302 build

89Gmcsierra · Posted: Mon Jan 27, 2014 2:14 am Post subject: 302 build

i just bought a 1980 mercury Capri
has 306, Roush 200 heads, roller rockers very mild camshaft. Torker 289 intake, 600 edelbrock MSD 6a box 10.5:1 compression what im told, Keith black forged flat tops. and factory crank and rods.

I wish to get more power. what would be best bang for my buck, camshaft and intake i want to switch. also non roller block.

SMOKEmUP · Posted: Mon Jan 27, 2014 2:32 am Post subject:

Put a 5.3 ls motor in it.

clay · Posted: Mon Jan 27, 2014 11:09 am Post subject:

How drivable do you want it to be? If you can change converter / gear to make it work more rpms would be my approach for outright power. However with the lack of displacement it could become a turd in a hurry. Clay

Big Dave · Posted: Mon Jan 27, 2014 11:40 am Post subject:

I agree with Clay's assessment. Chevy built a five liter race car for the public, but if you have ever watched an owner of a restored Z/28 (not a Z/28 with a 454 motor installed) trying to park his car at a car show you will get an idea of what Clay is talking about.

The 302 had a high rise dual plane intake topped with an 800 cfm Holley. The problem is with the 30/30 solid tappet Duntov cam that ran fine up to 10,000 RPM (peak power was at 7,800 RPM) but also required a 4.11 rear gear to enable the car to be driven on the street.

A dual purpose race car and street car requires a five to a seven liter EFI Chevy LS-x motor if you are trying to put an engine in a GM car. If you have a FOMOCO car then you need a V-8 (or V-10) modular motor with a four valve head and of course EFI. EFI utilizes a computer that monitors the motor 16,000 times a second to keep everything running optimally. It allows Mr. Jekyll and Mr. Hyde to occupy the same body simultaneously.

Big Dave

89Gmcsierra · Posted: Mon Jan 27, 2014 11:54 am Post subject:

I just want weekend car for the track 12s I would be happy with. Was looking @ 4:11 284hr cam and 4500 stall has c4 tranny. Not sure for carb.

Paul P · Posted: Mon Jan 27, 2014 1:21 pm Post subject:

Your plan looks ok with cam and gears. I would look into porting the heads, lighten the car as much as possible and you might get there with what you have. Do put a Holley carb on it too.

SMOKEmUP · Posted: Mon Jan 27, 2014 5:29 pm Post subject:

Before you start throwing hard parts at it get a wideband O2 with a datalogger and get a baseline. Gears, converter, and tires will give you the most bang for your buck. Those cars are pretty light and I'd think 12s should be very doable.

89Gmcsierra · Posted: Sat Feb 01, 2014 4:09 pm Post subject:

I've been talking to a mustang guru that also runs a 306, he's running 1/8th mile in the 5's. telling me 4:10 good stall good tires. upr suspension i shouldnt have to touch that engine for 12's. so right now going for suspension and gears first. maybe by the end of this year open the motor.

af2 · Posted: Sat Feb 01, 2014 8:02 pm Post subject:

89Gmcsierra · Posted: Sat Feb 01, 2014 8:10 pm Post subject:

https://www.youtube.com/watch?v=gbyFd3ol7p0
this is 1st 250 shot he ran.

af2 · Posted: Sat Feb 01, 2014 10:04 pm Post subject:

That is what I was saying...

William Jones · Posted: Wed Feb 12, 2014 4:47 pm Post subject:

12s will be no problem when you get what you have already sorted out and get it to hook. My sons car runs 7.30's in the 1/8 with a powerglide and 4.30 gears and a 29.5 tire. The engine is A stock short block with A F cam and trick flow heads. It has gone 11.70s in the 1/5.

Bam

89Gmcsierra · Posted: Mon Apr 14, 2014 8:54 pm Post subject:

anyone have any idea how much clearance i have for camshaft. cams screwed. it has no valve reliefs in the pistons. i would like to put a solid cam go away from hydraulic. any ideas for cam?

SMOKEmUP · Posted: Wed Apr 23, 2014 10:43 am Post subject:

From what I've read anything above 0.500" lift and you could run into trouble. Best thing is to check it.

89Gmcsierra · Posted: Wed Apr 23, 2014 1:27 pm Post subject:

This is cam comp said to run im scared its too big.

Exh .564 int .555
exh 250 int 244 duration @ .050