How fast is your CAM only LT1?
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Originally Posted by 96capricemgr
Stock f-body heads are aluminum and NOT superior to the irons matter of fact MOST of the LT1 aluminums flow less than all the irons with only the best aluminums equalling the irons flow. In now way saying swap to the irons just saying the "aluminum is better" thing is old and hard to stamp out ignorance. LT4 parts are talked about like the best things ever BY NEWBIES and magazines, those of us who have been around awhile try to keep this stuff in check but it is hard.
My Aluminum heads are now sitting at 210cc on the intakes ports and flow very well Tha aluminum heads have some very nice benifits. Now take in mind I have been playing with LTx engines for over ten years now.
as with any aluminum head you get to run More CR then Iron all things being equal. The wiegh less and every pound counts. Have have a better potential for modification then the iron heads, most times you grind through a wal on iron heads you are starting over. With aluminum you just weld it up
I do agree the LT4 stuff is over rated. Unless you are going big Cubes and Big HP. Then you still need a highly modified intake to feed it.
when my engine was bone stock with only a Flowmaster muffler I bolted on an ATI kit and ran 12.6s consistant. I went 12 rounds one day with a 12.61 dial
this was at 9Psi and no tuning. then again we did not have tuning tools back then Best bang for the buck parts are ported stock heads and a hot cam kit with headers and a CAI.this can all be done for just over $2,000 if you do your own work
IF you are going to add a blower pull the engine and put forged pistons in it now
with the age of the cars now it is just the wise thing to do. good pistons and a custom cam with supporting valve train into decent headers and a daily driven 11 second car will be your.Good luck!
The aluminums do have advantages they are just not magically superior as most seem to believe and most site the one major DISADVANTAGE as an advanatage I just want people to understand what is going on rather than keep believing a bad thing is good( the heat disapation is wasted energy period not that the compression and weight reduction can't overcome it). I am actually working on getting a set of aluminums for my car but that is because my porter of choice has not done any R&D on the irons largely due the IGNORANCE that surrounds them and the resulting lack of demand. As far as 210 ports on LT1 casting at that point might as well use the LT4s also I think most would agree that too large a port for a 350 would be great for a stroker though especially if looking to spin past 6K.
All goes well and sunday I will crack into the 12s in a full weight b-body with just a cam,rockers, and springs in the motor and with mild 2800/3.42 so I am not doing too bad myself even if I have only 5 years of LT1 research and play under my belt.
The irons are so bad
that another b-body just broke into the 10s with ported iron heads a cam and spray on a stock bottomend. http://dan.esteban.com/impalass/ReturnTopET.asp see number 13 and 15 same guy same car just the SLOWER run is with the stroker with AFR LT4s. Not saying the irons are better or the best or anything just think they deserve substantially more credit than they get. We are very lucky a few of the b-body guys maintain such a page for us it is a great research tool anything similar for f-bodies? My current bests times are at down at position 141 and as noted I think I can get more out of it.
All goes well and sunday I will crack into the 12s in a full weight b-body with just a cam,rockers, and springs in the motor and with mild 2800/3.42 so I am not doing too bad myself even if I have only 5 years of LT1 research and play under my belt.
The irons are so bad
that another b-body just broke into the 10s with ported iron heads a cam and spray on a stock bottomend. http://dan.esteban.com/impalass/ReturnTopET.asp see number 13 and 15 same guy same car just the SLOWER run is with the stroker with AFR LT4s. Not saying the irons are better or the best or anything just think they deserve substantially more credit than they get. We are very lucky a few of the b-body guys maintain such a page for us it is a great research tool anything similar for f-bodies? My current bests times are at down at position 141 and as noted I think I can get more out of it. Well the plan was something like this.
The motor in the car im starting with has literly... 20 miles on it. It is brand new.
So im going to run it untill the three year warrenty is out.
Then im pulling the motor. I will go with a full forged bottom end running about 8.5:1 compression with LT4 heads and intake. Don't forget the gapless rings. Cam will be whatever the cam manufacturer suggests. The heads will be flow benched with all the ports matching. Then some sort of supercharging or turbo. I think with 8.5:1 compression i could get away with 15 psi lbs. That should make for a real stout motor making AWESOME POWER. What you guys think im looking at for power?
The motor in the car im starting with has literly... 20 miles on it. It is brand new.
So im going to run it untill the three year warrenty is out.
Then im pulling the motor. I will go with a full forged bottom end running about 8.5:1 compression with LT4 heads and intake. Don't forget the gapless rings. Cam will be whatever the cam manufacturer suggests. The heads will be flow benched with all the ports matching. Then some sort of supercharging or turbo. I think with 8.5:1 compression i could get away with 15 psi lbs. That should make for a real stout motor making AWESOME POWER. What you guys think im looking at for power?
Originally Posted by TwoFast4Lv
Well it is not that they are bad head. The question for most of us is why take the penalties for the same performance
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Originally Posted by AnthonyConstant
so your saying a cam on a stock z will put you in the 12s?
Daren
A page or two back I believe I detailed the way I did things in the wrong order, cam only my best was 14.9 the car has since gone 13.2on slicks 13.6 on street tires and tomorrow I seek to better that, My gears and stall are very mild too at 3.42 and 2800, more gear and stall would certainly be daily driver tolerable this setup was aimed at 20K+ a year with "family" roadtrips to the east coast in mind.
There are several bolton b-bodies in the 12s lightening bigger stalls more gear, one even has a shot at 11s NA if he gets the right weather that car is often trailer to the track though were tomorrow I will be driving 120miles each way to run full weight and then maybe shed a few pounds. You just have to keep the details in mind when comparing setups.
Also I am getting 13.2 at just 101mph this chassis and the 28X10.50 ET drags I am running allow me to pretty fully use the torque I am making most other cars at this ET will be going a higher mph.
There are several bolton b-bodies in the 12s lightening bigger stalls more gear, one even has a shot at 11s NA if he gets the right weather that car is often trailer to the track though were tomorrow I will be driving 120miles each way to run full weight and then maybe shed a few pounds. You just have to keep the details in mind when comparing setups.
Also I am getting 13.2 at just 101mph this chassis and the 28X10.50 ET drags I am running allow me to pretty fully use the torque I am making most other cars at this ET will be going a higher mph.
10 Second Club
Joined: Aug 2008
Posts: 14
Likes: 0
From: tupelo mississippi
I have a 97 z28 with a .530 cc LT's. True duals 2500 stall 52mm throtle body RR's ported stock heads lt4 km 100 homemade wet shot with mickey et streets my best time is 1.52 60' 6.72 1/8
Teching In
Joined: May 2007
Posts: 23
Likes: 0
From: off center
My car wet 13.30 at 105 mph as delivered from GM.
It went 13.001 at 106mph with 4.10s.
It went 12.89 at 111mph with hotcam and gears only, no tune, street tires.
It went 12.38 at 115 with drag radials, headers, and mail order tune added to the above.
The best 1/8th so far has been 7.87 at 90mph with a 1.76 60'.
If I could get it to 60 foot it'll go high 11s. 100k miles and the heads have never been off the car...but they are the over-rated LT4 heads though
Its had this cam for over 30k miles and get driven regularly. It still gets 25mpg hwy
It went 13.001 at 106mph with 4.10s.
It went 12.89 at 111mph with hotcam and gears only, no tune, street tires.
It went 12.38 at 115 with drag radials, headers, and mail order tune added to the above.
The best 1/8th so far has been 7.87 at 90mph with a 1.76 60'.
If I could get it to 60 foot it'll go high 11s. 100k miles and the heads have never been off the car...but they are the over-rated LT4 heads though
Its had this cam for over 30k miles and get driven regularly. It still gets 25mpg hwy
