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Comment by Spike on October 14, 2009 at 9:28pm

I'm curious, with a name of MR250Shot, would I be out of my mind that he plans on Nitrous being in his future ? If so he is best served by Forged pistons. If he runs the stock CAST pistons, he probably get by with up to 100 hp shot !?! Maybe.
But don't use Hypereutectic pistons. While they are stronger than cast, they will hold on right up to the time they crack & shatter, sending litle bits of hard aluminum to beat the chamber & cylinder before creating mayhem in the bowels of the engine. After all that verbal diarreah!
Nitrous + Forged = good ... Cast=usable with care ... Hypereutectic=BAD

Comment by Gene-0 on October 14, 2009 at 8:17pm

Aaron, I would guess you might have a bad sending unit or your oil pump is weak/plugged. As you start to drive your oil pressure rises turning out the light. The best way to check is to use a mechanical gauge to check the pressure at operating temp. a good range would be between 30-50psi. My 92 S10 4.3l V6 runs at about 35-40psi warmed up at idle and 45psi under load, but my 85 305 V8 Iroc warmed up will show 25-30psi at idle and climb to 40-50 psi under load. Odds are it's the sending unit, but Kevin, Jack or Jerry may have some other ideas for you.

Comment by Kingman Kid on October 14, 2009 at 5:30pm

Hey Kevin and Spike,
Am I on track with the info for Mr250Shot and his build or should I go back to school with my math?
Jerry

Comment by Kingman Kid on October 14, 2009 at 5:24pm

Since you are at .060" over now, I don't think boring more would provide a nemefit. Stay with a flat top piston to keep the compression ratio under control. Stock Rods, .060" over bore and 119cc Combustion Chamber, if my math is close would put you at around 9.4 : 1. Stock pistons without power adders should be good for up to around 525hp or a little over. If your pistons are flat top and in good shape, re-use them, if not, Scat makes a good set as do TRW and WESCO. Let your budget be your guide. Check out Jeg's, Summit, etc... and see what meets your budget and covers your needs.

Good Luck and Have Fun

Kingman Kid
Jerry

Comment by mr250shot on October 14, 2009 at 4:56pm

ok thxs. what type of pistons would u say i should use.

Comment by Kingman Kid on October 14, 2009 at 4:26pm

Hi Mr250Shot,
To answer your question. Closed Chamber Heads are a smaller combustion chamber, which as a norm run under 110cc chamber volume, which builds compression without the need for domed type pistons or custom rod lengths.

The Open Chamber Heads run larger Chamber Volumes ( such as the Patriot 119cc ), which enables a lower compression ratio and allows for the use of today's standard pump fuels, without using domed pistons and / or custom rod lengths.

Hope this answers your question, and I HOPE I GOT THAT RIGHT ! LOL

Kingman Kid
Jerry

Comment by mr250shot on October 14, 2009 at 4:00pm

by tha way are those patriot heads open or close chambers.

Comment by mr250shot on October 14, 2009 at 3:35pm

thanks kingmankid for ur input on my build. i think im gona go with tha 454 instead of making it into a496. i guess inches dont always make horsepower.it a 454 thats bored .60over. il sit back and waitt on jack to post tha result of ur combonation with his engine analyzer plus.

Comment by Aaron thomas on October 14, 2009 at 1:08pm

hey i have a problem with my 88 s10 the oil light is on when it idle's but when i
put it in 1st gear and start driving the oil light goes off .

Comment by Kingman Kid on October 14, 2009 at 11:49am

Go for it Jack,
Post the results when you are done...I am interested.

Thanks
Kingman Kid

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