OK, have a question, here's my setup:

347
TEA Stage 1.5's milled, .030? (58cc chamber)
.40 Cometic gaskets
Mahle Pistons, -9cc dish with valve reliefs
Cam, 232/236, .579 lift, 114 LSA on a renegade lobe
Stock rockers
Comp R lifters
7.350" P-rods

I understand that it's never a bad idea to check P to V but do you think it's necessary? I don't have a pair of solid lifters or soft springs. I suppose I could get them but if it's a "sure thing" that I'll clear, I would rather not waste the time.

Also, as far as setting preload with these lifters, I've seen differing methods posted. My thoughts were to torque to 22 Ft/lbs, turn the engine over, using a straight edge...scribe the P-rod on the base circle, release torque, make second scribe and measure the distance between the two. If ~.030, call it a day. Is this "right" with the Comp-R's? Are the stock rockers OK with these lifters, I have since read that these are no good with the stock non-adjustable rockers. This motor has not been fired yet, it's being built on the stand. I would rather only do it once. Thanks for the feedback.

Ryan
P.S. Anybody using this cam?

 

I would think that P to V would be just fine with that setup. Of course it never hurts to check things first, but I don't think you have anything at all to worry about.

Don't know about the preload question tho.. sorry

 

With that much milled and the thin gaskets, I would measure the clearance and not trust the guesses you will be getting. You might be ok with those pistons, I don't know. Also, you will need adjustable rockers. What are you going to do if .030 doesn't show up for your preload? Also, have you tried laying a straight edge on a head and get it anywhere's near the pushrod? It doesn't come close. I think that process was meant for older heads.

 

You'll have no problem you already have Valve Reliefs. Why the - 9 CC dish? are you going forced induction?

 

Yeah why are the heads milled .030 and you have dished pistons? Thats backwards of what is optimum. You just shrunk your effective chamber flow path to gain compression, which you took away with the pistons. As far as PTVC goes, I wouldnt even worry about it. Assuming you know the cam grind is right and the install is spot on.

Brandon

 

Yeah, the original plan was to go forced induction when the shortblock was in the planning stage. I used Mahle -9cc forged pistons, Callies rods and a hardened stock crank. My original intent was to go with a pair of 225 AFR's (72cc chamber). Well, plans changed (another FI car got dropped in my lap) so I had to make a decision. Being that the car receiving this LS1 is 2700 LBS, FI isn't exactly a *necessity*, lol.

So I gave Brent @ TEA a call and opted for the 5.3's with a 58cc chamber. Assuming our math is right, with .040 gaskets, I should be ~10.7:1. Not exactly optimal, I know, but it does leave the door open for FI in the future.

I put the Comp "R" lifters up for sale in the parts section. More PPP on my part . It seems like for me, it will be more trouble than it's worth. On that note, if someone has a new set of 850-16, Comp OEM lifters, I'll trade ya straight up. I'd like to stick with my stock rockers to minimize headaches. That and I already purchased a set of 7.350 pushrods.

Thanks and keep the feedback coming!

Ryan