automotivebreath

Most Q16 events are bracket races, you need to have enough power to qualify
in the field, then it's all about reaction times and consistency.

mdacton

Well, this is new to me also.....I thought it was heads up pro tree.

I guess that changes things somewhat......as long as you make the field.

rskrause

Yes, you just need to qualify. 7.50 should do it almost anywhere. Many events use a 0.3 second breakout rule, so it isn't strictly like typical brackets.

Rich

SStrokerAce

I don't agree! A LS7 head is so far beyond ANY 26°-18° BBC head that pound for pound a LS motor, especially with LS7 heads will walk all over a BBC. In terms of cost, you can build decent LS motors for the same price as decent BBC's and have a lighter package that can make more HP per the same cube or more HP per cube, take your pick.

Bret

rskrause

The novelty of the LSX also appeals to me, a lot.

Rich

mdacton

One thing I didn't think about with the LS vs. BBC is the wt.

Big motors are pretty heavy!

What is the weight defference? I'm sure just the dead wt. equates to free up some h.p. so thats a pretty big plus

SStrokerAce

Rich, cost effiectively a Iron LS can handle some serious grunt with a 6.0L iron block. They are not light like 230lbs or something crazy, but they are around $350 or so compared to the $1800 LSX block. (even then total engine weight would be 490lbs)

I was planing to one day run a centrifigal blower 365 cube iron block motor in my 64 GTO, but I'm thinking it might make a better cruiser, or CP AutoX car! My plan was put billet caps on the 6.0L iron block sitting here with a aftermarket head like a Dart. That's easy for 408 cubes if need be and should handle 7500rpm without a fuss.

I still like the 383 LT1 idea ;-) lol

Bret

automotivebreath

Bret,
I agree the LS engine in an engineering marvel compared to the antique BBC.
The combustion chamber layout alone is enough to justify the decision. The
pluses are many, great main cap configuration, good port design, availability
of good cheap blocks, a light compact package, a wide selection of heads and
compatibility with common transmissions to mention a few.

Rich,
Can you explain the 0.3 breakout, does this give advantage to the faster car?

MachinistOne

I have a 6.0L block that has been sitting in the shop for a couple years now, just don't want to put it in something because the weight is insane - I prefer to go fast in the twisties, rather than just a straight line.

SStrokerAce

You ever put one on the scale? I've been wanting too just to see how bad they are but it really takes 3 big guys to safely move one into a vehicle!

Bret

rskrause

Anyone have a PN for that iron LS block? I may just pick one up at that price to get a good look at it.

Rich

MachinistOne

From mortec:

12573581...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck
12577184...364...98-04...crossbolted cast iron, Gen.III, 6.0L, truck
12551364...364...98-04...crossbolted cast iron Gen. III, 6.0L, truck

I don't have a scale that goes high enough to weigh one, It's a shock when you try an move one though - it doesn't look as heavy as it is. I pick up and move gen I's solo, no way am I trying that with one of those.

rskrause

Thanks!

Rich

SStrokerAce

Rich,

I have one at the shop if you need one or I can take pics of it for you.

Bret

thesoundandthefury

It's funny how the wind is blowing in the direction of a 6.0 LSx truck block engine.

When a very similar topic came up two years ago:

http://web.camaross.com/forums/showt...II+differences

Lo and behold, the very last post in that thread:

http://web.camaross.com/forums/showp...8&postcount=62