[greaseball]

I decided to make this post in an attempt to correct some bad information that was floating around on the internet for the specs on the Gen V LT5 camshaft.

When the Gen V LT5 engine first came out, it’s cam was being touted as an excellent (and cheap!) candidate to swap into a Gen V L86/L87 and LT1 engine for a DOD delete cam. Original information showed the LT5 cam specs to be the same for the L86/L87 and LT1 camshafts but without the DOD cam lobes.

Well, it seems that the original information was incorrect. The LT5 actually has different intake and exhaust durations, lifts, and LSA (and probably other differences, such as the fuel lobe). For instance, L86/L87/LT1: 200/207 duration at 0.050) with 116 LSA. LT5 cam: 189/223 duration with 120 LSA. Intake and exhaust lifts for the L86/L87 and LT1 engines .551/.524; the LT5 camshaft is .492 intake, .551 exhaust. These correct LT5 cam specs indicate that this cam is set up for a blower application (Gen V LT4 and LT5) and NOT set up for a normally aspirated application (GenV L86/L87 and LT1).

Unfortunately, I followed the early information on the LT5 camshaft and swapped it into my L87 long block as part of a DOD delete. The engine is now complete but hasn’t been fired yet due to delays in my project. So now what do I do? Leave the cam in there and hope that there isn’t a noticeable penalty in engine performance? Or, pull the LT5 cam out now before the project is complete (front sheet metal is still off the car) and swap in a different cam? I’ve searched the internet and haven’t found any results from someone that used an LT5 camshaft in an L86/L87 or LT1 and reported the resulting dyno numbers after the swap.

I hate getting bad information from the internet!

[Tim john]

Perhaps also ask this question on the Lateral G forum. Plenty of folks on there with vast modern engine knowledge.

I too have an LT5 sitting on the stand for a future project.

Tim john---

[Scarebird]

I have noted that this cam would be the equivalent of a Thumpr for Gen V's...

[greaseball]

Originally Posted by Tim john

Perhaps also ask this question on the Lateral G forum. Plenty of folks on there with vast modern engine knowledge.

I too have an LT5 sitting on the stand for a future project.

Tim john---

Thank you for that suggestion. I was also thinking of posting this on the LS1Tech site and/or the Camaro 6 site

[greaseball]

Originally Posted by greaseball

Thank you for that suggestion. I was also thinking of posting this on the LS1Tech site and/or the Camaro 6 site

Scarebird beat me to it:

https://ls1tech.com/forums/generatio...cam-error.html