FLPACKERBACKER
Member
just wondering if anyone has had a 3x2 intake extrude honed.was it worth the money or am I better of leaving it alone?plan on doing a 4 inch stroke 348.probably 11.5-12.5 cr with aluminum heads.
eric
eric
Skip, the Pontiac tripower intake is a lot better piece than the 348 intake. Dave at SD looked at a 348 tripower intake for me some time ago...... he said "don't use that thing"...... and he does lots of Pontiac tripower engines.
Dave
I wondered the same thing Cecil, there is a bit to be gained by gasket matching and blending the runners in about an inch or so. 1/2" phenolic spacers give a tad more plenum volume. Blocking off the heat passage will help performance. You could try and open up the divider between the ports. You may be able to squeeze a little more out of the three two setup. Still, all in all you would be better served with a good after market single four or dual four setup if your looking for max power. Don't get me wrong, I'm a big fan of the three two setup. You can make a real street screamer with three two's. Throttle response is phenomenal and you get to sip fuel through a two barrel when you don't have the wick turned up! If you insist on a three two manifold I have one that has the heat crossover blocked and the dividers opened up a bit. I will even gasket match it for you and blend the runners.The Pontiac intakes use bigger outboard carbs. I always wondered if a 348 intake could be modified to take the bigger pony carbs and if so, could the ports and runners be worked enough to take advantage of it.
Wow, people read these old posts? I'm going to be in the shop today. I'll dig that intake up, if I still have it! I may have sold it, can't remember. Basically there is a divider under each carb mount. You would start by grinding a slot right down the middle. Do it a little at a time, don't gut it. The goal is to use both carb barrels instead of just one. You would want a 1/2" phenolic spacer on all three carbs also. Actually by using the spacer you are doing kinda the same thing. You definitely want to block off the heat passage.Fathead racing, do you have any pics of how you opened up the dividers in your tri-power manifold? Or a good explanation of how you did it? I'm not experienced in this area at all so please bare with me.