Phil Jacques

I am building my engine based off of an LQ4. It's for a project that I am still honestly in search of a chassis for, but since the engine was available to me I decided to go for it now.

There is no rhyme or reason for the car, just something to enjoy on the street and at the track (road and strip).

- LQ4 Shortblock (67k miles)
- Patriot CNC Ported LS6 227cc Heads with 2.055" intake and 1.57" exhaust valves and 59cc combustion chamber
- EPS 234/246 Camshaft
- FAST LSX-R Intake
- Harland Sharp Roller Rockers
- Comp Hydraulic Roller Lifters
- TSP Pushrods (once length is determined)
- Rollermaster Double Roller Timing Chain (adjustable)
- LS6 Ported Oil Pump

I dont really care about the power numbers, I just want to know if anyone has any suggestions or sees something that won't work right. Also, would be interested in knowing if fly-cutting the pistons will be necessary with the heads since they are milled to achieve the 59cc combustion chamber.

Thanks Guys!!!

Phil

Marcello7x

iTrader: (10)

Cam lift specs are needed to determine if you need flycutting. I wouldnt know but that info would help someone else give you the info.

tremiles

With those duration numbers and milled heads, it's likely that the pistons will need flycutting.

Phil Jacques

Sorry bout that... here's the cam specs.

Product Information
Intake Duration: 234 Degrees at .050" Tappet Lift
Intake Lift: .602" with 1.7 rockers
Exhaust Duration 246 Degrees at .050" Tappet Lift
Exhaust Lift .607" with 1.7 rockers
111 Degree LSA

-Q-

iTrader: (10)

My LQ4 cam (specs in sig) cleared with about the minimum clearance you would want, and my combustion chamber cc is 62. I would really doubt if your cam is going to clear with 59cc heads.

Phil Jacques

then fly cutting it is! haha! If I can find one here shortly, this will end up in a notch fox with a T56 behind it. Should make for a FAST and FUN car.

garygnu

get some yella terra if you have not bought rockers yet.

SOMbitch

iTrader: (8)

I usually agree with you Gary but IMO with those heads stockers should be fine. Maybe do the trunnion upgrade to them though...

Phil Jacques

I was going to go with Harland Sharp 1.7RR's I ran Harlands issue free for a number of years in my 331 stroker stang. They did me very well.

Phil Jacques

what would you guys use for head gaskets? Felpro? The car will never see a bottle or boost so I don't think I have to stress too hard on excessive cyl pressures, but I wasn't 100% sure what I should use.

Also, 42lb injectors? bigger? smaller? Any and all opinions very welcome!

Marcello7x

iTrader: (10)

Personally i went with cometic mls gaskets. If you trying to squeez out as much compression with a thinner gasket thats your best bet i think. Otherwise stockers are a great price and strong.

99Bluz28

iTrader: (35)

GM MLS head gasket there almost fool proof !

Marcello7x

iTrader: (10)

and you can get like 3 pairs at the cost of cometics!

Phil Jacques

I am very weary of cometic's for one reason.

I built a Nissan 1.8L Turbo (CA18DET) a few years back for one of my old imports, and everything went perfect. Put a cometic head gasket on and filled it with oil, from first start, that sob leaked. Took the head back off, checked to make sure nothing accidentially fell in place while bolting the head down, tqd it down again... leaked still.. Always between cyl 3 and 4. Took everything back to the machine shop after disassembling the engine, had the machinist check it all, and it was all right. Had a local engine builder, Justin Lauffer of Lauffer Racing Engines (has worked with the likes of Tim Lynch) Assemble everything once more with another brand new cometic, Took the engine home and installed it... IT STILL LEAKED...

So you can see my position there... We never found out what caused it to leak... I ended up throwing a Felpro on, pushing 25psi and was on my merry way with no issues... but Cometic has left a bad taste in my mouth ever since.

Marcello7x

iTrader: (10)

were they mls? cometics seem to have a pretty good rep in the ls world from what i've seen.

Phil Jacques

yeah, MLS... blew my mind... Cometic was all that was available other than OEM and Felpro for this particular engine and it just leaked... And the oddest part to me was, it was on an oil drain, not a pressure source... I'll give it a try... I may just spring the extra few bux for MLS.

In reality, I expect this engine to make north of 450whp N/A. I don't think head gaskets will be a MAJOR concern since it won't see a bottle or boost as I mentioned, but I want to make sure I have something GOOD in there.

garygnu

do the patriot heads have bronze guides?the stock rockers could work if your valve train geometry right on.get comp trunnion bearings ,measure for correct length push rods .

Phil Jacques

https://www.patriot-performance.com/...&cat=37&page=1

That's the link to the heads, "Valve Guide Material: Manganese Bronze" is what is listed on their site. I will look into it.

Marcello7x

iTrader: (10)

Do you already have the heads? I think you would make more power with a smaller intake chamber size. Search for q thread from pat g about going with a smaller head for more velocity and power."recipiet to 500rwhp" or something similar.

My motor is for a dd with alot of hw cruising and my cam was spec'ed by pat to only a little bigger than yours, and mines a stroker. Should he very street friendly and romp.

Phil Jacques

Marcello, I have not bought anything yet. This is the EXACT reason I made this thread. Maybe it can help others a bit too one day =) I am reading PatG's thread right now... I will report back in a bit!