forged or hyper

[POPO1984]

guys im building a 383. my engine guy seems like he wants me to use forged pistons. the ones he wants will put me around 9.5:1 cr and are 450 bucks. do i really need forged or could i go hyper. i dont plan on spraying it or FI

[swb85]

If no power adders are planned, hyper is just fine. In all reality, you can even put a light power adder (100 shot or ~5lbs of boost) to quality hyper pistons so long as the tune is in order.

[ProStreet68SB]

Originally Posted by swb85

If no power adders are planned, hyper is just fine. In all reality, you can even put a light power adder (100 shot or ~5lbs of boost) to quality hyper pistons so long as the tune is in order.

hypers can handle boost, just not spray. Remember the old GMC syclones and typhoons? I wanna say it was 11 or 13lbs from the factory on hypereutectic pistons. I know a guy here in cbus is a 5.0 mustang running hypers and 10lbs i wanna say he makes 435whp. So hypers can take boost, just not spray.

[hotrod 80]

Forged or cast for me .

[swb85]

Originally Posted by ProStreet68SB

hypers can handle boost, just not spray.

Tell that to all the ls1 cars that have a 150+ shot on them. Shoot there's some local guys around here that have been spraying 200 for several years on stock bottom ends.....they won't last forever, but if you keep it from detonating it won't grenade.

[Ticker]

Originally Posted by swb85

Tell that to all the ls1 cars that have a 150+ shot on them. Shoot there's some local guys around here that have been spraying 200 for several years on stock bottom ends.....they won't last forever, but if you keep it from detonating it won't grenade.

I have seen hypereutectics hold up under some brutal abuse...but in the end it becomes a risk management process

[Ticker]

The one thing to keep in mind that it's relatively cheap now to go forged...but hella expensive later (new pistons, rebalance, etc.)

If you think in your wildest dreams that you might user a power-adder later...spend the $$ now.

[rjs53]

It wouldn't bother me to go hyper if no power adders. I had a ZZ4 that i angled milled the heads .020 put the comp hr282 cam in and 1.6 rockers drove it like i stole it and had close to 200 1/4 mile passes on it. always ran 91 or 110 in it the one time i put 87 in it it rattled but didn't hurt it. wish i still had that motor but that's how wheelin and dealin goes

[Alex1]

Forged.

[Marv D]

No way would I build ANY performance or even a towing engine with hypereutectic pistons. Add a little detonation and they turn back to the sand whence they came. I have opened up more than one broken motor and found a hypereutectic piston GONE, no evidence at all it ever existed. Well,, except the big gaping hole in the cylinder wall where the rod beat the crap out of it with no piston to guide it's path.
Hypers are great for a driver / cruiser. Little thermal expansion means they have a tighter bore cold, are quiet as cast, great oil control, no scuffing if the motor overheats. They have their good points. but they also have their down side.

[Ticker]

I've built a bunch of hypereutectic engines - some that were pretty warm - and the only time I've seen 'em break is when more than a 75-100 shot of NOS is used, or when using Keith Black pistons without paying proper attention to ring gap.

NO engine is going to survive sustained detonation at speed...

[POPO1984]

Okay I got the forged srp 18cc dished pistons for $ 450.00 out the door. I plan on running 72 cf heads which should put me around 9.1:1. This is with a 6.0 rod. At least this is what my engine guy is telling me.

[Ticker]

Originally Posted by POPO1984

Okay I got the forged srp 18cc dished pistons for $ 450.00 out the door. I plan on running 72 cf heads which should put me around 9.1:1. This is with a 6.0 rod. At least this is what my engine guy is telling me.

Tough decision - but a good one. I personally like SRP and buy their pro kits for my builds almost exclusively.

I'm sure the engine guy has "done the math" and done it right...but ask him to lay the whole thing out for you - deck height, head gaset, quench, etc. You'll want that stuff later for sure. Generally you want to collect EVERYTHING you can and put it in a "build book", which is the "bible" (<- not capitalized, so everyone relax ) for your engine. P/N, clearances, etc...get it all.

[BossHogg69]

Good call on the SRP's - I have a set of forged 23cc dome forged SRP's in my 468.

[Hertzdaddy]

Originally Posted by Ticker

I'm sure the engine guy has "done the math" and done it right...but ask him to lay the whole thing out for you - deck height, head gaset, quench, etc. You'll want that stuff later for sure. Generally you want to collect EVERYTHING you can and put it in a "build book", which is the "bible" (<- not capitalized, so everyone relax ) for your engine. P/N, clearances, etc...get it all.

Very good advice. I wish I had that info now on an engine I bought already assembled.

[fiddy9apache]

forged, spend the extra money now.

[djracer]

You made the right decision so now order that plate system to get that pig out of the hole! LOL

[POPO1984]

Originally Posted by djracer

You made the right decision so now order that plate system to get that pig out of the hole! LOL

That was one of the reasons that I got the forged. If I want to spray it way later down the road ill be able to.

[J_PEPIN87]

Who's building your engine popo?

[hotrod 80]

Originally Posted by j_pepin87

who's building your engine popo?

x 2

[POPO1984]

This older guy in South Houston his buisness is called speeco. Ive heard really good things about him. Really nice guy he is also doing my rebuild on the differential. His name is Harold or Buddy

[djracer]

If my memory serves me right someone on here had a 305 with a bunch of spray and I think it had cast or hypers in it but I wouldn't try it. I always say I would rather be lucky than good. That guy was lucky.

[scatesracing]

Originally Posted by djracer

If my memory serves me right someone on here had a 305 with a bunch of spray and I think it had cast or hypers in it but I wouldn't try it. I always say I would rather be lucky than good. That guy was lucky.

I have hypereutectics in mine... I have been spraying it with 200 for some time... Im not saying its a good thing. i will put forged in my next bullet. someone said "spot on set up" thats the key i dont see them being very forgiving when she goes lean or preignites. forged is the right choice

[Shon]

local 135k mile STOCK Bottom end LT1 is running in the 9s (1/4 mile) on the hose so if you got the tune right, it will work....

[hotrod 80]

Originally Posted by Ticker

I have seen hypereutectics hold up under some brutal abuse...but in the end it becomes a risk management process

Originally Posted by Shon

local 135k mile STOCK Bottom end LT1 is running in the 9s (1/4 mile) on the hose so if you got the tune right, it will work....

If these are the Mahle pistons they will take quit a bit of abuse if the tune is right , but The popular name brand that first comes to mind you couldn't give me .