Looking for criticism/tips on the upcoming combo I have planned. I'm only 20 so I could use some help from you old guys http://www.camaros.net/forum/smile.gif jk....Here it is:

355- rebuilt bottem end with Hyper pistons 10.3 Compression Pro Topline Iron Lightning Heads 200cc 64cc chambers 2.08/1.6 valves(enginekits.com)
World Sportsman Dual Plane Intake(may switch to Air Gap or plain old RPM) I have a holley 650Dp and a 750VS 1.5 Roller Rockers MSD everything 1 5/8 Headers to 2 1/2 exhaust dumped at rearend

Rounded down Cam choice to two(both FT solids): Comp XS274 274/280 236/240 .501/.510 Lift (.485/.494 w/ lash) 110LSA
&
Lunati 278/288 239/249 .517/.543 Lift(.499/.523 w/ lash)-will get custom ground to 110Lsa

Which cam? Both will be installed straight up at 110...the XS274 will give me a DCR of 8.1 and the Lunati 7.99. I like the bigger split of the Lunati with the larger intake valves(2.08) of the heads to get the exhaust flow comparable to the intake. Comments?

This will be going in a 81Z28, approx. 3500lbs with Tremec Tko 5-speed manual and 3.42 rearend....high 12s possible with Nitto Drag Radials? This car is a true daily driver(20 miles+ a day) but only 2 months out of the year so i can live with something borderline 'streetable'but would like at least 12mpg.

All help is appreciated, thanks guys! I look forward to being part of your crew!

Has anyone tested those pro topline heads sold from enginekits? Do they flow the same numbers as the standered pro actions? I mean why put big valves in if you dont unshroud them and pocket port them? Are the 1 offs or factory rejects? Has anyone bought those heads from enginekits? combo looks good, i dont know about the split pattern cam, pro topline is said to flow better numbers on the exhaust then posted.

I don't have any flow numbers but i know someone who is using these same exact heads from enginekits.com in a 350 with a 232/232 107 hydraulic wolverine cam(seems like an older grind to me)and without a lot of tuning he is running 8.6 in the 1/8 with a crappy 2.1 60ft time(this is with a heavey 2nd gen camaro)...translates to a 13.4 or so 1/.4 mile and could prolly reach 12s with a good 60ft time and some tuning...

I may flow test my heads if it doesnt cost that much to help other people out but I am not 100% sure.

[This message has been edited by AllGoNoShow (edited 01-19-2003).]

I'd go with the 180cc heads and enjoy the extra power and torque. According to the flow numbers listed at Pro Cylinder Heads, the 180's actually flow 4% more average on the intake up to .500 lift, while the exhaust flow is the same. Using the smaller, more efficient head will give you torque all across the range of the motor.

------------------
1967 Nova coupe daily driver
406, 10:1, 224° cam, Q-jet, 700R4, 3465# w/driver
11.75 @ 117 thru the mufflers
18 mpg on the road

I agree too, with the 180's, you have to remember that enginekit charges shipping and you will probally have to exchange out those roller springs for a flat tappet cam. That cost alone out weighs summit with the right springs and more. If you run those springs you run a huge risk of a flat cam. save a few bucks and risk it or do it right and spend 50 bucks more???

I'm buying the 200cc Heads cuase they are the only ones offered in 64cc chamber to give me the compression I want, the 180cc are only in 72cc Chambers(at enginekits.com). As for the valve srings they are not intended for roller cams and are not dual springs like they say in a couple spots on their website...if you download their catalog and/or talk to them on the phone they are in fact single springs with 130 seat pressure, i forgot open pressure but i think its in the 290, maybe more range which is a good match up for a solid cam or serious hydraulic...and also Summit does not offer the Pro Topline Heads anymore, they are discountined for time being, I don't know why...they have some left over but none in the 180cc or 200cc configurations....

I know the cylinder Heads are slightly overkill but i plan on using these heads on a 383 or 406 down the road. I'm not worried about losing a few pds of torque seeing that I can't get the car to hook now with world s/r heads and a 204/214 cam!...any other comments on the combo?! Thanks guys!

[This message has been edited by AllGoNoShow (edited 01-19-2003).]

The 2.08" valve is a little excessive for this application as well.

What about a crate motor? You'll have at least as much in all the parts that you want to buy and what about labor? Machine work cost? With GM you get a guarantee as well. The 350HO that I picked up is great. Wasn't real expensive, good streetable compression and it moves my 69 down the road nicely. But, the best thing is that if it breaks, it goes back to the General.

------------------
1969, X-44, Export Model, Hugger Orange, Std. Int., BT 12 bolt, PDB, GMPP 350HO, M22 Supercase, SSM Lift Bars, AirGap, Holley 750, FlowMaster American Thunder Exhaust, FlowTech Headers, 15X7 Ralleys

Why the 64cc iron heads? With over 10:1 static compression and 8.0:1 DCR you are pushing it, I'd either go with 72cc chambers for iron heads (drops your CR to 9.5:1) or go with aluminum heads. I like the Comp cam choice, but with 8.0 DCR & iron heads you are pushing it.

I'd go with 9.5:1 static, iron 72cc heads, and the Comp XS274. OR go with the aluminum heads 10.2:1 static CR, and the comp XS274.

Looks like a good combo to me.

ps. I also like the looks of the 180cc runners, you'll make more average HP that way.

[This message has been edited by Eric68 (edited 01-20-2003).]

ditto on the 180cc runners. I've got them on my 355. http://www.camaros.net/forum/biggrin.gif

The Heads are already bought some I'm stuck with em http://www.camaros.net/forum/smile.gif

I didn't want to get 72cc chambers because I want to cover all my bases and just in case the steel shim gasket from fel-pro does not seal I want to be able to still get a decent compression with a composition....If i went with the 72cc and the steel shim did not seal correctly I would be stuck with about 8.9 compression or so...I know the 200cc are a little excessive but it seems a lot of people are running trick flows and AFRs on even mild 350s and this is only 5cc more intake ports...and while my DCR will be up there I live In upstate NY where my car never sees above 190 degrees temp., even on the hottest day, and if i do use the steel shim gasket i get a quench of .04 which should help prevent detonation...I Might actually polish the chambers and take a couple ccs off so my compression isn't quite as high..or i could use a slightly thicker steel shim gasket get 10.15 or so SC but then a worse quench at .45....so do you think the COmp. cam is a better pick in this instance? any other cam recommendations? Thanks for the comments guys...keep em coming!

PS- I know of someone who is running a very similiar combo with no problems with detonation-10.2 compression/7.99DCR 278/288 cam with Iron Vortecs

[This message has been edited by AllGoNoShow (edited 01-20-2003).]

I like the combo. You might be borderline dtonation with the 64 cc's, but I woul bet you will be o.k. If not it is easy to bump the compression down with a simple gasket change, or better yet taking a few cc's of out by unshrouding the valves. Both are easy and cheap solutions. I have personally run 64 cc heads on two 350s with flattops and no problems, however I don't know the piston to deck clearence so I don't know the exact CR.

I like the Lunati gring but it would be pretty wild on the street. Good luck.

From what I've heard the Pro Topline Heads are a couple ccs more then what they claim so I may come in around 10.1 compression or so...I'm going to CC them just to be certain...as for cams I'm gonna throw in another one that I really like...its an Ultradyne solid 275/280 239/247@.05 .510/.525(.494/.499 w/ lash)110LSA What do you guys think?Seems a tad big for a dialy driver but I can live with something borderline 'streetable'

On my old 383, I had ported Sportsman II's with the 200cc runners, and Comp 294s soild (294 adv, 248@.050 with the 1.6 rockers, .560 lift, 110 LSA) and ran it everyday. Compression with the 64cc heads cam to 10.7:1, ran 14 degrees initial, 36 total and 93 octane...two years, no problems.

Actually sold motor to another guy who will drive it occasionally.
New 406 is 11:1, but, has aluminum heads...but same solid cam, and is also a daily driver.
I think the Lunati cam is fine........

------------------
406, Dart Pro 1 aluminum heads, Comp 294s solid,Eagle rotating assembly with 6.0" rods,JE forged pistons,Edelbrock RPM intake with Holley 750 HP, all MSD ignition

My flat top 355 with the 200cc Sportman's 64cc heads has a CR of 9.75:1 - with the XE284 Comp Cam. No problems what so ever on 93 octane fuel.