they will get me to 900 hp.

Also, does anybody make an overdrive transmission that can handle big power? I've been thinking about or tire rpm vs. the comp guys who will spin their engines 9800 rpm and more. We've hit peak hp in our best rpm engine at 7800 (499cid 4.100 stroke 920 hp) 2000 rpm short of their tire speed. We can grunt gears pretty good; we would just like to find some more speed.



Here are some things that I have found on the dyno and at the track:

  • Big stroke and bore engines make a lot of torque and hp and do not require a lot of rpm.
  • Short stroke and big bore engines make a lot of hp and higher rpm, but torque suffers.
  • Tall deck is beneficial because a longer rod is required, which keeps the piston straighter in the bore, making more hp and torque.
  • Any combo will have high rpm with lots of spring psi and good valve train.
  • The comp guys rev their engines to the moon to keep momentum because they are pounds per cu. in. racers.
  • As far as trans., call Mike's.



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