American Speed vs LS

American Speed vs LS

Author
Discussion

740EVTORQUES

Original Poster:

980 posts

7 months

Sunday 23rd June
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Newbie question, how do these compare in terms of usability, reliability etc? No worries about ultimate power as they’re all fast enough but don’t want to skimp on the purchase price and end up with a lot more headaches!

Thank you.

TR3B

174 posts

58 months

Sunday 23rd June
quotequote all
My crate LT has been stellar, I picked it up at the Chevy dealer down the street (so delivery was easy) and for the first year the engine and ancillaries were covered by the factory warranty. I had a belt tensioner break during install and they covered the replacement without any hassle. Don't know what part of the world you're in but if you live near a GM dealership these things might be a plus.

Panamax

4,812 posts

40 months

Sunday 23rd June
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I'd keep things as simple as possible, which means a standard Chevy engine. Any of them should get an Ultima moving along nicely and with good reliability.

740EVTORQUES

Original Poster:

980 posts

7 months

Sunday 23rd June
quotequote all
So stay clear of American Speed is the general advice?

Thank you

UltimaCH

3,160 posts

195 months

Thursday 27th June
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In the past the Factory recommended builders to use American Speed, but don't know what their position is today though

740EVTORQUES

Original Poster:

980 posts

7 months

Thursday 27th June
quotequote all
UltimaCH said:
In the past the Factory recommended builders to use American Speed, but don't know what their position is today though
The reason I ask is that I've found a nearly new GTR with an American Speed engine. I'm not chasing Ultima(the) power or performance, I'm sure they're all good enough, but just want that Ultima experience without too many headaches.

I'm more than happy to do the odd bit of carb balancing if that's what's required though.

845ste

578 posts

133 months

Sunday 30th June
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I remember that here in PH, in the past, many owners had problems with HP that American Speed ​​declared on paper: on dyno they never corresponded..... and the differences were notable -10/15%

confusionhunter

449 posts

228 months

Sunday 30th June
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I wouldnt stay clear per say, I think the issue as said already the power numbers werer alittle inflated, but Most Ultimas pre LS will have American speed engines, and actually they are just a builders, the SBC platform has been around far longer than the lS platform and is still one of the most tunable bang for buck engines available IMHO. You'll pay a lot more for an LS engine. I for one enjoyed my Carbed SBC until I upgraded to Efi. The engine itself has been rock solid, had a few issues with ancilleries. But I kno of a low mileage LS thats snapped a valve spring, so each engine will have its foibles, Id wory more how its been looked after. smile