Failed OEM lifter & cam, help me pick a replacement
02-19-2018, 06:26 PM
#1
Failed OEM lifter & cam, help me pick a replacement
This is in follow-up to a previous thread I started on a ticking noise: https://www.corvetteforum.com/forums...head-swap.html
I pulled the heads over the weekend and as feared the root cause may be a failed lifter and cam lobe - the cam will be coming out as well due to roughness on one of the lobes. It's mild damage, but enough that I wasn't comfortable just dropping the new lifters in. Engine is stock (59k) and untouched except for AHP Stage 4 heads I installed last summer. I'll update with pics once I have the cam out in a few days.
This is a mostly-daily driver that just sees some auto-x duty. Looking for something on the tamer side, I have been in a BTR Stage 3 car and I consider that too much cam. Ideally would like >500 whp with just the cam - my AHP's are not milled or ported and I'm running F2042p exhaust valves.
Leading choices are:
- TSP Stage 1.2: 228/240 .635/.635" 114
- Cam Motion Stage 2: 228/240 .630/.612" 118
- Katech 116 (or AHP's CA116): 220/244 .615/.648" 116
Both TSP and Cam Motion suggest using their .660 duals with Ti retainers with their cams. However, for valvetrain stability reasons I'm considering PSI 1511s or 1515s which seem suitable for any of the above cams although I'm leaning towards the 1511s as the 1515 seems suited for higher lift applications. Have yet to get Kohle on the phone but he also seems to prefer the PSI springs. Just looking for input from anyone familiar with these cam/spring options (or something comparable) to help me make a decision on a combo.
I pulled the heads over the weekend and as feared the root cause may be a failed lifter and cam lobe - the cam will be coming out as well due to roughness on one of the lobes. It's mild damage, but enough that I wasn't comfortable just dropping the new lifters in. Engine is stock (59k) and untouched except for AHP Stage 4 heads I installed last summer. I'll update with pics once I have the cam out in a few days.
This is a mostly-daily driver that just sees some auto-x duty. Looking for something on the tamer side, I have been in a BTR Stage 3 car and I consider that too much cam. Ideally would like >500 whp with just the cam - my AHP's are not milled or ported and I'm running F2042p exhaust valves.
Leading choices are:
- TSP Stage 1.2: 228/240 .635/.635" 114
- Cam Motion Stage 2: 228/240 .630/.612" 118
- Katech 116 (or AHP's CA116): 220/244 .615/.648" 116
Both TSP and Cam Motion suggest using their .660 duals with Ti retainers with their cams. However, for valvetrain stability reasons I'm considering PSI 1511s or 1515s which seem suitable for any of the above cams although I'm leaning towards the 1511s as the 1515 seems suited for higher lift applications. Have yet to get Kohle on the phone but he also seems to prefer the PSI springs. Just looking for input from anyone familiar with these cam/spring options (or something comparable) to help me make a decision on a combo.
02-19-2018, 06:32 PM
#2
Team Owner
All of those will achieve your goals IMO.
02-19-2018, 10:10 PM
#4
Le Mans Master
I am not a cam person at all...these numbers dont make any sense to me, but with that being said, the person that built my car told me he was going to put in a Torquer 116. When I picked the car up, he told me had put in a custom grind instead. Specs supposedly are: .227/.239, .640/.645 114 LSA. I've been told its a bably LS7 cam. I dont care, I like it. Makes good power throughout, easy to drive, and has a good lope at idle. Car made 524.07 rwhp on 91 oct.