Just wanted to get others thoughts on a cam that I was suggested. I reached out to both Cam Motion and Texas Speed for recommendations on a camshaft. The following is what was sent to each:

"Looking to get a recommendation on a cam for my build. I'm currently putting together an LQ4 block that will have a 408 stroker kit installed, running 11.5:1 cr to keep it on pump gas. Still looking at cylinder heads but will be running something like the TFS 225 or PRC 227 heads from Teas speed. I would be interested on hearing a cylinder head recommendation, if you can make one. Motor will be going into a 3100lb m6 car with 3.73 gearing. The goal is a reliable HP for the street somewhere in the 550-600 neighborhood on pump gas with enough vacuum for factory power brakes. Would you you be able to recommend a cam that would work well with the suggested heads? I am willing to sacrifice some top end power for more under the curve and crisp throttle response. Please let me know if there is any additional information you might need. Thanks"

Bobbie with Cam Motion suggested the following:
242/250 Duration @ .050''
114 LSA, 111 ICL (114+4)
.621''/.604'' Lift with 1.7 rockers

I have not heard back from Texas Speed yet, but I think they are at an event this week.

I am still looking at all the different cylinder heads. This is absolutely a street car first with maybe an occasional run on the autocross. There are so many good heads out there that seem to perform very closely to one another, even within the same brand at different port volumes.

Give me your opinion on the suggested cam and any other cams you think might be suitable for my application. Also any cylinder head suggestions would be great.

 

I like the Cam Motion suggestion. I'd run it



Here's my version, based on a Doug Herbert mild solid roller 240/250 I ran in a SBC stroker. I would probably be brave (dumb) enough to try in my planned LS2 cathedral headed stroker.

240/250 Duration @ .050''
113 LSA, 111 ICL (113+3)
.62x'/.60x'' Lift with 1.7 rockers

 

I have prc 225s and 11.4 compression, I have a cam motion 236/245 112+3 cam for my 408 and so far at 6000ft my best is 11.3 with way more to go once I dial in the 60. Drives perfectly fine. Was having some surging issues with tr55 plugs at factory gap. I put colder plugs in it and it smoothed out. I could daily it if I wanted and makes plenty of power. Based on this, your experience with that cam should basically be the same.

 

Damn that's pretty similar. I'm still trying to absorb as much as possible about all the different cams specs and how they change engine operation. The duration numbers seemed pretty high based on what I know so I wasn't really sure how the would effect idle and throttle response/power. When I plug the suggested cam numbers into a calculator, I get a DCR of 9.1:1 with a static CR of 11.48:1. Based on what I've rear, the DCR would be a little high for 93 pump gas.

Cylinder Bore (inches): 4.030"
Stroke (inches): 4"
Cylinder Head Chamber Volume (CC's): 67cc
Piston Dish/Dome (CC's): -3cc (enter negative # for dome)
Head Gasket Thickness (inches): .051 (.038 is a typical value)
Head Gasket Bore (inches): 4.20"
Deck Clearance (inches): 0.020"(.020 is a typical value)
Connecting Rod Length (inches): 6.125"
IVC @ .050": 51

 

Awesome man, thanks. Those or the PRC 237's are what I've been looking at, of course there so many other well performing heads also. Haveyou had it on a dyno? Curious what the number are?

 

Don't see it reaching 550-600rwhp without a really good induction system, larger heads and camshaft. My 01 which runs on 93 octane is only putting down 540 rwhp naturally aspirated.

 

Which calculator is that?

 

489/430

 

Summit's, courtesy of Cam Motion

 

My new 403 which I’m going to post a build thread up soon has a set of trickflow 235s that have been hand ported/blended and Milled, about same compression as you and I got a pat g spec’d cam with is very similar to cam motion 245/250 113+4

 

Email is the wrong venue to actually discuss the cam I suspect..
There needs to be a conversation.. How your going to drive it,, and all that jazz.

 

Bobby knows his stuff. He's young but cams are his specialty and he knows them very well and knows just about every combination out there. But without an exact set of heads for him to dial in on, He's just giving a best case scenario cam.
As for heads, it seems you're on somewhat of a budget to whereas maybe Frankenstein or equivalent would be too far out. There are a lot of great heads out there but like mentioned above, induction is gonna be key in attaining your hp goal.

 

Thanks. As far as heads go, I dont won't to go crazy but sub 3k budget is not out of the question. Not sure on the Frakenstein heads, but I'll take a look. As for some others that have mentioned induction, it'll be a Fast 102 I take and 102 tb.

 

The FAST 102 LSXr and the NW 102 are excellent choices.

 

Many good choices out there. Depends on what you want. If I had to do it over I would swing for mast small bore ls3s with lightweight valves and a modified ls3 intake. Or the more conventional safe approach would be ported ls6 heads. As casts or cnc aftermarket which will be close to one another.

No shame in going with cheaper ported or as casts. They will perform nearly identical to the cnc counterparts at the track where it matters. So far I got a best of 11.3 in a full weight car with 6000 ft of air and geared for a nitrous pass. Hitting traps at under 6k rpm and haven't nailed 60 down. Ya. As casts work fine for what they are.