Building a tough 350

[6000SUX]

What you want is a SBF with some inches.

I'm pretty sure Damo wants a Camaro, so using a Chev engine would probably be more straight forward and more kosher?

[ChrisS]

http://australianspeedway.com/showthread.php?t=41382

bargain of the century, use the heads, rods and cam off that on 350 4 bolt bottom with suitable pistons and you should get an easy 600+hp on pump

Fkn oath!!

[Dave]

177 + suitable e85 carb = time to rip skids and mac bitches

[9triton]

177 + suitable e85 carb = time to rip skids and mac bitches

whilst sipping on a machiato

[Coffin]

Ok started looking into things a little more, and slowly getting my head around pistons, cams, pushrods etc.

Couple of questions (bearing in mind that it appears to be going down the direction of maybe a 383 stroker with a 6/71)

Will be going a forged bottom end, but whats the difference/benefits between I beam and H beam rods?

If it goes a stroker, there seems to be a few different rod/stroke length combo's? ... is there an "ideal" combo?

Also with heads, I've been told good intake runners, but to look for heads with big exhaust ports/runners as possible? ... this correct for a SC setup?

[chartreusehj]

Watch this get me in trouble, but a good I beam rod is better than a H beam rod for the following reasons.

Lighter
less clearancing of block
more clearance to cam

Probably a bunch more that escape me ATM but there are two caveats to the above

1. GOOD I beam rods are much more expensive than a H beam, youd be looking at oliver/lunati/manley etc.

A half decent H beam is probably half the price.

2. blown engines are a different animal, and since you dont need rpm to make the power the weight penalty of the H beam sometimes dont matter.

Each style of rod is stronger in different planes, cant remember which is what but it relates to reciprocating loads versus tension/compression.

One design is more better for RPM, the other betterer for compression/tension.

That bloke with the torn up hand or some of the smarterers here can tell you what you need, Id be happy with a decent H beam purely for cost reasons (in fact thats what im using)

rod length/piston compression height is more important on an NA build, same reasons as rod style (weight, cam clearance with big stroke etc), since its a blown motor Id want the right piston and let rod length fall where it lands.

The right piston will have a thick crown, ring placement not too close to the deck, and so forth.

I am using a 383/5.7" srp piston in my turbo shitter, its a "boost" piston and quite reasonably priced, be careful about choosing a dished piston because everything i looked at to get the right dish was aimed at low comp NA stuff and real thin in the crown.

I wouldnt want anything under 0.200" crown thickness, i cant remember what my 31cc dish srps had, but it was plenty more than that.

I probably wouldnt want a 6" rod 383 on a blown motor, stick with 5.7" and enjoy far greater choice of pistons. (1.425" CH if youre googling)

[Bermo]

H beams and stronger than I beams.

Dont know much about the S/C side of things though...

[chartreusehj]

H beams and stronger than I beams.

Dont know much about the S/C side of things though...

thats only because they are physically larger, weight for weight I wouldnt be so sure about that.

The fact theyre beefier leads me to believe they need the extra material to get the strength.

[Coffin]

Watch this get me in trouble, but a good I beam rod is better than a H beam rod for the following reasons.

Lighter
less clearancing of block
more clearance to cam

Probably a bunch more that escape me ATM but there are two caveats to the above

1. GOOD I beam rods are much more expensive than a H beam, youd be looking at oliver/lunati/manley etc.

A half decent H beam is probably half the price.

2. blown engines are a different animal, and since you dont need rpm to make the power the weight penalty of the H beam sometimes dont matter.

Each style of rod is stronger in different planes, cant remember which is what but it relates to reciprocating loads versus tension/compression.

One design is more better for RPM, the other betterer for compression/tension.

That bloke with the torn up hand or some of the smarterers here can tell you what you need, Id be happy with a decent H beam purely for cost reasons (in fact thats what im using)

rod length/piston compression height is more important on an NA build, same reasons as rod style (weight, cam clearance with big stroke etc), since its a blown motor Id want the right piston and let rod length fall where it lands.

The right piston will have a thick crown, ring placement not too close to the deck, and so forth.

I am using a 383/5.7" srp piston in my turbo shitter, its a "boost" piston and quite reasonably priced, be careful about choosing a dished piston because everything i looked at to get the right dish was aimed at low comp NA stuff and real thin in the crown.

I wouldnt want anything under 0.200" crown thickness, i cant remember what my 31cc dish srps had, but it was plenty more than that.

I probably wouldnt want a 6" rod 383 on a blown motor, stick with 5.7" and enjoy far greater choice of pistons. (1.425" CH if youre googling)

Cheers, exactly the kind of info im looking for, thanks

[Coffin]

on a blown application, would there be much difference with 180cc intake heads and say 210+

GreenHJ got a link to your pistons?

[chartreusehj]

The second link is what i ended up with, though measuring them up they were very slightly "undersize" which wont matter on a fresh bore/hone job, but gets a little ordinary on something with 2 hones under its belt already and a third to suit lol.

Obviously youll find a piston that suits the oversize youll end up at, depending on chamber size you may not even need 31cc but my heads were shaved a bit so the only way to pull comp was with the piston or a stupid thick gasket.

My machining guy really like JE and Diamond pistons but they start getting spendy for budget builds.

Heaps of people using srp's for reasonable engines on a budget.

srp piston listing

31cc dished srp

[Coffin]

Thanks for that.

ALready have a fresh honed 4.030, no heads yet, but im glad to see that there are some decent dished pistons if I need to.

Still trying to get my head around/find advice on heads which are suited/better suited to a blower yet

[BeverlyHillsCop]

http://www.proformance.com.au/NASCAR...E-FOR-SALE.htm

Do it.

[TK]

Damo, just give me a call some time mob nu is 0411 015 157.

Coz of my hand it's a PITA to type out a long post, but in brief what you probably want is a nice 383 with cast crank, good I-beams & SRP slugs, AFR 210 heads, basic roller rockers & hyd roller cam, weiand 177 underbonnet blower & an 850 E85 carb.
If it don't make 600hp under 6000rpm, idle like a mild NA engine & get decent economy (for a blown V8) then something is wrong.

I deal with the guys that bring in the weiand blower kits, AFR heads etc & I deal direct to the states for a lot of the internals.

Will be quite a lot more expensive than a crate engine with a blower, but will be built right & won't go bang or need to be pulled down after 12 months.

An SHP block would be great, but with the rego guys going all nazi on aftermarket blocks you may well be stuck with an old block if you want to legally register it.

Great thing about a blower is it's easy to unbolt & throw an regular intake on for rego time & the 177 will go under the bonnet of a camaro with just a small cowl scoop for the air cleaner, so not a cop magnet.

[Coffin]

Will do TK