a 347 with GT40 heads is a terrible combination. You should go with at least a 205CC head for a 347 .
Keep in mind that gt40 heads are still a stock head.
It's not going to make great numbers, but it's not going to hurt anything either. When I did mine 8 years ago, my bottom end was toast and needed a rebuild. I couldn't afford an entire engine, so I built the stroker and worked over my existing heads. Car ran very well and went well into the 12's. 3 years later, I was able to afford a new HCI combo and already had the bottom end in place.
I would never recommend the combo, but if the heads and intake are already there and you cannot afford all new stuff, go for it. Just have reasonable expectations for the outcome.
I will warn this, a 347 with small 59cc gt40p chambers will be a little more difficult to run on pump gas without detonation. Its doable, but will require some planning which may not be cost effective if on a budget. This is the reason I went 331 vs 347 at the time of the build. I would have preferred the extra cubes.
Joe
No matter what the nay Sayers say if you can run 11,79 @117 MPH your combination is doing OK. GT 40 heads are not the best but your numbers are showing
that they do the job. I know some one that runs a 331 that runs 9 seconds but he is not on a budget and has all the best parts.
Ok. then if I have a 302 it can be bored out to a 331 or 347?HCI = heads, cam, intake
Stroker is an engine that has an aftermarket crankshaft that increases the distance the pistons travel up and down in the bore.
Cubic inch displacement is the volume of the bore when the piston is at the bottom of its stroke.
Total displacement ie, 302-306-331 etc, is calculated by this. Bore x stroke x number of cylinders.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?