My 72 Grabber in 2 weeks. Any performance predictions?

I will be installing ported 69 Windsor heads with 55cc chambers and 1.94/1.60 valves. (flows about like a out of the box set of Performers) Flat tappet cam with .510/515 lift 230/232 duration 107 lobe sep. Twisted Torquer intake portmatched to heads with Holly 650 DP. It already has full length headders and 2.5 inch exhaust with H-pipe. I am also installing a 9" rear with traction lock and 3.70 gears. It has a C-4 auto. I will be switching to a 5-Speed sooner or later this year too. I am putting this on a 90K mi motor that is in awsome condition. I will be building a 306 over the next year that will have roller cam and alluminum heads.
I am shooting for around 250-300 rear wheel HP with the current motor. And around 400 with the 306.
What do you guys think it will do? I have no idea what the compression will be. Ford installs pistons .019 in the hole for that year so I think it will be somewhere in the 9s.
This car has been nothing but fun so far so I cant wait to see what happens.

 

10 to 1 compression 13.75 1/4 mile?

 

at what altitude?

 

"9s"???? Now THAT's funny...


Anyway, what altitude are you at and will it be running slicks or street tires?

Do you have a plan for putting that power to the pavement?

What you're describing is approximately a 14 seccond ride...

 

Put a little timing in it, get rid of as much weight as you can and if........IF you get it to hook I think high 13's can be accomplished.

 

think he is talking the 8th mile

 

1/8TH mile would probably be in the high 8's to low 9's.

 

I think he means mid 9's in compression , closer to 10 with that chamber volume!

Richard

 

Project Windsor

Was wondering about your heads, my chart shows the C90E heads at 60cc's. Did you have yours milled and checked or buy them with that info supplied? I think it is a good combo you have but to get some fair numbers in 1/8th, I think you may want to go a bit deeper with the rear gears depending on what size tire you have. Compression ratio with flat top pistons should be somewhere in low 9's, seems that if the heads have been milled to obtain 55cc's this would cause a problem with intake alignment among other things. I love the 306 motors that I have run with your projected mods, but found out that they like a lot of timing and need to twist them way up in rpm's to get full potential from them. Course you could always use that add on boost of laughing gas and really get some numbers on the et slip. As a footnote, be sure and check pushrod geometry when installing the heads, this has been a headache for many with certain blocks and cams. Just trying to save you from extra secondary repairs that I found out happen, the hard way. Good luck as always.

 

Good advice Old Guy.

If it were me, and I was building a motor over the winter, I would go 347. Ain't no replacement for displacement.

 

sure this is a replacement for displacement its called Turbos...........to bad I can't seem to be able afford either one stuck with a naturally aspirated 306

 

Sure power adders are nice, but which will make more power with a turbo, a 306 or a 347?

Aint no replacement for displacement!!

 

I meant 9s in compression.
I hope with the cam, heads and 3.70 posi rear it will sneak into the 13s in the 1/4 mile. When I get the 5-Speed in it I will install 4.30 gears and end up with a better final drive than the 3.00s. It will be 2.66 with the .62 overdrive. It will probably be alott faster with the 5-Speed too so maybe 12s since it onely weighs 2800 LBS.

 

oh I forgot to tell ya, OLD GUY. I am thinking of AFR 185s and an Anderson Ford high rev hydrolic roller cam, an N-71 or N-91 The 306 will have all the nessasary strengthening such as stud main girdle and windage tray. Also scored a 70 BOSS 302 crank for it. I am going to use those D.S.S. long rod and piston (1.8:1 ratio) to support the 7200 RPM I may be spinning it to. The altitude will be around 300 FT. Trying to keep it streetable and capable of long drives in the country too. So I think I am going to be a working experiment for the next year or so. I thought about a 331 stroker but was more expensive than the free forged steel BOSS crank.
I got alott of the parts from a friend who used to work for Ford in the glory days and has some stuff left over that he donated to my project. He is the kind of sicko that would (AND HAS!) stuffed a 351 Cleveland in a Pinto.

 

There is a lot more to think about when you go drag racing!

You going to find that out after going a couple of times.

All in all if you can get it to hook and the air is clean you should be high 13's low 14's. With a C-4 you'll need a good stall to get you out of the hole, your 60's foot times will be the factor in how fast you'll end up going 14's or 13's. The rule of thumb is for every tenth of a second you gain in the sixtys you gain another on the top end, now that for 1/4 mile not 1/8 mile.

As long as you don't break anything be happy with whatever time the car gives, and if you win a round or two thats just icing on the cake.


Bossmav