I have a 84 t-type. I used a 73 block with a 70 rotating assembly. 68 stage 1 400 heads with bowl work and light porting and I'm using 68 1.6 rockers. I feel like I have to stay around .500 lift because my valve train is factory 68 parts and aftermarket valve springs. I have a lunati 33302 cam. It's 224/234 at .050. .480/.503 lift. 112 lobe separation. 1 7/8 ta headers. poston intake which I plan to change to a performer. and a 3.73 posi. carb 850 barry grant. and a MsD. and a 200r4 with mods and a 2400 stall. I should be around 11 to 1 which I think would make the cam too small. it left hard and ran a dull 14.0 @97mph. I would like to put the biggest cam I can without killing the valve train as I am very poor. Also I use kenne bell adjustable pushrods. My thinking was somewhere around 250@50 and a .500 lift not sure about the lobe centers. These parts were contributed by my dad would appreciate any input. I want to run 12s. Katie Bible
Katie, I don't know how you come up with 11 to 1 compression with stock 70 pistons in a 73 block. Even with 68 heads, at best you might have 9.5 to 9.7 to 1 compression, unless you have decked the blocked about .050 or more. If you go to a cam with 250 degrees duration at .050, your torque convertr will be WAY too small, as that cam would want to idle at around 1000, rpm. You are basically wanting to knock over 1 full second off that car, a cam change is not going to do it. Of course you did not give any particulars of the car, like 60 foot times. At 97 mph, you should be well into the 13's. You say the car leaves good? How good? Lots of wheel spin? What altitude are you at? Other than headers, what is the rest of the exhaust system? Jim Burek P.A.E. ENTERPRISES
cam I have 3 1/2 exhaust with a crossover and warlock mufflers. This is a standard block with factory 1970 10 1/4 pistons. Are you saying we should have decked the block with the factory piston? Is there a higher deck heighth on 73 block? Heads are 68 heads with .080 milled. The 400 that these heads were on was super motor. We were considering a hemi killer. We would appreciate any any input. Thank you very much for your time. We have run buicks in a while. Just trying to catch up. Katie Bible and dad
All deck heigths are roughly the same, most (if not all) factory setups need about 0.050" milled off for zero deck.
Don't forget to check you're piston to valve clearance as you vary the deck height and/or use a larger cam. Good luck. Ray :TU:
undefinedhey guys my dads a ford guy he wants to know if they ofer the other firing order for buicks GM nascar started using it in 85 takes stress of 2 and four mains and the crankwe have put them in chivy roller motors for some time now and chevy is now doing so so can i get it for a buick :beer :beer
Nothing is available in a flat tappet cam.The 4-7 or4-7-2-3 would require custom cam cores.I am having cores made for the new block that are 55mm roller cams that have the swaps but nothing for a flat tappet.sorry
Have you considered buying a set of TA alumunum heads? Those here that have dynoed a lot of engines here say right out of the box without porting they will add another 50-60 hp. Since you now have small valve heads if you had some work done to them you may get considerably more than 50-60hp. They will also help you to be able to run more compression relative to iron heads and still run pump gas on the street.
