kazfan30

iTrader: (18)

What are some of the largest cams are you guys clearing with.....2.02/1.57 valved heads......no milling or milled...thanks

PREDATOR-Z

TSP 232/234 113+0 will fit
FM 13 should fit
G5X1 should fit
FM14 will fit on a 113+0

(unless it is Ferrea Valves)

Xtnct00WS6

iTrader: (8)

Well I have the 243's from Patriot so I'll chime in. Specs:

milled .010
.045 gasket
Ferrea 2.02 and 1.57
Thunder Racing 224/224 on 114 with 4* of advance

I remeasured my intake clearance the other day and came to .080 (about 1000 miles after head install) on the closest cylinder on the driver side while the opposite one a few weeks prior got me .130 (right after head install). I'm not sure why it varied so much. I had a bit of room to breathe on the exhaust side. I want to say that clearance came to be about .130. I'm not 100% sure on that though. With my setup, I don't think I'd feel comfortable with anymore than a 224/228 duration cam based on my measurements. With some aftermarket valves you have to be careful of the margin also. This was my pitvall. I didn't realize some of them were much more than stock, thus giving up a good deal of PTV clearance. Here's a pic of what I'm talking about.


stock on the right and ferrea on the left.

TWISTEDTA

well, i went with the F11 to play it safe

kazfan30

iTrader: (18)

That is exactly what i wanted to hear....im almost 99.99% sure im goin with an F11 cam myself. Just wanted to see who else is using it

Xtnct00WS6

iTrader: (8)

If you have the patriot 243 heads milled with ferrea valves, I STRONGLY encourage you to CHECK PTV clearance with a 228/230 cam. ~150$ worth of tools is a small price to pay for a little insurance to know you're safe. Otherwise that ~150 could be put towards a new shortblock.

kazfan30

iTrader: (18)

What tools did you use that cost 150.00 if you dont mind me asking? Im so aggrevated right now bout all this... Its like if i would have known that ptv was such a problem with this Ferrea valves(more than one person has told me about issues) i would have left the 2.00/1.55 valves in and had cam options out the *** Only reason i chose F11 is because Allan Futral, and Gunnar both said it will fit fine, but any larger(TSP V2,F13,etc) would be getting too close.....makes me sick to have a nice flowing set of heads but have to run such a small cam Thanks for looking out for me though buddy

Oh yeah and you said milled too.....was your heads milled any. Mine are unmilled so would that make a difference

NEVR2ND

iTrader: (10)

Patriot S II milled .010, F13 cam on 113
and no problems so far even after bouncing off the 6800 RPM limiter a few times

Xtnct00WS6

iTrader: (8)

I hear ya Kazfan, I'm with ya on that. To check PTV clearance check this out: https://ls1tech.com/forums/showpost....64&postcount=6

This is what I bought and it's about the best u can get.
http://store.summitracing.com/partde...5&autoview=sku

You'll need to make part of the stand from the previous url to get that kit to work. It's the only one out there that I know of though. It's easy to make with two bolts, a nut and some kinda strong epoxy like JB Weld.

Having unmilled heads makes a HUGE difference. You'll probably want to mill them for higher compression though. You'll be leaving a lot of power on the table with near stock compression.

Mine were only milled .010 btw. Looking back on it I wish I milled more because there is a lot of power to be gained by bumping up the compression. I think it was someone from TEA that did an interesting study showing that a stock 241 casting ported head milled for high compression made more power than a near stock compression aftermarket high dollar head. If the aftermarket head was milled to the same cc's, everyone know's which head would make more power though.

Here's the thread:

https://ls1tech.com/forums/generation-iii-internal-engine/528602-massive-dyno-testing-session-revealed.html

JakeY2KZ

iTrader: (9)

Hmm....just curious but would 5.3 heads with same valve sizes have similar issues. I'm asking b/c I'm running 2.02/1.57 manley valves in mine and wanting to jump up to a slightly bigger cam. As of now I have no clearance issues but want to know how far I can push it. Heads are not milled either and cam is in sig.

kazfan30

iTrader: (18)

I really dont think the valve diameter is the problem.....not sure bout manley valves, but the Ferrea's as pictured above sit .040 deeper into the chamber=less clearance.