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· 74 XB Fairmont
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5,129 Posts
My last engine used ACL race series pistons. My opinions on them isn't very good. The skirts collapsed causing what you'd call piston slap. My old engines bores showed some real ugly marks.

They lasted 25,000k's and I noted signs (smoke out the tailpipes) by 30,000k's they were gone. That engine spent most if it's life around 3000-4000rpm. Only went higher when I raced it. Cruise rpm for me (100kph) was 3350rpm.
 

· Prostreet Wagon
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55 Posts
I used them in the first 302 that i built some 9 years ago as brenx said they only lasted 20-30,000 klm's and the motor only reved to 6000 rpm when raced and around 2500-3500 rpm daily driving. It all depends what your buget is and your going to do, do you want to rebuild in 30,000klms or not?
If money isn't a prob then go something better.
Mick
 

· Slurry Boostin
Joined
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1,247 Posts
Have built one clevo with the ACL Race series, 351 with 302 rods.

Very nice. But admitedly, the engine has probably only done around 2,000kms as not long after it was built the owner end up in a wheel chair.

Fear not, he will be back in action with the XD this year, but with CHI's, nitrous and a nasty auto/diff combo :driver:

Few here reckon the aren't much chop so take some advice from these people. They've used them. Only thing is that some may have been harder on their gear than is led to believe. :shh:
 

· XBGT Hardtop
Joined
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15 Posts
CJR09 said:
So what would you guys recommend instead of the acl race series to suit 302 rod then? Or would you recommend not using 351 crank/302 rod/short skirt piston all together?
SpeedPro make a piston but i cant find a part No or speedpro's website, as i wouldn't mind a set either, ACL's are priced at $774
 

· Registered
Joined
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272 Posts
If youre after the most longevity with the ability to give it a beating and not have to fear the consequences go for a quality forged piston, it may be a few hundred more upfront but the lifespan should be much better, and you have the peace of mind.

Having said that I've never run a forged piston engine yet and had good life from a std 302 piston set even with a greater than spec piston to bore clearance(it had been honed 3 times), but thats with a 302, the 351 is going to put more load onto the piston, in the end it ovalised no 1 bore, but that was 40 over with 3 hones on top of that, was a bit knocky.
 
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