954RR

iTrader: (1)

Ok I have bought an LS1 short block with a 224/224 563.565 112lsa cam in it. I am going to be putting 5.3 truck heads with 918 springs on them onto the motor and having them milled down .30 or so just enough to get and 11-1 comp. Also having bigger valves put in. but..... this is going into a 5300 lb truck with a 2600 yank stall and 4.10 gears. It is also 4wd.

Any recomendations on diff cam or is this cam good? what about head work am i headed in the right direction? Will be using the truck intake manifold with a upd intake and asm headers. Also using 32lb injectors. Motor will be ls1editied and with a-tap and a wideband so tune will be right on.

What kind of #'s should I see
Thanks a bunch in advance!

Brian Tooley Racing

iTrader: (13)

If your going to a 5.7 engine then make sure you deshroud the intake and exhaust valves to the 3.90 bore, or the heads won't flow very well, we CNC these chambers for $100.

954RR

iTrader: (1)

I will call you about this Brain never heard of deshrouding.

Any other suggestions?

98SS Blackattack

Hey Brian, if those heads flowed 225 cfm before your CNC,what will they flow afterwards? CFM wise, Just a ballpark figure will do. Thanks Tony

954RR

iTrader: (1)

So in just guessing but do I need to have this done? I want to get some serious power out of this combo and I know the truck intake is holding me back. Would a different cam... like say a 226/236 58x work well? Want something that lopes good and will match up with my stall nice.

I know some of you LS1 guys have some experience with this.... this is the internals section

Will have longtubs and UPD on too but will not spray it ever I hope...
Thanks for any replies

Brian Tooley Racing

iTrader: (13)

If you are putting a 3.800 bore 4.8/5.3 head on a 3.900 bore 5.7 engine then the heads will not flow as well as a factory 5.7 until the chambers are opened up to the 3.90 bore. I don't know exactly how much flow you would get just doing the chambers, maybe 20 cfm. If you do the full CNC port, valve job for a 2.02 valve and hand blending then they flow 300-310. The chamber is still 63cc after it has been CNC'd out to the 3.90 bore.

954RR

iTrader: (1)

Ok am I going to have any clearance problems if I have you take the heads down .30 or whatever it takes to get and 11-1 comp ratio. Also if I add the 226-236 cam would I run into clearance probs? How much to get the heads flowing as good as ls1's? Also what in terms of dollar per hp am I looking at. I would like it done right to get top hp for my application.

I called your shop today to get my heads down there but the guy I spoke to said it would be 3 weeks before he could touch them.... that is a little long but let me know.
THanks

Brian Tooley Racing

iTrader: (13)

I would do one of two things, either just put them on the way they are, or do the works to them so you don't have to do it again. I have sold heads to guys that are on their second, third or even forth set of heads. They are always mad that they just didn't get it done right the first time. We have 5.3 heads here already CNC'd, I could swap these out for yours, would only take a few days. You do have a 5.7 going in that thing right? I can give you milling advice also, Thanks

954RR

iTrader: (1)

Ya I am going to be putting a 99 ls1 with a 224 cam in my truck. I just want it to flow as well as it can. Motor has 18000 miles on it.

How much to just swap out my 5.3 heads with 918 springs that have a little over 30K on them for some of yours? Would like to have a 11-1 comp ratio as well.
Thanks