Check out this Piston
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pontiacgp said:
That's what I was trying to figure out... haha. Just because you have 3.73s and th350 doesn't grant you 8500rpm. That's a pretty common set up and it's one I even run. I feel like if I ran mine past 6000 it would kill it's self. That's with a great valve train and forged rods, crank the whole deal.
on our 602 crate race engine by the rules we run a 6300 chip which we hit about 3/4 down each straight on a 1/2 mile track. I have known some who have played with the chip and have run their rpm higher than that, probably to 6500 or 6600 and that usually results in a broken rocker or bent pushrods at some point.
I was running 1.5 stamped steel rockers, stronger than stock pushrods, and 2.02/1.60 valves in iron heads. Was it making much power at 8500rpm? No not really, I just wanted to see how it would do that high in the rpm range since no one really takes their motors that far.
as far as power on our 602's they start to lose power after 5900 rpm...alot of the tracks in the US use the 5800 chip and I don't think they are much slower than us..
1st off, the hole in the piston...only thing I could even think of is either an attempt to lower compression a little bit or part of some ones balancing process. Not really sure though, you got me.
I used Eagle rotating assembly, works great. I have heard of quality issues with Eagle and Scat also. I do feel that Scat may be a better product though. Price on Eagle is what sold me.
I used Eagle rotating assembly, works great. I have heard of quality issues with Eagle and Scat also. I do feel that Scat may be a better product though. Price on Eagle is what sold me.
I built the motor, and my father and I didn't half *ss the build on this nor tried to lower compression. These were new pistons when we put them in, and that is how that one came out.
Yes the tach is set right. Idk what the top speed I hit was as my speedometer only goes till 80 and I didn't have a cop pulling me over to tell me how fast I was going lol. It wasn't all that fast, figure probably around 110 or 115 because of the gearing and 3 speed automatic which limits me from a high top speed.
Yes the tach is set right. Idk what the top speed I hit was as my speedometer only goes till 80 and I didn't have a cop pulling me over to tell me how fast I was going lol. It wasn't all that fast, figure probably around 110 or 115 because of the gearing and 3 speed automatic which limits me from a high top speed.
That was my guess.. a tach that is focked up or on the wrong setting. Or memory or dyslexia. If you hit 8,500 with your setup you will need to get it off your garage floor with a scoop shovel & kitty litter. RPM stands for ruins peoples motors. You never want to turn anymore rpm than you have to in order to make the power you need ie a few hundred rpms past peak HP. Ability to turn it way past horsepower peak only serves to make less power, slow you down from your best acceleration and raise stress & wear on your engine EXPONENTIALLY. Cam, gears, valvetrain, & rotating assembly should be set up to compliment each other. Turn too much rpm and you will find the weakest link. Had a local kid stuffed a cam in his 455 Pontiac that said it would make power to 7,200. After throwing it in his car along with some 4.56 gears he promptly scattered the bottom end.
PS No one is dogging you just saying something there does not add up.
PS No one is dogging you just saying something there does not add up.
I can list out my whole setup if it gives anyone piece of mind. The cam was a small summit cam (.442/.465), thus it was not putting a lot of stress on the valvetrain. The tachometer works fine, brand new autometer tach, set on v8 setting hooked to the distributor. Should I have taken it that high, no but it was something I wanted to try. Most of my drivetrain is not mix matched either. Most people mix match their drivetrains which is why they blow apart at the first sign of stress.
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